Circuit L39 supplies voltage to the fog lamps. Cir-
cuit Z1 provides ground for the fog lamps.
If the high beam lamps are ON, circuit G465 ener-
gizes the high beam relay. When the high beam relay
energizes, the contacts open and power is not sup-
plied to the fog lamps. Circuit Z1 provides ground for
the coil side of the high beam relay.
Circuit E2 provides voltage for the illumination
lamp in the fog lamp switch.
HELPFUL INFORMATION
²Circuit L3 splices to power circuit G465. Circuit
L3 powers the high beam circuit of the headlamps.
HEADLAMP DELAY MODULE
When the operator turns off the ignition switch and
the headlamp switch, the headlamp delay module
powers the headlamps for approximately 45 seconds.
When the ignition switch is in the RUN position,
circuit A21 powers circuit F87 through fuse 17 in the
fuse block. Circuit F87 supplies the IGNITION ON/
OFF signal to the headlamp delay module. Circuit Z1
provides ground for the module.
When the headlamp delay module activates, it con-
nects circuit X4 from fuse 11 in the fuse block to cir-
cuit F34. Circuit F34 powers the headlamps through
the headlamp dimmer switch circuit L3.
HELPFUL INFORMATION
Circuit A7 from fuse 3 in the PDC supplies voltage
to the fuse block bus bar that powers circuit X4
through the fuse in cavity 11.
DAYTIME RUNNING LAMP (DRL) MODULE
On vehicles built for sale in Canada, the low-beam
headlamps operate when the ignition switch is in the
RUN position.
When the ignition switch is in the RUN position,
circuit A1 from fuse 6 in the Power Distribution Cen-
ter (PDC), connects to circuit A21. Circuit A21 splices
to supply power to the DRL module.
Circuit A3 from fuse 5 in the PDC connects to DRL
module. Circuit A3 is HOT at all times.The DRL module receives the vehicle speed sensor
input from circuit G7. Circuit G465 from the DRL
module splices to circuit L3 to provide power for the
high beam indicator lamp in the instrument cluster.
Circuit L4 powers the low beams of the left and
right headlamps. When the headlamp switch is OFF,
the DRL module powers the low beams on circuit L4.
When the headlamps are ON, the dimmer switch in
the multi-function switch powers the low beams on
circuit L4.
Circuit L3 feeds the high beams of the headlamps.
When the operator flashes the headlamps with the
stalk of the multi-function switch, the DRL senses
voltage on circuit L3. When it senses voltage on cir-
cuit L3, the DRL module stops supplying power to
the low beams on circuit L4.
Circuit Z12 provides ground for the DRL module.
DIAGRAM INDEX
Component Page
Chime/Buzzer Module......................8W-50-8
Daytime Running Lamps (DRL) Module..........8W-50-3
Fog Lamps.............................8W-50-7
Fog Lamp Switch........................8W-50-7
Fuse 3 (PDC)...........................8W-50-9
Fuse 4 (Fuse Block).......................8W-50-9
Fuse 5 (PDC).....................8W-50-2, 3, 6, 9
Fuse 6 (PDC).........................8W-50-2, 8
Fuse 7 (PDC)...........................8W-50-6
Fuse 11 (Fuse Block)......................8W-50-9
Fuse 13 (PDC)..........................8W-50-6
Fuse 15 (Fuse Block)....................8W-50-3, 6
Fuse 17 (Fuse Block)......................8W-50-8
Fuse 19 (Fuse Block)......................8W-50-6
Headlamps.............................8W-50-5
Headlamp Dimmer Switch.................8W-50-4, 9
Headlamp Switch.....................8W-50-4, 6, 9
High Beam Relay.........................8W-50-7
Ignition Switch........................8W-50-3, 8
Park Lamp Relay.........................8W-50-6
Side Marker Lamps.......................8W-50-5
Tail, Stop and Turn Signal Lamps..............8W-50-5
Telltale Connector (Instrument Cluster)...........8W-50-9
8W - 50 - 2 8W-50 FRONT LIGHTINGÐXJ VEHICLESJ
REAR LIGHTING
TAIL LAMPS AND REAR LICENSE PLATE LAMPS
Circuit A3 from fuse 5 in the Power Distribution
Center (PDC) connects to a bus bar in the fuse block
which feeds circuit L7. Fuse 15 in the fuse block pro-
tects circuit L7.
The headlamp switch has three positions: ON,
PARK (parking lamps) and OFF, plus a dimmer
switch. When the headlamp switch is in the PARK or
ON position, the switch connects circuit L7 to circuit
L90. From the headlamp switch, circuit L90 branches
to power the front parking lamps and rear tail
lamps, side marker lamps, and rear license plate
lamps.
GROUND CIRCUIT
Circuit Z1 provides a ground for the parking lamps,
tail lamps, and rear license plate lamps.
HELPFUL INFORMATION
²If the vehicle is equipped with factory installed
trailer tow, circuit L90 splices to the trailer tow har-
ness.
²Check fuse 5 in PDC.
²Check fuse 15 in the fuse block.
²When the headlamp switch is in the PARK or ON
position, circuit L7 also connects to circuit E2. Cir-
cuit E2 continues through fuse 19 in the fuse block.
Circuit E2 powers the illumination lamps.
STOP LAMPS AND CHMSL LAMPS
Circuit L9 from fuse 4 in the Power Distribution
Center (PDC) connects to the stop lamp switch.
When the operator depresses the brake pedal, the
stop lamp switch closes and connects circuit L9 to
circuit L50. Circuit L50 connects to the stop lamps
and Center High Mounted Stop Lamps (CHMSL).
Circuit Z1 provides a ground for the stop lamps and
CHMSL lamps.
HELPFUL INFORMATION
²Check fuse 4 in the PDC.
²Check for continuity across the stop lamp switch
when it is closed.
BACK-UP LAMPS
In the START or RUN position, the ignition switch
connects circuit A1 from fuse 6 in the Power Distri-
bution Center (PDC) to circuit A21. Circuit A21 feeds
a bus bar in the PDC that powers circuit F12
through fuse 11.
Circuit F20 supplies power to the back-up lamp
switch. On automatic transmission equipped vehicles,
the back-up lamp switch is part of an assembly that
includes the PARK/NEUTRAL position switch. When
the operator puts the transmission in REVERSE, the
back-up lamp switch connects circuit F20 to circuit
L10. Circuit L10 feeds the back-up lamps. Circuit Z1
provides ground for the back-up lamps.
HELPFUL INFORMATION
²Check fuses 6 and 11 in the PDC.
²Check for continuity across the back-up lamp
switch when it is closed.
DIAGRAM INDEX
Component Page
Back-Up Lamps........................8W-51-4, 5
Back-Up Lamp Switch.....................8W-51-2
Center High Mounted Stop Lamps (CHMSL).......8W-51-3
Fuse 15 (Fuse Block)......................8W-51-2
Fuse 4 (PDC)...........................8W-51-3
Fuse 6 (PDC)...........................8W-51-2
Fuse 7 (PDC)...........................8W-51-2
Fuse 11 (PDC)..........................8W-51-2
Headlamp Switch.........................8W-51-2
Ignition Switch..........................8W-51-2
License Plate Lamp.......................8W-51-3
Park/Neutral Position Switch.................8W-51-2
Side Marker Lamps.....................8W-51-4, 5
Stop Lamp Switch........................8W-51-3
Tail/Stop Lamps........................8W-51-4, 5
Turn Signal Lamps......................8W-51-4, 5
J8W-51 REAR LIGHTINGÐXJ VEHICLES 8W - 51 - 1
