instrument panel MERCEDES-BENZ SPRINTER 2006 User Guide
[x] Cancel search | Manufacturer: MERCEDES-BENZ, Model Year: 2006, Model line: SPRINTER, Model: MERCEDES-BENZ SPRINTER 2006Pages: 2305, PDF Size: 48.12 MB
Page 883 of 2305
SPECIAL TOOLS
GENERATOR
DESCRIPTION
The generator is belt-driven by the engine using a
serpentine-type drive belt. It is serviced only as a
complete assembly. If the generator fails for any rea-
son, the entire assembly must be replaced.
On certain engines, the decoupler pulley may be
replaced separately.
OPERATION
As the energized rotor begins to rotate within the
generator, the spinning magnetic field induces a cur-
rent into the windings of the stator coil. Once the
generator begins producing sufficient current, it also
provides the current needed to energize the rotor.
The stator winding connections deliver the induced
AC current to 3 positive and 3 negative diodes for
rectification. From the diodes, rectified DC current isdelivered to the vehicle electrical system through the
generator battery terminal.
Although the generators appear the same exter-
nally, different generators with different output rat-
ings are used on this vehicle. Be certain that the
replacement generator has the same output rating
and part number as the original unit. Refer to Spec-
ifications and see Generator Ratings for amperage
ratings and part numbers.
Noise emitting from the generator may be caused
by: worn, loose or defective bearings; a loose or defec-
tive drive pulley (decoupler pulley); incorrect, worn,
damaged or misadjusted fan drive belt; loose mount-
ing bolts; a misaligned drive pulley or a defective sta-
tor or diode.
An instrument panel mounted, battery charge indi-
cator lamp is used. When the key is in the on posi-
tion, the lamp will be illuminated. This is done as a
bulb check. If this lamp remains illuminated while
the engine is running, a Diagnostic Trouble Code
(DTC) has been detected for the charging system.
REMOVAL
CAUTION: DISCONNECT NEGATIVE CABLE FROM
BATTERY BEFORE REMOVING BATTERY OUTPUT
WIRE FROM GENERATOR. FAILURE TO DO SO
CAN RESULT IN INJURY.
CAUTION: Never force a belt over a pulley rim
using a screwdriver. The synthetic fiber of the belt
can be damaged.
CAUTION: When installing a serpentine accessory
drive belt, the belt MUST be routed correctly. The
water pump will be rotating in the wrong direction if
the belt is installed incorrectly, causing the engine
to overheat. Refer to belt routing label in engine
compartment, or refer to Belt Schematics in Cooling
System.
(1) Disconnect and isolate negative battery cable.
(2) Remove generator drive belt. Refer to Cooling
System for procedure.
(3) Raise and support vehicle.
(4) Remove protective plastic cover from B+ stud
at top of generator.
(5) Remove nut securing battery output cable to
B+ terminal at top of generator.
(6) Unplug field terminal connector at rear of gen-
erator.
(7) Remove 4 generator mounting bolts (Torx-style
#12 bit) (Fig. 1).
(8) Remove generator from lower side of vehicle.
GENERATOR DECOUPLER TOOL #8433
GENERATOR DECOUPLER TOOL #8823
8F - 18 CHARGING SYSTEMVA
Page 895 of 2305
Starting System Diagnosis
CONDITION POSSIBLE CAUSE CORRECTION
STARTER DOES NOT
DISENGAGE.1. Starter motor improp-
erly installed.1. Refer to Starter Motor Removal and Installation.
Tighten starter mounting hardware to correct torque
specifications.
2. Starter relay faulty. 2. Refer to Starter Relay Diagnosis and Testing. Re-
place starter relay if required.
3. Ignition switch faulty. 3. Refer to Ignition Switch and Key Lock Cylinder. Re-
place ignition switch if required.
4. Starter motor faulty. 4. If all other starting system components and circuits
test OK, replace starter motor.
INSPECTION
For complete starter wiring circuit diagrams, refer
to 8, Wiring Diagrams. Before removing any unit
from starting system for repair or diagnosis, perform
the following inspections:
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO 8, PASSIVE RESTRAINT SYS-
TEMS, BEFORE ATTEMPTING ANY STEERING
WHEEL, STEERING COLUMN, OR INSTRUMENT
PANEL COMPONENT DIAGNOSIS OR SERVICE.
FAILURE TO TAKE THE PROPER PRECAUTIONS
COULD RESULT IN ACCIDENTAL AIRBAG DEPLOY-
MENT AND POSSIBLE PERSONAL INJURY.
²Battery- Visually inspect battery for indica-
tions of physical damage and loose or corroded cable
connections. Determine state-of-charge and cranking
capacity of battery. Charge or replace battery if
required. Refer toBatteryin 8, Battery.
²Ignition Switch- Visually inspect ignition
switch for indications of physical damage and loose
or corroded wire harness connections. Refer toIgni-
tion Switch and Key Lock Cylinder.
²Park/Neutral Position Switch- Visually
inspect park/neutral position switch for indications of
physical damage and loose or corroded wire harness
connections. Refer toPark/Neutral Position
Switchin 21, Transmission.
²Starter Relay- Visually inspect starter relay
for indications of physical damage and loose or cor-
roded wire harness connections.
²Starter Motor- Visually inspect starter motor
for indications of physical damage and loose or cor-
roded wire harness connections.
²Starter Solenoid- Visually inspect starter sole-
noid for indications of physical damage and loose or
corroded wire harness connections.
²Wiring- Visually inspect wire harnesses for
damage or corrosion. Repair or replace any faulty
wiring, as required. Refer to 8, Wiring Diagrams.
TESTING
COLD CRANKING TEST
For complete starter wiring circuit diagrams, refer
to 8, Wiring Diagrams. The battery must be fully-
charged and load-tested before proceeding. Refer to
Batteryin 8, Battery.
(1) Connect volt-ampere tester to battery terminals
(Fig. 1). See instructions provided by manufacturer of
volt-ampere tester being used.
(2) Fully engage parking brake.
(3) Place gearshift selector lever in Park position.
(4) Verify that all lamps and accessories are
turned off.
(5) To prevent engine from starting, remove Fuel
Pump Relay. This relay is located in Power Distribu-
tion Center (PDC). Refer to label on PDC cover for
relay location.
WARNING: IF EQUIPPED WITH DIESEL ENGINE,
ATTEMPT TO START ENGINE A FEW TIMES
BEFORE PROCEEDING WITH FOLLOWING STEP.
Fig. 1 VOLTS-AMPS TESTER CONNECTIONS -
TYPICAL
1 - POSITIVE CLAMP
2 - NEGATIVE CLAMP
3 - INDUCTION AMMETER CLAMP
8F - 30 STARTING SYSTEMVA
Page 902 of 2305
HEATED SYSTEMS
TABLE OF CONTENTS
page page
HEATED GLASS........................... 1
HEATED MIRRORS......................... 9HEATED SEATS........................... 10
HEATED GLASS
TABLE OF CONTENTS
page page
HEATED GLASS
DESCRIPTION..........................1
OPERATION............................1
DIAGNOSIS AND TESTING
ELECTRIC BACKLIGHT (EBL) SYSTEM.....2
REAR WINDOW DEFOGGER RELAY
DESCRIPTION..........................3
OPERATION............................3
REMOVAL.............................4
INSTALLATION..........................4REAR WINDOW DEFOGGER SWITCH
DESCRIPTION..........................4
OPERATION............................4
DIAGNOSIS AND TESTING
REAR WINDOW DEFOGGER SWITCH......5
REMOVAL.............................6
INSTALLATION..........................6
REAR WINDOW DEFOGGER GRID
STANDARD PROCEDURE
GRID LINE AND TERMINAL REPAIR........7
HEATED GLASS
DESCRIPTION
CAUTION: Grid lines can be damaged or scraped
off with sharp instruments. Care should be taken in
cleaning glass or removing foreign materials,
decals or stickers. Normal glass cleaning solvents
or hot water used with rags or toweling is recom-
mended.
The rear window defogger system, also known as
the electric backlight (EBL), consists of a backglass
with two vertical bus bars linked by a series of grid
lines fired onto the inside surface of the rear window.
The EBL system is turned On or Off by a control
switch (Fig. 1) located in the instrument panel near
the right side of the steering wheel, which sends a
request signal to the rear window defogger module
that operates the left and right rear window defogger
relays located in the fuse/relay block under the driv-
ers seat.
Circuit protection is provided by a 30 amp fuse
also located in the fuse/relay block.
OPERATION
When the rear window defogger switch is pressed
to the On position, current is directed through the
switch to the rear window defogger module. The rear
window defogger module then grounds the control
side of the left and right rear window defogger (EBL)
Fig. 1 Rear Window Defogger Switch
1 - REAR WINDOW DEFOGGER SWITCH
2 - INSTRUMENT PANEL
VAHEATED SYSTEMS 8G - 1
Page 903 of 2305
relays which allows battery current to flow to the
rear window defogger grid lines. The heated grid
lines heat the rear glass to help clear the rear win-
dow surfaces of fog or frost.
The electric backlight (EBL) system is controlled
by the EBL timing circuity, which is integral to the
rear window defogger module. A yellow indicator in
the switch will illuminate to indicate when the EBL
system is turned on.
NOTE: The EBL system turns off automatically after
approximately 10 minutes of initial operation. Each
following activation cycle of the EBL system will
last approximately five minutes.
The EBL system will be automatically turned off
after a programmed time interval of about ten min-
utes. After the initial time interval has expired, if the
rear window defogger switch is pressed to the On
position again during the same ignition cycle, the
EBL system will automatically turn off after about
five minutes.
The EBL system will automatically shut off if the
ignition switch is turned to the Off position, or it can
be turned off manually by pressing the defogger
switch a second time.
DIAGNOSIS AND TESTING
ELECTRIC BACKLIGHT (EBL) SYSTEM
NOTE: Illumination of the defogger switch indicator
lamp means that there is electrical current available
at the output of the rear window defogger logic cir-
cuitry, but does not confirm that the electrical cur-
rent is reaching the rear glass heating grid lines.
NOTE: For circuit descriptions and diagrams of the
EBL system, refer to 8W - WIRING DIAGRAM
INFORMATION.
Operation of the electrical backlight (EBL) system
can be confirmed by the following:
(1) Turn the ignition switch to the On position. Set
the rear window defogger switch in the On position.
The rear window defogger operation can be checked
by feeling the rear window glass. A distinct difference
in temperature between the grid lines and the adja-
cent clear glass should be detected within three to
four minutes of operation.
(2) If a temperature difference is not detected, use
a 12-volt DC voltmeter and contact the rear glass
heating grid terminal B with the negative lead, and
terminal A with the positive lead (Fig. 2). The volt-
meter should read battery voltage. If the voltmeter
does not read battery voltage, check the following:²Confirm that the ignition switch is in the On
position.
²Make sure that the rear glass heating grid feed
wires and ground wires are connected to the window
terminals. Confirm that the ground wires have conti-
nuity to ground.
²Check that fuse 7 (15 amp) in fuse block #1 and
fuse 10 (30 amp) in the fuse/relay block are OK. The
fuses must be tight in there receptacles and all elec-
trical connections must be secure.
(3) When the above steps have been completed and
the rear glass heating grid is still inoperative, one or
more of the following is faulty.
²Rear window defogger switch in the instrument
panel.
²Rear window defogger (EBL) relays in the fuse/
relay block.
²Rear window defogger (EBL) relay control circu-
ity in the rear window defogger module.
²Check for a loose wire connector or a wire
pushed out of a connector.
²Rear window grid lines (all grid lines would
have to be broken, or the power feed or ground wire
not connected, for the entire heating grid to be inop-
erative).
(4) If the system operation has been verified but
the defogger switch indicator does not illuminate,
check for voltage at the defogger indicator from the
rear window defogger module when the defogger
switch is activated. If power is present, replace the
rear window defogger switch.
(5) If broken defogger grid lines are suspected, use
a 12-volt DC voltmeter and contact terminal B with
the negative lead and each rear glass heating grid
line at it's mid-point with the positive lead. The volt-
meter should read approximately 6 volts at each grid
line mid-point C. If the voltmeter does not read
approximately 6 volts, repair the open grid line(s)
(Refer to 8 - ELECTRICAL/HEATED GLASS/REAR
WINDOW DEFOGGER GRID - STANDARD PROCE-
DURE).
8G - 2 HEATED GLASSVA
Page 905 of 2305
²The coil ground terminal (86) is hardwired to
ground point G202.
²The coil battery terminal (85) receives a battery
current input from the rear window defogger module
when the rear window defogger switch is energized.
²The normally open terminal (87) provides a bat-
tery current output to the rear window defogger grid
lines through the relay output circuit only when the
rear window defogger relay coil is energized.
²The normally closed terminal (87A) is not con-
nected to any circuit in this application, but provides
a battery current output only when the rear window
defogger relay coil is de-energized.
The left and right EBL relays cannot be repaired
and, if faulty or damaged, they must be replaced.
Refer to the appropriate wiring information for diag-
nosis and testing of the EBL relays and for complete
rear window defogger system wiring diagrams.
REMOVAL
(1) Disconnect and isolate the negative battery
cable.
(2) Remove the cover from the fuse/relay block
(Fig. 4).
NOTE: Refer to the fuse and relay map located on
the inner surface of the fuse/relay block cover for
the left and right rear window defogger (EBL) relay
locations.
(3) Remove the EBL relays from the fuse/relay
block as required.
INSTALLATION
NOTE: Refer to the fuse and relay map located on
the inner surface of the fuse/relay block cover for
the left and right rear window defogger (EBL) relay
locations.
(1) Position the rear window defogger (EBL) relays
as required into their proper receptacles in the fuse/
relay block.
(2) Align the EBL relay terminals with the termi-
nal cavities in the fuse/relay block receptacles.
(3) Push down firmly on the EBL relays until the
terminals are fully seated in the terminal cavities in
the fuse/relay block receptacles.
(4) Install the cover onto the fuse/relay block.
(5) Reconnect the negative battery cable.
REAR WINDOW DEFOGGER
SWITCH
DESCRIPTION
The rear window defogger switch is mounted in the
instrument panel to the right of the steering wheel
(Fig. 5). The rear window defogger switch contains a
yellow indicator lamp that illuminates when the rear
window defogger (EBL) system is activated.
The rear window defogger switch and the defogger
switch indicator cannot be repaired and, if faulty or
damaged, the rear window defogger switch must be
replaced.
OPERATION
A yellow indicator lamp will illuminate when the
rear window defogger switch is activated. The switch
Fig. 4 Rear Window Defogger (EBL) Relays
1 - DRIVERS SEAT
2 - FUSE/RELAY BLOCKFig. 5 Rear Window Defogger Switch
1 - REAR WINDOW DEFOGGER SWITCH
2 - INSTRUMENT PANEL
8G - 4 HEATED GLASSVA
Page 906 of 2305
energizes the timing circuit of the rear window defog-
ger module which then activates the rear window
defogger (EBL) relays. The EBL relays controls the
current flow to the rear window defogger grids. The
EBL system will operate for approximately five min-
utes or until the rear window defogger switch or igni-
tion switch is turned off. Refer to 8 - ELECTRICAL/
HEATED GLASS - DIAGNOSIS AND TESTING for
diagnosis and testing of the rear window defogger
switch.
The rear window defogger switch cannot be
repaired and, if faulty or damaged, it must be
replaced.
DIAGNOSIS AND TESTING
REAR WINDOW DEFOGGER SWITCH
WARNING: On vehicles equipped with airbags, dis-
able the airbag system before attempting any steer-
ing wheel, steering column, or instrument panel
component diagnosis or service. Disconnect and
isolate the battery negative (ground) cable, then
wait two minutes for the airbag system capacitor to
discharge before performing further diagnosis or
service. This is the only sure way to disable the air-
bag system. Failure to take the proper precautions
could result in an accidental airbag deployment and
possible personal injury.
NOTE: The rear window defogger switch may be
tested in the vehicle or out of the vehicle, on a
bench.
NOTE: For circuit descriptions and diagrams of the
rear window defogger system, refer to 8W - WIRING
DIAGRAM INFORMATION.
(1) Remove the rear window defogger switch from
the instrument panel, but leave the switch connected
(Refer to 8 - ELECTRICAL/HEATED GLASS/REAR
WINDOW DEFOGGER SWITCH - REMOVAL).
(2) Turn the ignition switch ON.
(3) Using a voltmeter, check for battery voltage at
Pin 3 of the rear window defogger switch (Fig. 6).
(a) If OK, go to Step 4.
(b) If NOT OK, check fuse 7 (15 amp) in fuse
block #1. If fuse is OK, check the wiring circuits.
Refer to 8W - WIRING DIAGRAM INFORMA-
TION.
(4) Check Pin 7, with defogger switch in the On
position there should be battery voltage and, no volt-
age with the switch in the Off position.
(a) If OK, go to Step 5.(b) If NOT OK, no voltage in the On position or
voltage in the Off position, replace the rear window
defogger switch.
(5) Press the defogger switch to the On position.
The indicator lamp should come on and remain on
for approximately 5 minutes.
(a) If OK, install the rear window defogger
switch (Refer to 8 - ELECTRICAL/HEATED
GLASS/REAR WINDOW DEFOGGER SWITCH -
INSTALLATION).
(b) If NOT OK, go to Step 6.
(6) Check Pin 9, with defogger switch in the On
position there should be battery voltage.
(a) If OK, go to Step 7.
(b) If NOT OK, check the wiring circuits. Refer
to 8W - WIRING DIAGRAM INFORMATION.
(7) Check Pin 10 for a good ground.
(a) If OK, replace the rear window defogger
switch.
(b) If NOT OK, check the wiring circuits. Refer
to 8W - WIRING DIAGRAM INFORMATION.
Fig. 6 Rear Window Defogger Switch Connector
VAHEATED GLASS 8G - 5
Page 907 of 2305
DEFOGGER SWITCH CONNECTOR PIN
CALL-OUT
PIN FUNCTION
1 FUSED B+ (DRL RELAY)
3 IGNITION SWITCH OUTPUT (START-
RUN)
5 PANEL LAMPS DRIVER
7 DEFOGGER SWITCH OUTPUT
9 PANEL LAMPS DRIVER
10 GROUND
REMOVAL
WARNING: To avoid personal injury or death, on
vehicles equipped with airbags, disable the supple-
mental restraint system before attempting any
steering wheel, steering column, airbag, seat belt
tensioner, or instrument panel component diagno-
sis or service. Disconnect and isolate the battery
negative (ground) cable, then wait two minutes for
the system capacitor to discharge before perform-
ing further diagnosis or service. This is the only
sure way to disable the supplemental restraint sys-
tem. Failure to take the proper precautions could
result in accidental airbag deployment.
(1) Disconnect and isolate the negative battery
cable.
(2) Remove the cluster bezel from the instrument
panel (Fig. 7) (Refer to 23 - BODY/INSTRUMENT
PANEL/CLUSTER BEZEL - REMOVAL).(3) From the back of the cluster bezel, squeeze the
two latches on the rear window defogger switch body
and push the switch out through the face of the bezel
(Fig. 8).
(4) Remove the rear window defogger switch from
the cluster bezel.
INSTALLATION
(1) Position the rear window defogger switch to the
proper mounting hole on the face of the cluster bezel.
(2) Using hand pressure, push the rear window
defogger switch firmly and evenly into the switch
Fig. 7 Cluster Bezel Remove/Install
1 - SCREWS (2)
2 - CLUSTER BEZEL
3 - REAR WINDOW DEFOGGER SWITCH
4 - DEFOGGER SWITCH CONNECTOR
5 - WIRE HARNESS CONNECTOR
6 - WIRE HARNESS CONNECTOR
Fig. 8 Headlamp Leveling Switch Remove/Install
1 - SWITCH
2 - LATCH (2)
3 - CLUSTER BEZEL
8G - 6 HEATED GLASSVA
Page 908 of 2305
mounting hole of the cluster bezel until both of the
latches on the switch body are fully engaged.
(3) Install the cluster bezel (Refer to 23 - BODY/
INSTRUMENT PANEL/CLUSTER BEZEL -
INSTALLATION).
(4) Reconnect the negative battery cable.
REAR WINDOW DEFOGGER
GRID
STANDARD PROCEDURE
GRID LINE AND TERMINAL REPAIR
REAR WINDOW DEFOGGER GRID LINE REPAIR
WARNING: The repair kit contains epoxy resin and
amine type hardener which may cause skin or eye
irritation and can be harmful if swallowed. Use with
adequate ventilation. Do not use near fire or open
flame the contents contain flammable solvents.
Keep out of reach of children.
²DO NOT TAKE INTERNALLY, IF SWALLOWED
INDUCE VOMITING AND CALL A PHYSICIAN IMME-
DIATELY.
²IF SKIN CONTACT OCCURS, WASH AFFECTED
AREAS WITH SOAP AND WATER.
²IF EYE CONTACT OCCURS, FLUSH WITH
PLENTY OF WATER.
The repair of the grid lines is possible using the
MopartGrid Line Repair Package or an equivalent.
(1) Mask the repair area so the conductive epoxy
can be extended onto the grid line(s) or the bus bar
(Fig. 9).
(2) Follow the instructions in the repair kit for
preparing the damaged area.
(3) Remove the package separator clamp and mix
the conductive epoxy thoroughly. Fold in half and cut
the center corner to dispense the epoxy.
(4) Apply the conductive epoxy through the slit in
the masking tape. Overlap both ends of the break(s)
by 19 mm (3/4 inch).
(5) Carefully remove the masking tape from the
grid line(s).
CAUTION: To prevent the glass from fracturing, do
not allow the glass surface to exceed 204É C (400É
F).
(6) Allow the epoxy to cure 24 hours at room tem-
perature or use a heat gun with a 260É to 371É C
(500É to 700É F) range for 15 minutes. Hold the heat
gun approximately 254 mm (10 inches) from the
repaired area.(7) After the conductive epoxy is properly cured,
verify operation of the rear window defogger.
REAR WINDOW DEFOGGER GRID TERMINAL REPAIR
CAUTION: Do not use a flame type solder gun or an
electric solder gun rated greater than 500 watts or
damage to the glass may occur.
If the rear window defogger grid terminal(s) is
damaged or separated from the rear window, the new
grid terminal(s) must be securely fastened to the rear
window defogger bus bar by soldering.
(1) If the grid terminal(s) is broken and a portion
of the terminal is still attached to the heating grid,
remove the portion of the clip remaining in the wire
harness connector(s).
CAUTION: To prevent the glass from fracturing, do
not allow the glass surface to exceed 204É C (400É
F).
(2) If the grid terminal(s) is broken and a portion
of the terminal is still attached to the rear window
defogger bus bar, apply heat with a solder gun to the
portion of the terminal on the glass until the solder
starts to flow. Remove the terminal and carefully
smooth the solder on the bus bar.
NOTE: Wait five minutes for the glass to cool after
applying heat with a solder gun before proceeding.
NOTE: Use care when cleaning the mating surfaces.
Excessive abrasion may wear away the copper grid
surface causing grid continuity to be lost.
(3) Clean the mating surfaces on the grid bus bar
and the new terminal(s) with ª000º Extra Fine Steel
Wool or an equivalent.Fig. 9 Grid Line Repair
1 - BREAK
2 - GRID LINE
3 - MASKING TAPE
VAHEATED GLASS 8G - 7
Page 911 of 2305
HEATED SEATS
TABLE OF CONTENTS
page page
HEATED SEATS
DESCRIPTION.........................10
OPERATION...........................10
DIAGNOSIS AND TESTING - HEATED SEATS . 11
DRIVER HEATED SEAT SWITCH
DESCRIPTION.........................11
OPERATION...........................11
DIAGNOSIS AND TESTING - DRIVER HEATED
SEAT SWITCH........................11
REMOVAL.............................11
INSTALLATION.........................12
HEATED SEAT ELEMENT
DESCRIPTION.........................12
OPERATION...........................12
DIAGNOSIS AND TESTING - HEATED SEAT
ELEMENT...........................12
HEATED SEAT RELAY
DESCRIPTION.........................12OPERATION...........................13
DIAGNOSIS AND TESTING - HEATED SEAT
RELAY..............................13
REMOVAL.............................13
INSTALLATION.........................13
HEATED SEAT SENSOR
DESCRIPTION.........................13
DIAGNOSIS AND TESTING - HEATED SEAT
SENSOR............................13
PASSENGER HEATED SEAT SWITCH
DESCRIPTION.........................13
OPERATION...........................13
DIAGNOSIS AND TESTING - PASSENGER
HEATED SEAT SWITCH.................14
REMOVAL.............................14
INSTALLATION.........................14
HEATED SEATS
DESCRIPTION
Individually controlled, electrically heated front
seats are available factory-installed optional equip-
ment on this model. Vehicles with this option can be
visually identified by the two separate heated seat
switches mounted in the instrument panel. The
heated seat system allows the front seat driver and
passenger to select from two different levels of sup-
plemental electrical seat heating, or no seat heating
to suit their individual comfort requirements. The
heated seat system for this vehicle includes the fol-
lowing major components, which are described in fur-
ther detail later in this section:
²Heated Seat Elements- Four heated seat ele-
ments are used per vehicle, two for each front seat.
One heating element in the seat back and one in the
seat cushion. The heated seat sensor is integral to
the seat cushion heating element. The heated seat
elements are integral to the front seat and seat back
cushions. Refer to heated seat elements later in this
section for additional information.
²Heated Seat Relay- One heated seat relay is
used per vehicle. The relay is located in the fuse
block and is responsible for distributing the voltage
(B+) to the heated seat elements.
²Heated Seat Sensors- Two heated seat sen-
sors are used per vehicle, one for each front seat. The
heated seat sensors are integral to each of the heatedseat element assemblies. Refer to heated seat sensor
later in this section for additional information.
²Heated Seat Switches- Two heated seat
switches are used per vehicle, one for each front seat.
The switches are mounted in the instrument panel.
Refer to heated seat switches later in this section for
additional information.
Hard wired circuitry connects the heated seat sys-
tem components to each other through the electrical
system of the vehicle. Refer to Wiring for additional
information. The wiring information includes wiring
diagrams, proper wire and connector repair proce-
dures, further details on wire harness routing and
retention, as well as pin-out and location views for
the various wire harness connectors, splices and
grounds.
OPERATION
The heated seat system is designed to provide indi-
vidually controlled, supplemental heat to the seat
cushion and seat back surfaces of both front seats.
Because this system converts electrical current to
heat, the heated seat system can provide a measure
of warm comfort almost immediately upon entering a
cold vehicle, rather than having to wait for the
engine coolant to reach sufficient temperature to
deliver heat through the conventional heater system.
This system allows each front seat occupant to indi-
vidually select one of two comfort levels, Hi or Lo, or
to turn the heater for their seat off.
8G - 10 HEATED SEATSVA
Page 912 of 2305
The heated seat system components operate on
battery current received through a fuse in the Fuse
Block on a fused ignition switch output (run-acc) cir-
cuit so that the system will only operate when the
ignition switch is in the On or Accessory positions.
The heated seat system will be turned Off automati-
cally whenever the ignition switch is turned to any
position except On or Accessory. Also, the heated seat
system will not operate when the surface tempera-
ture of the seat cushion cover at either heated seat
sensor is above the designed temperature set points
of the system.DIAGNOSIS AND TESTING - HEATED SEATS
Refer toWiringfor the appropriate wiring infor-
mation. The wiring information includes wiring dia-
grams, proper wire and connector repair procedures,
further details on wire harness routing and reten-
tion, as well as pin-out and location views for the
various wire harness connectors, splices and grounds.
HEATED SEAT SYSTEM DIAGNOSIS
CONDITION POSSIBLE CAUSES CORRECTION
NO HEATED SEAT SWITCH
ILLUMINATION WITH IGNI-
TION ON1. Faulty fuse. 1. Check heated seat fuse in Fuse Block. Re-
place fuse, if required.
2. Wiring faulty. 2. Check fused ignition switch output (run-acc)
circuit from heated seat switch connector to igni-
tion switch. Repair, if required.
3. Ground faulty. 3. Check for ground at heated seat switch con-
nector. Repair, if required.
4. Faulty switch. 4. Refer to Heated Seat Switch for the proper
switch diagnosis and testing procedures.
DRIVER HEATED SEAT
SWITCH
DESCRIPTION
The heated seat switches are located on the instru-
ment panel, in the accessory switch bezel. The two,
momentary rocker type switches provide a signal to
the Heated Seat Relay through separate hard wired
circuits. Each switch contains two light emitting
diodes (LED), one for each High and Low setting to
let the occupant know that the seat heater system is
on.
The heated seat switches and their LED's cannot
be repaired. If either switch is faulty or damaged the
entire switch must be replaced.
OPERATION
There are three modes that can be selected with
each of the heated seat switches: Off, Low, and High.
When the top of the switch rocker is depressed, the
low mode is selected and the low mode LED indicator
illuminates. Depressing the top of the switch rocker a
second time will turn the heated seat to Off. This
same process is repeated for High heat setting. The
heated seats will automatically return to the Off
mode anytime the vehicle ignition switch is turned
Off.Both switches provide separate hard wire inputs to
the Heated Seat Relay to indicate the selected mode.
The Heated Seat Relay responds to the heated seat
switch messages by controlling the output to the seat
heater elements of the selected seat.
DIAGNOSIS AND TESTING - DRIVER HEATED
SEAT SWITCH
For circuit description and diagrams, refer toWir-
ing.
(1) Inspect the Heated Seat Switches for apparent
damage or sticking/binding and replace if required.
Refer to Heated Seat Switch Removal and Installa-
tion in this section.
(2) Replace the heated seat switch with a known
good unit and retest the heated seat system.
REMOVAL
(1) Disconnect and isolate the negative battery
cable.
(2) Remove the gear selector bezel trim. Refer to
the Body section for the procedure.
(3) Remove the storage bin. Refer to the Body sec-
tion for the procedure.
(4) Remove the switch bezel retaining screw and
remove the switch bezel from the instrument panel.
Refer to the Body section for the procedure.
(5) Disconnect electrical connections.
VAHEATED SEATS 8G - 11