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110-7
120Ć3
Park, Tail, Marker, License, and Clearance Lamps
The park, tail, marker, license, and clearance (Y92
only) lamps are turned on when the headlamp switch is
placed in the PARK or ON position or anytime the
headlights are requested. The I/P BATT fuse in the
engine wiring harness junction block supplies battery
positive voltage to both the park lamp relay switch
contacts and the park lamp coil circuit. The body control
module (BCM) provides a ground or control circuit to
the park lamp relay coil circuit. When the park lamps are
turned on, the BCM energizes the park lamp relay.
Current flow is from the park lamp relay to the individual
park lamp circuit fuses and to their respective park, tail,
marker, and license lamps. The front park and marker
lamps are grounded at G107 and G103. The tail lamps
are grounded at G401 and G402. The license lamps are
grounded at G401. When equipped with the Y92 roof
rack option, the clearance lamps are grounded at
G302. If the driver places the headlight switch in the ON
position after the ignition switch has been turned OFF,
the park, tail, marker, license, and clearance lamps will
remain on until turned off or the battery runs dead.
The T PARK fuse in the rear fuse-relay block supplies
battery positive voltage to a separate park lamp circuit
connected to the trailer wiring harness.
Turn Signal Lamps
The smart flasher (GMSF) is an automotive flasher
designed to accept turn, hazard, and brake inputs. The
GMSF will provide corresponding outputs to the
exterior lamps and instrument panel turn signal
indicator lamps. This lighting system has dedicated
lamps for the turn/hazard functions and dedicated
lamps for the brake function. The system incorporates
the use of flash rates for diagnostics. The flash rate is a
calculation of the number of flashes that occur within a
60 second period. This system uses a percentage of
on-time to off-time called duty cycle. For the bulb
outage condition, the indicator of the vehicle side on
which the outage occurs shall assume bulb outage
flash rate mode. The opposite side indicator will
assume the normal flash rate mode for an input from the
non bulb outage side of the vehicle. Hazard warning
lamp outage will maintain a normal flash rate as long as
2 or more exterior signaling lamps are functional.
During all modes of operation, the IPC will receive the
same flash rates and duty cycles that the
exterior lamps receive. The IPC will then control the
indicators in the cluster. The vehicle operator will be
provided with an audible and visual indication of the
flasher operation. Below is a table with flash rates and
duty cycles:
The IGN E fuse in the engine wiring harness junction
block supplies Ignition positive voltage to the turn signal
switch assembly. With the ignition switch in the RUN or
START position, ignition positive voltage is connected
through the turn signal and hazard switch assembly to
the GMSF which is powered by the FLASHER fuse also
in the engine wiring harness junction block and is
grounded at G201. When the turn signal switch is
placed in either the left or right position, the circuit is
complete from the GMSF to the turn signal lamps and to
ground. The GMSF then sends an on-off voltage signal
to either the left or right turn signals and their instrument
panel cluster (IPC) indicator. When the hazard switch is
pressed, all turn signal lamps will flash including both
IPC turn indicators. The front turn signals are grounded
at G103 and G107. The rear turn signals are grounded
at G401 and G402.
The IPC illuminates the TURN SIGNAL ON indicator in
the driver information center when the IPC determines
that the turn signal is active for more than 1.2 km (0.75
mile). The IPC also sends a class
2 message to the
radio in order to activate the audible warning.
On vehicles equipped with the outside rear view mirror
turn signal lamps, the turn signal voltage is also sent to
the respective front door module. The door modules
then distribute power and ground to the activated lamp.
For trailer wiring, separate turn signal circuits are
connected through the GMSF to the trailer wiring
harness.
Circuit Operation
Operating
Condition
Flash Rate
Duty Cycle
Normal
Turn Signal
Lamp Outage
75 to 105 flashes
per minute
2 or 3 times fast-
er than normal
flash rate
45% to 55%
35% to 55%
PARK, TURN/HAZARD, MARKER, LICENSE, BACK-UP AND
BRAKE LIGHTS
110-8
120Ć3
Cornering Lamps
The turn signal switch sends battery positive voltage to
the cornering lamps which will constantly remain
illuminated until turn signal operation is cancelled. The
cornering lamps are grounded at G103 and G107.
Stop Lamps
The STOP fuse in the engine wiring harness junction
block supplies battery positive voltage to the normally
open stop lamp switch. When the driver presses the
brake pedal, the switch contacts close and battery
positive voltage is supplied to both the VEHICLE STOP
fuse and the VEHICLE CHMSL fuse. The current flow is
now to the stop lamps which are grounded at G401 and
G402. The center high mounted stop lamp (CHMSL) is
grounded at G401.
For trailer wiring, a separate stop lamp circuit is
connected through the GMSF to the trailer wiring
harness.
Backup Lamps
On a vehicle equipped with an automatic transmission,
the backup lamps request signal is sent from the
powertrain control module (PCM) to the body control
module (BCM) via class 2. This signal is based on the
state of the park neutral position (PNP) switch. On a
manual transmission equipped vehicle, the B/U fuse in
the engine wiring harness junction block supplies
battery positive voltage to the normally open backup
lamp switch. When the driver places the gear selector
lever is in the REVERSE position, the backup lamp
switch closes and the current flow is from the backup
lamp switch to the BCM signaling for backup lamp
illumination.
The BCM directly supplies voltage for backup lamp
operation on both automatic and manual transmission
vehicles. The backup lamps are grounded at G401 and
G402 (G305 on vehicles that have the backup lamps
located in the lower bumper facia).
For trailer wiring, a separate backup lamp circuit is
connected through the TRLR B/U fuse to the trailer
wiring harness.
Circuit Operation
PARK, TURN/HAZARD, MARKER, LICENSE, BACK-UP AND
BRAKE LIGHTS
110-9
PARK, TURN/HAZARD, MARKER, LICENSE, BACK-UP AND
BRAKE LIGHTS
(Refer to Section 201 for photographs.)
Component
Photo No.
Body Control Module
(BCM)
On Rear Fuse Block, under left rear seat
53
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Center High Mount Stoplamp
(CHMSL)
At the top center of liftgate exterior
107
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Door Module (DDM)
On lower part of the driver door switch panel
95
. . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Passenger Door Module
(FPDM)
On lower part of passenger door switch panel
96
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block-Rear
Under the left rear seat
52
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block-Underhood
Left side of engine compartment
3
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlamp Switch
On the left side of the IP
61
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Panel Cluster
(IPC)
On the left side of the IP, above the steering column
59
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
Park/Neutral Position (PNP)
Switch
Left side of transmission
40
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powertrain Control Module
(PCM) (4.2L)
Left front of engine
5
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powertrain Control Module
(PCM) (5.3L)
Left front of engine compartment
25
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SP201
Near right front of lower console
80
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stop Lamp Switch
On brake pedal support
64
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tail Lamp Assembly-Left
At the left rear of the vehicle
112
. . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tail Lamp Assembly-Right
At the right rear of the vehicle
112
. . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turn Signal/Hazard Flasher
Module
Below the left side of I/P
57
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turn Signal/Multifunction
Switch
On the stalk, on the left side of the steering column
71
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . .
Connector
C101 (38-BLK)
Left side of engine compartment
3
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C201 (17-BLK), (18-BLK),
and (13-GRY)
At base of steering column
120
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C500 (12-BLK)
Midpoint of leading edge of left front door
93
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C600 (12-BLK)
Midpoint of leading edge of right front door
93
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C900 (6-BLK)
Top of the liftgate
107
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C901 (2-GRY)
Inside the liftgate
113
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trailer Connector
Below the center of the rear bumper
116
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ground
G102
Left side of engine compartment
4
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G103
Right rear of engine compartment
15
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G107 (4.2L)
Lower left side of engine
37
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G107 (5.3L)
Lower left side of engine
38
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G108 (4.2L)
Lower left side of engine
37
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G108 (5.3L)
Lower left side of engine
38
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G201
Near right front of lower consol
80
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G305
Outside of left frame rail, near fuel tank
36
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G401
On lower left D-pillar
109
. . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G402
On lower right D-pillar
111
. . . . . . . . . . . . . . . . . . . . . .
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Component Location Index
114
INTERIOR LIGHTS
Body Control Module (BCM)
Cargo Lamp
Courtesy/Reading Lamp-Left Center
Courtesy/Reading Lamp-Left Front
Courtesy/Reading Lamp-Left Rear
Courtesy/Reading Lamp-Right Center
Courtesy/Reading Lamp-Right Front
Courtesy/Reading Lamp-Right Rear
Driver Door Module (DDM)
Front Passenger Door Module (FPDM)
Fuse Block-Rear
Headlamp Switch
Liftgate Ajar Switch
Liftgate Module (LGM)
Miniwedge (Door Jamb Switch)-Driver
Miniwedge (Door Jamb Switch)-Front Passenger
Miniwedge (Door Jamb Switch)-Left Rear
Miniwedge (Door Jamb Switch)-Liftgate
Miniwedge (Door Jamb Switch)-Right Rear
SP201
Vanity Mirror Lamp-Left Front
Vanity Mirror Lamp-Right Front
Component Index
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