sensor JAGUAR XFR 2010 1.G Workshop Manual

Seating - Seats - Overview
Description and Operation

OVERVIEW

Leather Seat Covers Published: 20-Nov-2013

Leather is a natural product, therefore it bears natural characteristics, such as grain variations, growth & bush marks. These
non-weakening marks show the true nature of the hide and are the hallmarks of Leather. In order to maintain the beauty of the
vehicles natural Leather upholstery it requires regular cleaning, which if neglected, may cause deterioration. Where dust and
dirt are allowed to accumulate and become ingrained in the surface of the Leather, the upholstery may become permanently
damaged.

Light coloured upholstery can be particularly susceptible to soiling and staining and care should be taken to ensure that where
there is evidence of any soiling or staining on the upholstery then this should be cleaned immediately using the Jaguar/Land
Rover approved products, failure to do this could lead to the stain becoming permanent, this applies to all leather upholstery
and is not colour specific.

Leather trimmed seats will naturally exhibit areas of creasing and wrinkling over a period of time and is a normal characteristic
as the Leather ages.

Particular care should be taken where there is evidence of soiling or staining on the leather, this should be cleaned
immediately. Failure to do this could lead to the stain becoming permanent.
Particular care should be taken to prevent damage from studs, zips and buckles.
NOTES:

Please refer to Leather care label attached to seats for more information.


Creasing and wrinkling does not represent a manufacturing defect.


Damage from studs, zips and buckles do not represent manufacturing defects.


Use only Jaguar/Land Rover approved products in accordance with the instructions for use.

General

A number of front seating options are available. An 8-way electrically adjustable driver's seat is complemented by an 8-way
electrically adjustable passenger seat. A 10-way electrically adjustable driver's seat is complemented by an 10-way electrically
adjustable front passenger seat. A 16-way electrically adjustable driver's seat is complemented by a 12-way electrically
adjustable front passenger seat.

On non-memory seats, the operation of the seats is controlled directly from the driver's seat switchpack. On memory seats,
the operation of the seat motors is controlled by a seat control module which is located on the underside of the driver's seat
frame.

The driver's seat is fitted with a seat position sensor which is located on the seat rail. The sensor is used by the RCM
(restraints control module) to determine the seat position and adjust the inflation time of the airbag deployment accordingly.
Refer to: Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) (501-20B Supplemental Restraint System, Description and Operation).

7 Front seat climate control module 8 Passenger seat squab climate module 9 Drivers seat cushion climate module 10 Passenger seat cushion climate module 11 Drivers seat squab climate module 12 Passenger seat cushion heater element 13 Passenger seat squab heater element 14 Drivers seat cushion heater element 15 Drivers seat squab heater element 16 CJB


HEATED SEATS - OPERATION

Heated Front Seats System Operation

The TSD receives a fused power supply from the RJB. One of the 3 seat heat temperature selections made by the driver or passenger using the TSD soft keys are passed from the TSD on the MOST ring to the Information and Entertainment module.
The information and entertainment module processes the information and transmits the request on the medium speed CAN bus to the ATC module.
The cushion heaters have a thermal sensor which supplies a feed back signal back to the CJB. The squab heater elements do not have a thermal sensor and are maintained at the same temperature as the seat cushion elements.

The ATC module reacts to the driver request information received from the information and entertainment module and requests the CJB to activate the seat heaters. The CJB measures the returned temperature signals from the thermal sensors and relays the temperature signals back to the ATC module. The ATC module then uses the measured seat element temperatures to provide closed-loop control of the heater elements to maintain the temperature at one the 3 heat ranges selected.


NOTE: To prevent excessive battery discharge, the heated front seats will only operate when the engine is running.

Heated and Cooled Front Seats

The TSD receives a fused power supply from the RJB. Selections made by the driver using the TSD soft keys are passed from the TSD on the MOST ring to the Information and Entertainment module. The information and entertainment module processes
the information and transmits the request on the medium speed CAN bus to the front seat climate control module. The front seat climate control module is located beneath the RH (right-hand) front seat, on the floor cross member.

The front seat climate control module receives its power supplies from the CJB. Heating and cooling requests are generated using the soft buttons on the TSD. These requests are transmitted to the information and entertainment module over the
MOST ring. The Information and Entertainment module forwards these requests to the front seat climate control module over
the medium speed CAN bus.
The front seat climate control module supplies power to the two climate modules in each seat. The temperature sensor in each
climate module is monitored by the front seat climate control module which uses the temperature information to control the
Peltier cells accordingly and also the blower fans to distribute the heated or cooled air.


NOTE: To prevent excessive battery discharge, the heated and cooled front seats will only operate when the engine is
running.
Electric Driver's Seat Adjustment - Non-Memory Seats

The CJB supplies 3 power supplies to the driver's seat switchpack. The fused supplies provide power for the seat height and squab recline, the seat slide and seat tilt and the lumbar adjustment respectively. The CJB only provides the power to the driver's seat switch pack when the ignition is on (power mode 6).

For the seat movement motors, when the applicable switch is operated, the power is supplied to the applicable side of the
motor and the ground path is completed to operate the motor in the required direction. To move the motor in the opposite
direction the polarity is reversed.

For the lumbar adjustment, when the switch is operated in the inflate position, power is supplied to the pump motor to inflate
the lumbar support. When the switch is operated in the opposite direction, the power energizes a solenoid which in turn opens
a valve to deflate the lumbar support.
Electric Passenger Seat Adjustment ( 8, 10 and 12 way)

The CJB supplies 3 power supplies to the passenger seat switchpack. The fused supplies provide power for the seat height and squab recline, the seat slide and seat tilt and the head restraint and lumbar adjustment respectively. The CJB only provides the power to the passenger seat switch pack when the ignition is on (power mode 6).

For the seat movement and head restraint motors, when the applicable switch is operated, the power is supplied to the
applicable side of the motor and the ground path is completed to operate the motor in the required direction. To move the

supplies provide power for the movement motors in addition to the driver's seat switch pack. Power is only supplied to the
driver's seat module and the driver's seat switch pack when the ignition is on (power mode 6).

The driver's seat switch pack is connected to the driver's seat module by a LIN bus for the seat movement switches. Any selection for seat movement generates a message which is passed via the LIN to the driver's seat module. The seat module processes the request and operates the applicable seat function as required using the power supplies from the CJB.
Each seat motor contains a Hall position sensor. The sensor sends a feedback signal to the driver's seat module. The signal is
used for memory store and memory recall functions.

The lumbar adjustment switch on the driver's seat switch pack is wired direct to the lumbar pump and solenoids. The switch,
when moved to the inflate position for either the upper or lower inflatable cushion cell, provides a power supply to the lumbar
pump and simultaneously activates the applicable inflate solenoid valve. When the switch is released the pump stops and the
solenoid valve closes trapping the air in the inflatable cushion. When the switch is moved to the deflate position for either the
upper or lower inflatable cushion cell, power is supplied to the applicable deflate solenoid valve which opens to allow the air in
the cushion to escape. When the switch is released, the valve is closed and the remaining air in the cushion is retained.



FRONT SEATS - DESCRIPTION Component Description

The table below highlights the features available for each seating option.

Seat Type Non-Heated Heated Heated and Cooled Lumbar Support Memory 8-way Yes Optional No 2-way No 10-way Yes Optional Optional 2-way Optional (Driver's seat only) 12-way No No Yes 4-way No 16-way No No Yes 4-way Yes (Driver's seat only) Seat Heating

The 3-stage heated front seats feature 2 heater elements located in the seat cushion and a single heater element located in
the seat squab. Operation of the heated front seats is controlled by the ATC module via the TSD, information and entertainment control module and the CJB module on vehicles with heated seats. On vehicles with heated and cooled seats the operation is controlled by the TSD, information and entertainment control module and the front seat climate control
module.

The heated and cooled front seats each contain 2 climate modules; one in the cushion, one in the squab. The climate modules
contain 'Peltier' cells which are able to deliver heating and cooling based on a voltage provided by the front seat climate
control module. Each climate module also contains a fan, which blows air over the Peltier cells to distribute heated or cooled
air via liners in the seat cushion and squab. The fan is also controlled by the front seat climate control module. The TSD allows
the driver and passenger to select 3 ranges of heated or cooled ventilation; off, minimum and intermediate. Also, using the
selections on the TSD, the driver and passenger can select between full seat ventilation or squab backrest ventilation only.

Vehicles fitted with the 3-stage heated front seat option also feature a heated steering wheel.
Refer to: Steering Column Switches (211-05 Steering Column Switches, Description and Operation).
Electric Seat Adjustment

Lumbar Support

On 8, 10 and 12 way seats, a 2 way lumbar support is provided which allows the lumbar inflatable cushion to be inflated or
deflated as required. On 16 way seats, a 4 way lumbar support is fitted which comprises two separate cushion cells. The upper
and lower cells can be inflated or deflated individually allowing greater comfort adjustment for the driver and passenger.

The lumbar support comprises an inflatable cushion located in the seat squab, a pump and solenoids. The pump is activated
when the applicable seat switch is moved to the inflate position, inflating the cell(s) in the inflatable cushion. On 8 and 10
way seats, a single solenoid operated valve allows the inflatable cushion to be deflated. On 12 and 16 way seats, 4 solenoid
valves control the inflation and deflation of the upper and lower inflatable cushion cells, allowing each cell to be adjusted
individually.
Seat Motors

The head restraint motor is located in the upper section of each seat squab and is accessible by removal of the seat back. The
motor moves a cradle which is driven in a vertical motion by a rack and pinion arrangement. The cradle has the two head
restraint stems attached to it and therefore raises and lowers the head restraint as the motor moves the cradle. The motor
contains a Hall sensor which supplies positional information to the driver's seat module.

The seat slide motor is an integral component of the seat frame. The motor drives on a gear on a worm drive lead screw which
is integral with the floor rail. The lead screw has a stop at each end to limit the fore and aft seat movement.

memory positions to be stored and 'set' button with integral LED (light emitting diode). The seat, door mirror and steering
column motors have position sensors which provide feedback to driver's seat module.

Once the driver's seat, steering column and exterior mirrors have been adjusted, the vehicle is able to memorize these
settings for future use by using the following procedure:
Push the memory 'SET' button, the LED in the switch will illuminate Press the memory button 1 or 2 to memorize the current settings. The LED will extinguish, and a chime will sound to confirm that the settings have been memorized. If the ignition is on, power mode 6, the message center will display a
confirmation message.
The positions can be recalled by pressing the applicable button 1 or 2.
Stall Detection

Seat, steering column and mirror motors are deemed to have stalled if there is no change in the inputs that are received from
the corresponding feedback sensors for 200 ms (seat).

If a stall condition is detected then the drive to that motor is cancelled for the remainder of that memory operation (memory
recall) or until the switch is re-selected (manual movement).

If the motor movement has stopped due to loss of sensor feedback, either stall or sensor failure, then that motor may be
activated again, to move past the stall position, by re-selecting the appropriate switch and pressing for longer than 2 seconds.
This allows control of the motor to be maintained if sensor feedback is lost.

Upon re-selection of movement, if sensor pulses are detected then the motor will continue to be driven until the switch is
released or another stall condition is detected. If sensor feedback is not detected then the motor is only driven for 0.5 second
and then stops until the switch is released and then pressed again, when a further 0.5 second of activation is permitted, and
so on, this is known as inch mode.

For all seat motor manual movements, whenever a motor is driven and a stall occurs, the memory control module records the
position at which the stall occurred. If movement occurs beyond a stall position, then that position is erased from the control
modules memory. This will always allow movement past a previously recorded stall position once movement has been
registered beyond that position. This is the case for both manual and memory movement.
Initialization

When a replacement driver's seat module is fitted, it should be calibrated a Jaguar approved diagnostic system so that the
module can learn the seats absolute position.
Battery Monitor

If the battery voltage drops below 10.5 Volts, then the driver's seat module ignores all requests for a memory recall until the
battery voltage has reached 11.5 Volts. This will conserve as much power in the vehicle battery as possible to enable engine
cranking.

REAR SEATS - DESCRIPTION

The rear seat features a single piece cushion and a 60/40 split squab. Two latches are secured to the rear bulkhead by a pair
of M8 bolts to retain the seat squabs in the upright position. The latches can be released to fold down the individual cushions
by pulling a cable release located below the rear window parcel shelf in the luggage compartment.
ISOFIX fastening points are attached to the vehicle floor to provide secure fastening for compatible child seats.

A centrally mounted center arm rest can be folded down from the 60% squab. The arm rest contains two drinks holders.

Symptom Possible Cause Action open circuit Seat movement and memory recall works
correctly however seat lumbar is not
working correctly
NOTE: Seat module
does not control the seat
lumbar function

Seat movement
switch to lumbar
circuits - short,
open circuit Refer to the electrical circuit diagrams and check seat
movement switch to lumbar circuits for short, open
circuit Seat movement from switch pack occurs
in delayed inch mode (seat axis moves
short distance when switch pressed for
longer than 2 seconds and then stops). This behaviour could occur on any seat
axis (slide, height, squab, tilt, headrest
or cushion) when requested
Motor Hall sensor
on affected axis is
not connected or
not receiving
expected signals Check for DTCs, B1B8731, B1B9131, B1B8931, B1B9331,
B106331, B106431. If present then check Hall sensor
feedback circuits between seat motor and seat module
and also check Hall sensor ground circuits for affected
axis. These DTCs are only logged if the axis is
attempted to be moved in both directions. When hall
sensor connection issue fixed press switch on affected
axis for longer than 2 seconds. By keeping the switch
pressed the axis movement should now operate for the
duration of switch-press. Re-calibrate affected seat Seat movement from switch pack occurs
in inch mode. When seat axis movement
is requested from the seat switch pack
the requested seat axis moves a short
distance then stops (does not include
lumbar). This behaviour will occur on ALL
seat axis (slide, height, squab, tilt
headrest and cushion) when requested.
MS CAN communication not possible
MS CAN fault Carry out CAN network integrity test using manufacturer
approved diagnostic system Seat movement from switch pack occurs
in inch mode. When seat axis movement
is requested from the seat switch pack
the requested seat axis moves a short
distance then stops (does not include
lumbar). This behaviour will occur on ALL
seat axis (slide, height, squab, tilt
headrest and cushion) when requested.
MS CAN communication not possible
Seat module is
disconnected from
the CAN Bus Check for Instrument Cluster DTC U020800 'Lost
Communication With Seat Module'. If this DTC is
present, refer to the electrical circuit diagrams and check
seat module power and ground supplies for short, open
circuit. Carry out CAN network integrity tests using the
manufacturer approved diagnostic system Seat movement from switch pack occurs
in inch mode. When seat axis movement
is requested from the seat switch pack
the requested seat axis moves a short
distance then stops (does not include
lumbar). This behaviour will occur on ALL
seat axis (slide, height, squab, tilt
headrest and cushion) when requested.
MS CAN communication not possible
Instrument cluster
is disconnected
from the CAN Bus Check for seat module DTC U015500 'Lost
Communication With Instrument Cluster'. If this DTC is
present, refer to the electrical circuit diagrams and check
instrument cluster power and ground supplies for short,
open circuit. Carry out CAN network integrity tests using
the manufacturer approved diagnostic system Seat movement from switch pack occurs
in inch mode. When seat axis movement
is requested from the seat switch pack
the requested seat axis moves a short
distance then stops (does not include
lumbar). This behaviour will occur on ALL
seat axis (slide, height, squab, tilt
headrest and cushion) when requested.
MS CAN communication not possible
Driver Door Module
is disconnected
from the CAN Bus Check for seat module DTC U019900 'Lost
Communication With Driver Door Module'. If this DTC is
present, refer to the electrical circuit diagrams and check
driver door module power and ground supplies for short,
open circuit. Carry out CAN network integrity tests using
the manufacturer approved diagnostic system Seat movement from switch pack occurs
in inch mode. When seat axis movement
is requested from the seat switch pack
the requested seat axis moves a short
distance then stops (does not include
lumbar). This behaviour will occur on ALL
seat axis (slide, height, squab, tilt
headrest and cushion) when requested.
MS CAN communication not possible
Rear Junction Box
(RJB) is
disconnected from
the CAN Bus Check for seat module DTC U014200 'Lost
Communication With RJB'. If this DTC is present, refer to
the electrical circuit diagrams and check RJB power and
ground supplies for short, open circuit. Carry out CAN
network integrity tests using the manufacturer approved
diagnostic system Seat movement from switch pack occurs
in inch mode. When seat axis movement
is requested from the seat switch pack
the requested seat axis moves a short
distance then stops (does not include
lumbar). This behaviour will occur on ALL
seat axis (slide, height, squab, tilt
headrest and cushion) when requested.
MS CAN communication not possible
Central Junction
Box (CJB) is
disconnected from
the CAN Bus Refer to the electrical circuit diagrams and check CJB
power and ground supplies for short, open circuit. Carry
out CAN network integrity tests using the manufacturer
approved diagnostic system www.JagDocs.com

Driver Seat Module
DTC Description Possible Cause Action B105F11
Seat Cushion
Extension Motor
Output
Driver seat cushion extension
motor circuit - short to ground Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to the electrical circuit diagrams and check driver
seat cushion extension motor circuit for short to ground B105F15
Seat Cushion
Extension Motor
Output
Driver seat cushion extension
motor circuit - short to power,
open circuit Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to the electrical circuit diagrams and check driver
seat cushion extension motor circuit for short to power, open circuit B106011
Seat Headrest Motor
Output
Driver seat headrest motor circuit
- short to ground Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to the electrical circuit diagrams and check driver
seat headrest motor circuit for short to ground B106015
Seat Headrest Motor
Output
Driver seat headrest motor circuit
- short to power, open circuit Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to the electrical circuit diagrams and check driver
seat headrest motor circuit for short to power, open
circuit B106331
Seat Cushion
Extension Motor
Speed/Position
Sensor
Harness/connector problem
No signal from sensor
Sensor/motor malfunction
Check the seat wiring harness/connectors for
security/integrity
Refer to the electrical circuit diagrams and check
the seat cushion motor sensor circuit. Repair
circuit as required. Clear DTC and retest B106431
Seat Headrest Motor
Speed/Position
Sensor
Harness/connector problem
No signal from sensor
Sensor/motor malfunction
Check the seat wiring harness/connectors for
security/integrity
Refer to the electrical circuit diagrams and check
the seat headrest motor sensor circuit. Repair
circuit as required. Clear DTC and retest B106524
Cushion extend
switch
Signal stuck high Check for a stuck switch. Refer to the electrical circuit
diagrams and check driver seat switch pack to seat
module LIN circuit for short, open circuit and cushion
extend circuit for short to ground B106624
Cushion retract
switch
Signal stuck high Check for a stuck switch. Refer to the electrical circuit
diagrams and check driver seat switch pack to seat
module LIN circuit for short, open circuit and cushion
retract circuit for short to ground B106D24 Headrest up switch
Signal stuck high Check for a stuck switch. Refer to the electrical circuit
diagrams and check driver seat switch pack to seat
module LIN circuit for short, open circuit and headrest up circuit for short to ground B106E24
Headrest down
switch
Signal stuck high Check for a stuck switch. Refer to the electrical circuit
diagrams and check driver seat switch pack to seat
module LIN circuit for short, open circuit and headrest
down circuit for short to ground B1A9883 LIN Bus Circuit #1
Value of signal protection
calculation incorrect Check LIN network for interference/EMC related issues B1A9886 LIN Bus Circuit #1
LIN bus Header error Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Check LIN network for interference/EMC related issues B1A9887 LIN Bus Circuit #1
Slave node communication
missing. LIN bus circuit - short to
ground, power, open circuit (ECU
Types 7 & 8) Refer to electrical circuit diagrams and test LIN Bus
between seat switch pack and control module for short
to ground, power, open circuit, check power and ground
supplies to switch pack B1A9888 LIN Bus Circuit #1
Bus off Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to electrical circuit diagrams and test LIN Bus
between seat switch pack and control module for short
to ground or power B1B8611
Seat Height Motor
Relay
Driver seat parallel height motor
circuit - short to ground Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to the electrical circuit diagrams and check driver
seat parallel height motor circuit for short to ground B1B8615
Seat Height Motor
Relay
Driver seat parallel height motor
circuit - short to power, open
circuit Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to the electrical circuit diagrams and check driver
seat parallel height motor circuit for short to power, open circuit

DTC Description Possible Cause Action B1B8731
Seat Height Motor
Speed/Position
Sensor
Harness/connector problem
No signal from sensor
Sensor/motor malfunction
Check the seat wiring harness/connectors for
security/integrity
Refer to the electrical circuit diagrams and check
the seat height motor sensor circuit. Repair
circuit as required. Clear DTC and retest B1B8811
Seat Slide Motor
Relay
Driver seat slide motor circuit -
short to ground Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to the electrical circuit diagrams and check driver
seat slide motor circuit for short to ground B1B8815
Seat Slide Motor
Relay
Driver seat slide motor circuit -
short to power, open circuit Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to the electrical circuit diagrams and check driver
seat slide motor circuit for short to power, open circuit B1B8931
Seat Slide Motor
Speed/Position
Sensor
Harness/connector problem
No signal from sensor
Sensor/motor malfunction
Check the seat wiring harness/connectors for
security/integrity
Refer to the electrical circuit diagrams and check the seat slide motor speed sensor circuit. Repair circuit as required. Clear DTC and retest B1B9011
Seat Tilt Motor
Relay
Driver seat tilt motor circuit -
short to ground Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to the electrical circuit diagrams and check driver
seat tilt motor circuit for short to ground B1B9015
Seat Tilt Motor
Relay
Driver seat tilt motor circuit -
short to power, open circuit Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to the electrical circuit diagrams and check driver
seat tilt motor circuit for short to power, open circuit B1B9131
Seat Tilt Motor
Speed/Position
Sensor
Harness/connector problem
No signal from sensor
Sensor/motor malfunction
Check the seat wiring harness/connectors for
security/integrity
Refer to the electrical circuit diagrams and check
the seat tilt motor speed sensor circuit. Repair
circuit as required. Clear DTC and retest B1B9211
Seat Recline Motor
Relay
Driver seat recline motor circuit -
short to ground Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to the electrical circuit diagrams and check driver
seat recline motor circuit for short to ground B1B9215
Seat Recline Motor
Relay
Driver seat recline motor circuit -
short to power, open circuit Carry out any pinpoint tests associated with this DTC
using the manufacturer approved diagnostic system.
Refer to the electrical circuit diagrams and check driver
seat recline motor circuit for short to power, open
circuit B1B9331
Seat Recline Motor
Speed/Position
Sensor
Harness/connector problem
No signal from sensor
Sensor/motor malfunction
Check the seat wiring harness/connectors for
security/integrity
Refer to the electrical circuit diagrams and check
the seat recline motor speed sensor circuit.
Repair circuit as required. Clear DTC and retest B1B9424
Seat Height Up
Switch
Signal stuck high Check for a stuck switch. Refer to the electrical circuit
diagrams and check driver seat switch pack to seat
module LIN circuit for short, open circuit and seat height up circuit for short to ground B1B9524
Seat Height Down
Switch
Signal stuck high Check for a stuck switch. Refer to the electrical circuit
diagrams and check driver seat switch pack to seat
module LIN circuit for short, open circuit and seat height down circuit for short to ground B1B9624
Seat Slide Forward
Switch
Signal stuck high Check for a stuck switch. Refer to the electrical circuit
diagrams and check driver seat switch pack to seat
module LIN circuit for short, open circuit and seat slide
forward circuit for short to ground B1B9724
Seat Slide Backward
Switch
Signal stuck high Check for a stuck switch. Refer to the electrical circuit
diagrams and check driver seat switch pack to seat
module LIN circuit for short, open circuit and seat slide
backward circuit for short to ground B1B9824 Seat Tilt Up Switch
Signal stuck high Check for a stuck switch. Refer to the electrical circuit
diagrams and check driver seat switch pack to seat
module LIN circuit for short, open circuit and seat tilt up circuit for short to ground B1B9924
Seat Tilt Down
Switch
Signal stuck high Check for a stuck switch. Refer to the electrical circuit
diagrams and check driver seat switch pack to seat
module LIN circuit for short, open circuit and seat tilt
down circuit for short to ground

Seating - Heater Mats
Diagnosis and Testing

Principles of Operation Published: 12-Jun-2013

Heated seats incorporate heater elements in the cushion and the backrest of the seat. Each cushion heater element has a
thermal sensor, which supplies a feedback temperature signal to the related seat heater module. The backrest heater elements
do not have a thermal sensor, and are regulated at the same temperature as the cushion heater elements.

For a detailed description of the seat heater mat, refer to the relevant Description and Operation section in the workshop
manual. REFER to: (501-10)

Seats (Description and Operation),
Seats (Description and Operation),
Seats (Description and Operation).

Inspection and Verification

1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical or electrical damage.
Visual inspection
Mechanical Electrical Seat heater switches condition and installation Fuses
Harnesses and connectors
Seat heater module
Seat heater switches
Seat heater mat
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to
the next step.
4. If the cause is not visually evident, check for Diagnostic Trouble Codes (DTC's) and refer to the DTC Index.
NOTES:


If the control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the
warranty policy and procedures manual (section B1.2), or determine if any prior approval programme is in operation, prior to
the installation of a new module/component.


Generic scan tools may not read the codes listed, or may read only five digit codes. Match the five digits from the scan
tool to the first five digits of the seven digit code listed to identify the fault (the last two digits give additional information
read by the manufacturer approved diagnostic system).


When performing electrical voltage or resistance tests, always use a digital multimeter (DMM) accurate to three decimal
places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads
into account.


Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.


Inspect connectors for signs of water ingress, and pins for damage and/or corrosion.


If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an intermittent concern may be the
cause. Always check for loose connections and corroded terminals.


CAUTION: When probing connectors to take measurements in the course of the pinpoint tests, use the adaptor kit, part
number 3548-1358-00.
DTC Index

For a complete list of all diagnostic trouble codes that could be logged on this vehicle, please refer to section 100-00.
REFER to: Diagnostic Trouble Code (DTC) Index - DTC: Seat Module (Driver/Passenger/Rear Left/Rear Right) (100-00,
Description and Operation) /
Diagnostic Trouble Code (DTC) Index - DTC: Seat Climate Control Module (SCCM) (100-00, Description and Operation).

6. Locate climate seat module, (refer to Electrical Information - Electrical Reference Library, contained in TOPIx) for
guidance on how to gain access to the connector(s)
7. Locate and disconnect relevant connector prior to pin test

8. Using ohm-meter to probe each heat/cooled unit pins (at rear of connector), reading should achieve no greater than 10
ohms after 1 minute (initial fluctuations in readings may occur using ohm-meter, post 1 minute readings will have
stabilized)
Connector and Pin Information
X250 (All Model Years) Terminal ID 1 2 3 4 7 8 9 10 Climate Seat
Unit Location Right
Cushion Right Cushion
Right
Backrest Right
Backrest Left Cushion Left Cushion
Left
Backrest Left Backrest Wiring Colour -
Left Hand
Drive Vehicles GY-BU -
Grey/Blue BU - Blue BU-BN -
Blue/Brown WH - White YE-BU - Yellow/Blue BU-OG -
Blue/Orange GY-VT -
Grey/Violet WH-VT -
White/Violet Wiring Colour -
Right Hand
Drive Vehicles YE-BU - Yellow/Blue BU-OG -
Blue/Orange GY-VT -
Grey/Violet WH-VT -
White/Violet GY-BU -
Grey/Blue BU - Blue BU-BN -
Blue/Brown WH - White
1. If any unit reads greater than 10 ohms, replace only that defective unit

2. If all units read less than 10 ohms but faults are still suspected, do not replace any units. Refer to step 4 below

3. As a final check, when a faulty unit has been identified strip the seat to access unit connector, REFER to: Seats
(501-10, Removal & Installation) and re-check ohm reading to confirm greater than 10 ohms prior to removing unit

4. In cases where the above diagnostic routine does NOT identify a failed unit, please refer to "Over Temperature and
Fluid/Air Leak Diagnostics" below. Also check for any live technical service bulletins referring to the seat climate system

Seat Climate Control Module/Seat Climate Assembly - Further Diagnostics

In the event of suspected climate seat faults use the pinpoint tests detailed below
Connector Checks

First, check the integrity of the three seat climate control module harness connectors:

1. Disconnect each connector
2. Inspect each connector for cracks and breaks, replace as required

3. Check the integrity of connector terminals for bent terminals, backed-out or badly crimped wires. Rectify as required

4. Reconnect all connectors and retest. If seat climate functions are still faulty, note any DTCs that have been logged by
the seat climate control module(s) and refer to the table and pinpoint tests below:


DTC Logged Pinpoint Test Required
NOTE: Where DTCs are marked in bold, this means that there are two possible diagnostic processes that
may be applied to resolve these faults. Check the listings below to reference an alternative set of pinpoint
tests for these DTCs

B10B9-13 Blower Control - Circuit open B10B9-
4B Blower Control - Over temperature B1157-
13 Blower Control B - Circuit open B1157-4B
Blower Control B - Over temperature
B120E-4B Right Thermal Electric Device Control - Over temperature
B1224-4B Left Thermal Electric Device Control - Over temperature
B122A-11 Right Seat Cushion Blower Speed Sensor - Circuit short to ground
B122A-12 Right Seat Cushion Blower Speed Sensor - Circuit short to battery
B122B-11 Right Seat Back Blower Speed Sensor - Circuit short to ground
B122B-12 Right Seat Back Blower Speed Sensor - Circuit short to battery
B122C-11 Left Seat Cushion Blower Speed Sensor - Circuit short to ground
B122C-12 Left Seat Cushion Blower Speed Sensor - Circuit short to battery
B122D-11 Left Seat Back Blower Speed Sensor - Circuit short to ground
B122D-12 Left Seat Back Blower Speed Sensor - Circuit short to battery GO to Pinpoint
Test A.
NOTE: Where DTCs are marked in bold, this means that there are two possible diagnostic processes that
may be applied to resolve these faults. Check the listings below to reference an alternative set of pinpoint
tests for these DTCs
B120E-13 Right Thermal Electric Device Control - Circuit open GO to Pinpoint
Test B.

DTC Logged Pinpoint Test Required B120E-19 Right Thermal Electric Device Control - Circuit current above threshold
B1223-13 Right Seat Cushion Temperature Sensor - Circuit open
B1224-13 Left Thermal Electric Device Control - Circuit open
B1224-19 Left Thermal Electric Device Control - Circuit current above threshold
B1225-13 Right Seat Back Temperature Sensor - Circuit open
B1229-13 Left Seat Back Temperature Sensor - Circuit open
B1235-13 Left Seat Cushion Temperature Sensor - Circuit open
B120F-98 Left Seat Cushion - Component or system over temperature
B122E-98 Right Seat Cushion - Component or system over temperature
B122F-98 Right Seat Back - Component or system over temperature
B1230-98 Left Seat Back - Component or system over temperature
B1231-7A Right Seat - Fluid leak or seal failure
B1232-7A Left Seat - Fluid leak or seal failure GO to Pinpoint
Test C.
NOTE: Where DTCs are marked in bold, this means that there are two possible diagnostic processes that
may be applied to resolve these faults. Check the listings above to reference an alternative set of pinpoint
tests for these DTCs
B120E-4B Right Thermal Electric Device Control - Over temperature
B120E-13 Right Thermal Electric Device Control - Circuit open
B120E-19 Right Thermal Electric Device Control - Circuit current above threshold
B1223-13 Right Seat Cushion Temperature Sensor - Circuit open
B1224-4B Left Thermal Electric Device Control - Over temperature
B1224-13 Left Thermal Electric Device Control - Circuit open
B1224-19 Left Thermal Electric Device Control - Circuit current above threshold
B1225-13 Right Seat Back Temperature Sensor - Circuit open
B1229-13 Left Seat Back Temperature Sensor - Circuit open
B1235-13 Left Seat Cushion Temperature Sensor - Circuit open GO to Pinpoint
Test D.
PINPOINT TEST A : CLIMATE SEATS ASSEMBLY - BLOWER DIAGNOSTICS TEST
CONDITIONS DETAILS/RESULTS/ACTIONS A1: CLIMATE SEATS ASSEMBLY - BLOWER SPEED CONTROL CIRCUIT RESISTANCE CHECKS AT SEAT TO VEHICLE
CONNECTOR 1 Uncouple connector C3HS03C from the seat climate control module 2 Check the resistance of the climate seats blower speed control circuits at connector C3HS03C For right-side seat cushion blower, check resistance at pins 3 and 7
For right-side seat backrest blower, check resistance at pins 4 and 7
For left-side seat cushion blower, check resistance at pins 11 and 15
For left-side seat backrest blower, check resistance at pins 12 and 15 Is the resistance between 290 and 420 kilo-ohms? Yes
No circuit faults present. No further action
No
GO to A2. A2: CLIMATE SEATS ASSEMBLY - BLOWER POWER CIRCUIT RESISTANCE CHECKS AT SEAT CLIMATE ASSEMBLY
CONNECTOR 1 Locate the appropriate seat backrest/seat cushion climate assembly connector 2 Disconnect connector 3 Check the integrity of connector terminals for bent terminals, backed-out or badly crimped wires. Rectify as required 4 Check the resistance of the climate seats blower power circuits at the climate assembly connector, pins 2 and 4 Is the resistance between 290 and 420 kilo-ohms? Yes
GO to A3. No
Replace the seat climate assembly A3: CLIMATE SEATS ASSEMBLY - BLOWER SPEED CONTROL CIRCUIT RESISTANCE CHECKS AT SEAT CLIMATE
ASSEMBLY CONNECTOR 1 Check the resistance of the climate seats blower control circuits at the climate assembly connector, pins 4 and 7