drive transfer JAGUAR XFR 2010 1.G User Guide

TCM (transmission control module) 6 Diagnostic socket 7 Instrument cluster 8 JaguarDrive selector 9 Clockspring 10 Steering wheel audio switches 11 Downshift paddle switch 12 Upshift paddle switch 13 ECM (engine control module)


POWER FLOWS System Operation

Operation of the transmission is controlled by the TCM (transmission control module), which electrically activates various
solenoids to control the transmission gear selection. The sequence of solenoid activation is based on programmed information
in the TCM memory and physical transmission operating conditions such as vehicle speed, throttle position, engine load and JaguarDrive selector position.



Item Description 1 Torque input from engine 2 Torque converter lock-up clutch 3 Single web planetary gear carrier 4 Single web planetary gears 5 Single web sunwheel 1 6 Double web sunwheel 2 7 Double web planetary gears - long 8 Double web planetary gear carrier 9 Double web planetary gears - short 10 Double web sunwheel 3 11 Torque output from transmission A Multiplate clutch B Multiplate clutch C Multiplate brake D Multiplate brake E Multiplate clutch Engine torque is transferred, via operation of single or combinations of clutches to the 2 planetary gear trains. Both gear trains
are controlled by reactionary inputs from brake clutches to produce the 6 forward gears and 1 reverse gear. The ratios are as
follows: www.JagDocs.com

1 Blades 2 Stator held – fluid flow redirected 3 Stator rotates freely 4 Roller 5 Converter at coupling speed 6 Fluid flow from turbine 7 Converter multiplying 8 Fluid flow from impeller 9 Drive from engine 10 Impeller 11 Stator 12 Turbine 13 Output to transmission Fluid emitted from the impeller acts on the turbine. If the turbine is rotating at a slower speed than the fluid from the impeller,
the fluid will be deflected by the turbine blades in the path 'A'. The fluid is directed at and deflected by the stator blades from
path 'B' to path 'C'. This ensures that the fluid is directed back to the pump in the optimum direction. In this condition the
sprag clutch is engaged and the force of the fluid on the stator blades assists the engine in rotating the impeller.

As the rotational speed of the engine and therefore the turbine increases, the direction of the fluid leaving the turbine changes
to path 'D'. The fluid is now directed from the turbine to the opposite side of the stator blades, rotating the stator in the
opposite direction. To prevent the stator from resisting the smooth flow of the fluid from the turbine, the sprag clutch releases,
allowing the stator to rotate freely on its shaft.

When the stator becomes inactive, the torque converter no longer multiplies the engine torque. When the torque converter
reaches this operational condition it ceases to multiply the engine torque and acts solely as a fluid coupling, with the impeller
and the turbine rotating at approximately the same speed.

The stator uses a sprag type, one way, freewheel clutch. When the stator is rotated in a clockwise direction the sprags twist
and are wedged between the inner and outer races. In this condition the sprags transfer the rotation of the outer race to the
inner race which rotates at the same speed. www.JagDocs.com

1 Sprags 2 Inner race 3 Outer race 4 Sprag and cage assembly 5 Sprag outer race 6 Sprag inner race 7 Retaining ring The free wheel clutch can perform three functions; hold the stator stationary, drive the stator and free wheel allowing the
stator to rotate without a drive output. The free wheel clutch used in the ZF 6HP28 transmission is of the sprag type and
comprises an inner and outer race and a sprag and cage assembly. The inner and outer races are pressed into their related
components with which they rotate. The sprag and cage assembly is located between the inner and outer races.

The sprags are located in a cage which is a spring which holds the sprags in the 'wedge' direction and maintains them in
contact with the inner and outer races.

Referring to the illustration, the sprags are designed so that the dimension 'B' is larger than the distance between the inner
and outer race bearing surfaces. When the outer race rotates in a clockwise direction, the sprags twist and the edges across
the dimension 'B' wedge between the races, providing a positive drive through each sprag to the inner race. The dimension 'A'
is smaller than the distance between the inner and outer race bearing surfaces. When the outer race rotates in an
anti-clockwise direction, the dimension 'A' is too small to allow the sprags to wedge between the races, allowing the outer
race to rotate freely.

On the illustration shown, when the outer race is rotated in a clockwise direction, the sprags twist and are 'wedged' between
the inner and outer races. The sprags then transfer the rotation of the outer race to the inner race, which rotates at the same
speed.

Lock-Up Clutch Mechanism

The TCC (torque converter clutch) is hydraulically controlled by an EPRS, which is controlled by the TCM. This allows the torque converter to have three states of operation as follows:
• Fully engaged
• Controlled slip variable engagement
• Fully disengaged.

The TCC is controlled by two hydraulic spool valves located in the valve block. These valves are actuated by pilot pressure supplied via a solenoid valve which is also located in the valve block. The solenoid valve is operated by PWM (pulse width One Way Free Wheel Clutch – Typical

1 Securing ring 2 Shaft oil seal 3 O-ring seal 4 Pump housing 5 Ring gear 6 Crescent spacer 7 Roller bearing 8 Impeller 9 Centering pin 10 Spring washer 11 Outlet port (high pressure) 12 Inlet port (low pressure) The pump comprises a housing, a crescent spacer, an impeller and a ring gear. The housing has inlet and outlet ports to direct
flow and is located in the intermediate plate by a centering pin. The pump action is achieved by the impeller, ring gear and
crescent spacer.

The crescent spacer is fixed in its position by a pin and is located between the ring gear and the impeller. The impeller is
driven by drive from the torque converter hub which is located on a needle roller bearing in the pump housing. The impeller
teeth mesh with those of the ring gear. When the impeller is rotated, the motion is transferred to the ring gear which rotates
in the same direction.

The rotational motion of the ring gear and the impeller collects fluid from the intake port in the spaces between the teeth.
When the teeth reach the crescent spacer, the oil is trapped in the spaces between the teeth and is carried with the rotation
of the gears. The spacer tapers near the outlet port. This reduces the space between the gear teeth causing a build up of fluid
pressure as the oil reaches the outlet port. When the teeth pass the end of the spacer the pressurized fluid is released into
the outlet port.

The fluid emerging from the outlet port is passed through the fluid pressure control valve. At high operating speeds the
pressure control valve maintains the output pressure to the gearbox at a predetermined maximum level. Excess fluid is
relieved from the pressure control valve and is directed, via the main pressure valve in the valve block, back to the pump inlet
port. This provides a pressurized feed to the pump inlet which prevents cavitation and reduces pump noise.

DTC Description Possible Cause Action P0967-12
Pressure Control Solenoid B
Control Circuit High - Circuit
Short to Battery
Pressure control solenoid
2 Circuit Short to Power Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index P0968-14
Pressure Control Solenoid C
Control Circuit / Open -
Circuit Short to Ground or
Open
Pressure control solenoid
3 Circuit Short to Ground
or Open Circuit Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the
top of the DTC Index P0970-11
Pressure Control Solenoid C
Control Circuit Low - Circuit
Short to Ground
Pressure control solenoid
3 Circuit Short to Ground Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index P0971-12
Pressure Control Solenoid C
Control Circuit High - Circuit
Short to Battery
Pressure control solenoid
3 Circuit Short to Power Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index P0972-22
Shift Solenoid A Control
Circuit Range/Performance -
signal amplitude >
maximum
Pressure control solenoid
1 current too large Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index P0973-11
Shift Solenoid A Control
Circuit Low - Circuit Short to
Ground
Shift solenoid A control
Circuit Short to Ground Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index P0973-14
Shift Solenoid A Control
Circuit Low - Circuit Short to
Ground or Open
Pressure control solenoid
1 Circuit Short to Ground
or Open Circuit Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the
top of the DTC Index P0973-1A
Shift Solenoid A Control
Circuit Low - Circuit
Resistance Below Threshold
Shift Solenoid A control
circuit resistance below
threshold Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the
top of the DTC Index P0973-1E
Shift Solenoid A Control
Circuit Low - Circuit
Resistance Out Of Range
Shift Solenoid A control
circuit resistance out of
range Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the
top of the DTC Index P0976-11
Shift Solenoid B Control
Circuit Low - Circuit Short to
Ground
Solenoid valve 2 Circuit
Short to Ground Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index P0976-14
Shift Solenoid B Control
Circuit Low - Circuit Short to
Ground or Open
Solenoid valve 2 Circuit
Short to Ground or Open
Circuit Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the
top of the DTC Index P1674-04
Control Module Software
Corrupted - System Internal
Failures
System internal failures Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index P1674-48
Control Module Software
Corrupted - Supervision
Software Failure
Supervision software
failure Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index P1707-07 Transfer Case Neutral or
Park/Neutral Indication
Circuit - commanded
position not reachable
Transfer case neutral or
park/neutral indication
circuit - mechanical
failures Clear the DTC. Test drive the Vehicle, engaging and
disengaging the parking lock several times. If the DTC
recurs, check parking lock components and replace as
required. If no faulty park lock component is found
Clear DTC and the DTC returns suspect the
Transmission control module. Install a new
Transmission control module as required, refer to the
new module/component installation note at the top of
the DTC Index P1707-72 Transfer Case Neutral or
Park/Neutral Indication
Circuit - Actuator Stuck Open
Transfer case neutral or
park/neutral indication
circuit - Actuator stuck
open Clear the DTC. Test drive the Vehicle, engaging and
disengaging the parking lock several times. If the DTC
recurs, check parking lock components and replace as
required. If no faulty park lock component is found
Clear DTC and the DTC returns suspect the
Transmission control module. Install a new
Transmission control module as required, refer to the
new module/component installation note at the top of
the DTC Index

DTC Description Possible Cause Action P1707-77 Transfer Case Neutral or
Park/Neutral Indication
Circuit - commanded
position not reachable
Commanded position not
reachable Clear the DTC. Test drive the Vehicle, engaging and
disengaging the parking lock several times. If the DTC
recurs, check parking lock components and replace as
required. If no faulty park lock component is found
Clear DTC and the DTC returns suspect the
Transmission control module. Install a new
Transmission control module as required, refer to the
new module/component installation note at the top of
the DTC Index P2700-07 Transmission Friction
Element A Apply Time
Range/Performance -
Mechanical Failures
Gear Ratio Monitoring.
Mechanical Failures Check and correct oil level. Clear DTC. If code
re-detects suspect Transmission (Gearbox) internal
fault. Install a new Transmission as required, refer to
the new module/component installation note at the top of the DTC Index P2701-07 Transmission Friction
Element B Apply Time
Range/Performance -
Mechanical Failures
Gear Ratio Monitoring.
Mechanical Failures Check and correct oil level. Clear DTC. If code
re-detects suspect Transmission (Gearbox) internal
fault. Install a new Transmission as required, refer to
the new module/component installation note at the top of the DTC Index P2702-07 Transmission Friction
Element C Apply Time
Range/Performance -
Mechanical Failures
Gear Ratio Monitoring.
Mechanical Failures Check and correct oil level. Clear DTC. If code
re-detects suspect Transmission (Gearbox) internal
fault. Install a new Transmission as required, refer to
the new module/component installation note at the top of the DTC Index P2703-07 Transmission Friction
Element D Apply Time
Range/Performance -
Mechanical Failures
Gear Ratio Monitoring.
Mechanical Failures Check and correct oil level. Clear DTC. If code
re-detects suspect Transmission (Gearbox) internal
fault. Install a new Transmission as required, refer to
the new module/component installation note at the top of the DTC Index P2704-07 Transmission Friction
Element E Apply Time
Range/Performance -
Mechanical Failures
Gear Ratio Monitoring.
Mechanical Failures Check and correct oil level. Clear DTC. If code
re-detects suspect Transmission (Gearbox) internal
fault. Install a new Transmission as required, refer to
the new module/component installation note at the top of the DTC Index P2713-04 Pressure Control Solenoid D
- System Internal Failures
System internal failures Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index P2713-48 Pressure Control Solenoid D
- Supervision Software
Failure
Supervision software
failure Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index P2716-22
Pressure Control Solenoid D
Electrical - signal amplitude
> maximum
Pressure Control Solenoid
D Electrical signal
amplitude > maximum Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the
top of the DTC Index P2716-1A
Pressure Control Solenoid D
Electrical - Circuit Resistance
Below Threshold
Pressure control solenoid
D circuit resistance below
threshold Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the
top of the DTC Index P2716-1E
Pressure Control Solenoid D
Electrical - Circuit Resistance
Out Of Range
Pressure control solenoid
D circuit resistance out
of range Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the
top of the DTC Index P2718-14
Pressure Control Solenoid D
Control Circuit / Open -
Circuit Short to Ground or
Open
Pressure control solenoid
D Circuit Short to Ground
or Open Circuit Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the
top of the DTC Index P2720-11
Pressure Control Solenoid D
Control Circuit Low - Circuit
Short to Ground
Pressure control solenoid
D Circuit Short to Ground Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index P2721-12
Pressure Control Solenoid D
Control Circuit High - Circuit
Short to Battery
Pressure control solenoid
D Circuit Short to Power Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index P2722-04 Pressure Control Solenoid E
- System Internal Failures
Pressure Control Solenoid
E system internal failures Suspect the Transmission control module. Install a
new Transmission control module as required, refer to
the new module/component installation note at the top of the DTC Index

DTC Description Possible Cause Action programming state
Attempted to program a non
default key
Instrument cluster Cold init
whilst in Ignition On state,
without key being present in
the SCU
Race condition caused by
closing driver door and
pressing the start button
within a small time window
Passive Key search function
from last door closed and key
inserted in the SCU instrument cluster. Design condition - advise customer of
starting sequence. Design condition - determine customer
transponder key usage B1B0187 Key Transponder
LIN fault
Instrument cluster power and
ground supply circuits - short,
open circuit
Smartcard docking station
power and ground supply
circuits - short, open circuit Carry out any pinpoint tests associated with this DTC using
the manufacturer approved diagnostic system. Check LIN
communications between smartcard docking station and
instrument cluster. Refer to the electrical circuit diagrams
and check smartcard docking station power and ground
supply circuits for short, open circuit and instrument cluster
power and ground supply circuits for short, open circuit B1B3305
Target I.D.
Transfer
CAN fault
ECM ignition, power and
ground supply circuits - short,
open circuit
Instrument cluster power and
ground supply circuits - short,
open circuit
ECM or instrument cluster
incorrectly configured Carry out any pinpoint tests associated with this DTC using
the manufacturer approved diagnostic system. Check CAN
communications between ECM and instrument cluster. Refer
to electrical circuit diagrams and check ECM ignition, power
and ground supply circuits for short, open circuit and
instrument cluster power and ground supply circuits for short,
open circuit. Perform the Immobilisation application from the
Set-up menu using the manufacturer approved diagnostic
system B1B3362
Target I.D.
Transfer
CAN fault
ECM ignition, power and
ground supply circuits - short,
open circuit
Instrument cluster power and
ground supply circuits - short,
open circuit
Incorrect ECM or instrument
cluster installed
Synchronisation error following
re-programming
Noise/EMC related error Carry out any pinpoint tests associated with this DTC using
the manufacturer approved diagnostic system. Check CAN
communications between ECM and instrument cluster. Refer
to electrical circuit diagrams and check ECM ignition, power
and ground supply circuits for short, open circuit and
instrument cluster power and ground supply circuits for short,
open circuit. Check correct ECM and instrument cluster
installed. Perform the Immobilisation application from the
Set-up menu using the manufacturer approved diagnostic
system. Check CAN network for interference/EMC related
issues B1B3364
Target
identification
transfer
Algorithm based failure -
signal plausibility failure
CAN fault
ECM ignition, power and
ground supply circuits - short,
open circuit
Instrument cluster power and
ground supply circuits - short,
open circuit
electronic steering column lock
status incomplete
Race condition caused by
closing driver door and
pressing the start button
within a small time window If the customer has not reported a non start issue, clear the
DTC and check vehicle starts correctly. If a non start has
been reported run the manufacturers approved diagnostic
system Start Authorisation Application and follow the actions
required for this DTC. Carry out any pinpoint tests associated
with this DTC using the manufacturer approved diagnostic
system. Check CAN communications between ECM and
instrument cluster. Refer to electrical circuit diagrams and
check ECM ignition, power and ground supply circuits for
short, open circuit and instrument cluster power and ground
supply circuits for short, open circuit. Check electronic
steering column lock operation. Advise customer of starting
sequence and to allow time to elapse between closing door
and pressing start button. B1B3387
Target I.D.
Transfer
CAN fault
ECM ignition, power and
ground supply circuits - short,
open circuit
Instrument cluster power and
ground supply circuits - short,
open circuit
Low battery voltage Carry out any pinpoint tests associated with this DTC using
the manufacturer approved diagnostic system. Check CAN
communications between ECM and instrument cluster. Refer
to electrical circuit diagrams and check ECM ignition, power
and ground supply circuits for short, open circuit and
instrument cluster power and ground supply circuits for short,
open circuit. Check battery is in serviceable condition and is
fully charged, check terminals etc www.JagDocs.com

1 Rear/Front Outer Approximately 600 mm (24 inches) Approximately 300 mm (12 inches) 2 Rear Inner Approximately 1800 mm (71 inches) Approximately 300 mm (12 inches) 3 Front Inner Approximately 800 mm (31 inches) Approximately 300 mm (12 inches) PARKING AID CAMERA

The parking aid camera receives an ignition power mode 6 power supply from the RJB. It also has a LIN (local interconnect network) bus connection from the RJB which is not used at the moment but installed for a later enhancement of the parking aid camera.

A shielded co-axial cable connection between the camera and the Touch Screen Display (TSD) is used for the video image
transmission.

The camera receives power at all times when the ignition is in power mode 6. When reverse gear is selected, the RJB transmits a reverse selected signal on the medium speed CAN bus message to the entertainment system control module. This message is transferred on the MOST to the TSD which displays the parking aid camera video input from the camera in
preference to the parking aid alert screen.

If the driver does not require the camera image in the TSD, a single touch on the screen will revert the display to the parking
aid alert screen. The camera view can be reselected by pressing the 'Rear Camera' softkey on the TSD.

When reverse gear is deselected, the camera image remains on the TSD for 10 seconds after the transmission has been put
into drive 'D'. This is to prevent the TSD switching between screens if the vehicle is being manoeuvred into a parking space. If
the vehicle forward speed exceeds 16 km/h (10 mph) within the 10 second period, the camera image is removed from the TSD.

If the TSD display is switched off, the camera image will be automatically displayed when reverse gear is selected. When
reverse gear is deselected and the 10 second period has expired, the TSD will revert back to its switched off state.



PARKING AID

Parking Aid Module Component Description

The parking aid module is located on the LH side of the luggage compartment.
The parking aid module has three connectors which provide for power, ground and CAN bus connections, front parking aid sensors and rear parking aid sensors. The medium speed CAN bus connections provide for the receipt of the following Distance Calculation
www.JagDocs.com

PARKING AID CAMERA

The parking aid camera receives an ignition power mode 6 power supply from the RJB. It also has a LIN bus connection with the RJB, which is used as a gateway. A shielded co-axial cable connection between the camera and the TSD is used for the video image transmission.

The camera receives power at all times when the ignition is in power mode 6. When reverse gear is selected, the RJB transmits a reverse selected message on the medium speed CAN bus. The information and entertainment module transfers the message on the MOST ring to the TSD, which displays the video input from the parking aid camera in preference to the parking
aid alert screen.

The display from the camera incorporates graphic overlays, indicating vehicle direction, width and proximity to surrounding
objects.



Item Description A Solid line: The projected wheel trajectory B Dotted line: The safe working width of the vehicle (including exterior mirrors) C Luggage compartment access guideline: Do not reverse beyond this point if luggage compartment access is required D Bumper inclusion E Parking sensor activation: A colored area appears, to indicate which rear sensors have been activated A single touch on the screen will revert the display to the parking aid alert screen. The camera view can be reselected by
pressing the Rear Camera soft key on the TSD.


NOTE: This can only be activated when reverse gear is selected.

When reverse gear is deselected, the camera image remains on the TSD for 2 seconds after the transmission has been put into
D (drive). If the vehicle forward speed in D exceeds 16 km/h (10 mph) the camera image is removed from the TSD.

If the TSD is switched off, the camera image will be automatically displayed when reverse gear is selected. When reverse gear
is deselected, after 10 seconds the TSD will revert back to its switched off state.

3 Satellite Radio digital receiver (Optional - NAS only) 4 Telephone control module (Optional) 5 Touch-screen 6 TV tuner (Optional) 7 Power amplifier (Not fitted to the Jaguar Sound System) 8 IAM (integrated audio module) 9 Portable audio module (Optional) 10 ICM (information control module)


AUDIO SYSTEM OPERATION System Operation

The components of the audio/infotainment system are all connected on the MOST (media orientated systems transport) ring.
The MOST (media orientated systems transport) ring is a fibre optic communications bus for multimedia applications. Audio
and control information is passed around the MOST (media orientated systems transport) ring and can be picked up by any of
the systems units. For example, radio station tuning/selection input by the vehicle user into the Touch-screen is sent along the
MOST (media orientated systems transport) ring and collected by the IAM (integrated audio module) which then selects the
requested radio station.

MOST (media orientated systems transport) technology uses a plastic optical fibre which forms a network connecting the audio
and multimedia system components. Each component in the ring is connected to the plastic optical fibre through a device
known as a FOT (fibre optical transceiver). Each FOT (fibre optical transceiver) has two optical connections; one connection is
sensitive to light and is the input, the second connection forms the light source and is the output. The system operates by
connecting the output from one FOT (fibre optical transceiver) to the input of another FOT (fibre optical transceiver).
The light signals are sent in one direction only and are formed in the following way:
Electrical signals are converted into an electrical current
The current then drives an LED (light emitting diode) in the FOT (fibre optical transceiver) to produce a high intensity
red light
The LED transmits the light through a fibre optic cable A photo diode in the FOT (fibre optical transceiver) at the opposite end of the fibre optic cable detects the light.
The following components may be connected to the MOST ring dependant on the vehicle equipment level:
IAM (integrated audio module)
Touch-screen
ICM (information control module)
DAB (digital audio broadcasting) radio receiver (Optional - Europe only)
Satellite radio digital receiver (Optional - NAS only)
Power amplifier (Not fitted to the Jaguar Sound System)
Portable audio module (Optional)
Telephone control module (Optional)
Navigation computer (Optional)
TV tuner (Optional)


NOTE: Do not view the red light directly

MOST is a synchronous network. A timing master supplies the clock information and all other devices on the network
synchronize their operation to this clock. The timing master for the MOST (media orientated systems transport) network on this
vehicle is the ICM (information control module). This unit also controls and manages the MOST (media orientated systems
transport) ring and the system components.

An Optical Bus tester is used in conjunction with the Jaguar diagnostic system to diagnose the MOST (media orientated
systems transport) system. The Optical Bus tester emits a visible, high intensity red light which can be connected into the ring
at any point to test the ring integrity. Disconnecting a MOST (media orientated systems transport) connector will reveal if the
high intensity red light is visible.

If a break occurs in the MOST (media orientated systems transport) ring fault codes are stored in the ICM (information control
module) which can be retrieved using the Jaguar diagnostic system equipment.

With reference to the audio system information and signal transfer the instrument cluster is the gateway between the high
and medium speed CAN bus communication protocols. The ICM (information control module) is the gateway between medium speed CAN and the MOST (media orientated systems transport) systems.
A typical example of information transfer is vehicle speed information from the ABS (anti-lock brake system) module used to
control the automatic volume control function. The vehicle speed information from the ABS module is sent on the high speed CAN network and collected by the instrument panel gateway. The signal is passed to the medium speed CAN network and onto the ICM (information control module) gateway. The ICM (information control module) calculates the volume adjustment
required. The corrected audio volume level signal is sent on the MOST (media orientated systems transport) network to the
IAM (integrated audio module) or Power amplifier (dependant on vehicle equipment level) for output to the speaker system.