Backup Lights Circuit Description; Interior Lights Circuit Description - GMC Chevrolet Camaro 1998 Service Manual

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Body and Accessories
Rear Park/Turn, Rear Side Marker, Tail and
License Plate Lamps
Voltage is applied at all times from the TAIL LPS fuse
to the headlamp switch and the Daytime Running
Lamps (DRL) module through circuit 240. Voltage is
applied to circuit 9 when the headlamp switch is in the
PARK or the HEAD position. Voltage then flows to
all rear park/turn, rear side marker, tail and license
plate lamps, turning then on.
Turn Signal Lamps
Voltage is applied from the TURN B/U fuse to the
normally closed pole of the hazard switch in the turn
signal switch when the ignition is in the RUN position.
The voltage then flows through circuit 141, which
feeds the turn signal lamp flasher. With the turn signal
switch in the turn left position, voltage is applied
through 2 circuits. Voltage flows through the turn signal
switch circuit 1414 at terminal H of harness
connector C216 and circuit 18 at terminal M of C216.
For circuit 1414, voltage flows through circuit 1414
to the instrument cluster for the left turn indicator, and
to the daytime running lamps module. Voltage then
flows through circuit 14 to the left front turn
signal lamp.
For circuit 18, voltage flows through circuit 18 to the
left rear turn signal lamp. Current flow heats the timing
element in the hazard lamp/turn signal flasher. The
timing element continuously opens and closes
the circuit for the right turn signal lamps, circuit 1415
terminal J of C216 and circuit 19 terminal N of C216.
Tail/StopfTurn Lamps
Voltage is applied when the ignition is in the RUN
position through the TURN B/U Fuse in the fuse block,
to the turn signal lamp flasher through circuit 141.
Then voltage is applied from the flasher to the
turn/hazard switch through circuit 16. When the turn
signal switch is placed in the TURN LEFT position,
voltage is applied through the close9 contacts of the
turn signal switch, to the LH tail/stop/turn lamp through
circuit 18. The LH tail/stop/turn lamp is grounded
through circuit 1250. When the turn signal switch is
placed in the TURN RIGHT position, voltage is applied
through the closed contacts of the turn signal switch,
to the RH tail/stop/turn lamp through circuit 19. The RH
tail/stop/turn lamp is grounded through circuit 1250.
Hazard Lamps
Voltage is applied at all times from the STOP/HAZARD
fuse to the hazard lamp flasher through circuit 140.
The current flow heats the timing element in the hazard
lamp flasher. The voltage continuously opens and
closes circuit 27 to the turn/hazard switch and then to
all the turn signal lamps and both of the turn telltale
lamps. All of the turn signal lamps and both of the turn
telltale lamps flash on and off.
Lighting Systems 8-159
Stop Lamps
Voltage is applied at all times from the STOP/HAZARD
fuse to the stop lamp switch through circuit 140.
Voltage is applied from the stop lamp switch to the
turn/hazard switch through circuit 20 When the
brake pedal is depressed. The voltage turns on the
left and the right tail/stop/turn signal lamps and
the center high mounted stop lamp.
Backup Lights Circuit Description
With the ignition switch in the RUN position, voltage is
applied through the TURN B/U Fuse 2 to the backup
lamp switch (manual transmission) or the transmission
range switch (automatic transmission) through
circuit 141. When either transmission is shifted into
reverse, voltage is applied through circuit 24 to
the backup lamps turning them on provided they have
ground circuit 1250.
Interior Lights Circuit Description
Circuit Operation
Body Control Module
The body control module (BCM) controls the interior
lights based on inputs it receives from the following
switches:
• Right and left side door lock, or right and left door
jamb switches
• 1/P dimmer switch
• Rear compartment lie;! ajar indication switch
Dome Lamp, Courtesy Lamps and
Reading Lamps
Voltage is applied through circuit 149 from the BCM
to the following lamps on coupes:
• Dome
• Inside rearview mirror courtesy/reading lamps
Voltage is applied through circuit 149 from the BCM
to the following lamps on convertibles:
• Right and left rear courtesy lamps
• Rear compartment lamp
• Inside rearview mirror courtesy/reading lamps
The BCM provides a ground through circuit 156 and
the lamps illuminate when actions occur:
• The driver door is opened
• The rear compartment is opened
• The 1/P dimmer switch is moved to the on position
• The vehicle is unlocked using the keyless entry
function
The inside rearview mirror contains switches which
provide ground through circuit 750 to allow manual
operation of the reading lamps.