The exterior lighting consist of the following lamps and systems:

The headlamps may be turned on two different ways. First, when the driver places the headlamp switch in the HEAD position, for manual operation. Second, with the headlamp switch placed in the OFF position, for automatic lamp control (ALC). During low light conditions the daytime running lamps (DRL) control module will illuminate the automatic headlamps.

The fusible link Z , supplies battery voltage to the headlamp switch. When the headlamp switch is moved to the Head position, battery positive voltage is supplied to the headlamp dimmer switch. Depending on the position of the headlamp dimmer switch, battery voltage is then supplied to the high or low beam headlamps.

G 106 supplies the ground to the left headlamps. G 105 supplies the ground to the right headlamps.

The headlamps illuminate when the driver places the headlamp switch in the HEAD position. The low beam headlamps will always illuminate whenever the headlamp switch is in the HEAD position, regardless of the headlamp dimmer switch position. The high beams will illuminate when the headlamp dimmer switch is in HIGH.

The fusible link Z , supplies battery voltage to the headlamp switch. When the headlamp switch is moved to the Head position, battery positive voltage is supplied to the low beam headlamps and the headlamp dimmer switch. When the headlamp dimmer switch is in the HIGH position, battery voltage is then supplied to the high beam headlamps.

G 106 supplies the ground to the left headlamps. G 105 supplies the ground to the right headlamps.

The headlamps may be turned on two different ways. First, when the driver places the headlamp switch in the HEAD position, for manual operation. Second, with the headlamp switch placed in the OFF position, for automatic lamp control (ALC). During low light conditions the daytime running lamps (DRL) control module will illuminate the automatic headlamps .

The low beam headlamps will always illuminate whenever the headlamp switch is in the HEAD position or the ALC are on, regardless of the headlamp dimmer switch position. The high beams will illuminate only when low beam headlamps are illuminated and the headlamp dimmer switch is in the HIGH position.

During manual operation the fusible link Z , supplies battery voltage to the headlamp switch. When the headlamp switch is moved to the Head position, battery positive voltage is supplied to the low beam headlamps and the headlamp dimmer switch. When the headlamp dimmer switch is in the HIGH position, battery voltage is then supplied to the high beam headlamps.

G 106 supplies the ground to the left headlamps. G 105 supplies the ground to the right headlamps.

The headlamps can turn on two different ways. First, when the driver places the headlamp switch in the HEAD position, for manual operation. Second, with the headlamp switch placed in the OFF position and the ignition in the RUN position, for daytime running lamp (DRL) operation. Only the low beam headlamps will illuminate during DRL operation.

During manual operation the fusible link Z , supplies battery positive voltage to the headlamp switch. When the headlamp switch is moved to the HEAD position, battery positive voltage is supplied to the headlamp dimmer switch. Depending on the position of the headlamp dimmer switch, either the low beams or high beams will illuminate. Battery voltage is applied to the Auxiliary Headlamp Fuses 1 and 3 when in the low beam position or the Auxiliary Headlamp Fuses 2 and 4 when in the high beam position.

G 106 supplies the ground to the left headlamps. G 105 supplies the ground to the right headlamps.

The headlamps illuminate when the driver places the headlamp switch in the HEAD position.

The fusible link Z , supplies battery positive voltage to the headlamp switch. When the headlamp switch is moved to the HEAD position, battery positive voltage is supplied to the headlamp dimmer switch. Depending on the position of the headlamp dimmer switch, either the low beams or high beams will illuminate.

G 106 supplies the ground to the left headlamps. G 105 supplies the ground to the right headlamps.

The headlamps illuminate when the driver places the headlamp switch in the HEAD position.

The fusible link Z , supplies battery positive voltage to the headlamp switch. When the headlamp switch is moved to the HEAD position, battery positive voltage is supplied to the headlamp dimmer switch. Depending on the position of the headlamp dimmer switch, either the low beams or high beams will illuminate. Battery voltage is applied to the Auxiliary Headlamp Fuses 1 and 3 when in the low beam position or the Auxiliary Headlamp Fuses 2 and 4 when in the high beam position.

G 106 supplies the ground to the left headlamps. G 105 supplies the ground to the right headlamps.

This feature provides a method for leveling the headlamp beams. The headlamp leveling switch provides 4 headlamp leveling positions. The switch controls headlamp leveling actuators which are mounted under each headlamp assembly.

The headlamp leveling switch is a variable resistor which changes voltage on the headlamp leveling switch bit 2 signal circuit. A processor inside each actuator interprets the voltage signal, and the processor commands the actuator motors to adjust the headlamp position.

The headlamp switch supplies voltage to the motors and the leveling switch when the headlamp switch is placed in the HEAD position. The motors are grounded at G105 or G106. The headlamp leveling switch is grounded at G200.

The headlamp doors are designed to open when you turn the headlamps on and close when you turn the headlamps and park lamps off. The headlamp doors can remain opened without the headlamps being illuminated. By turning the headlamps on, then turning the headlamp switch to the PARK position the headlamp doors will remain open.

Battery voltage is constantly applied to the headlamp door control module from the LH HDLP DR fuse and from the RH HDLP DR fuse. When the headlamp switch is turned to the HEAD position, headlamp supply voltage and park lamps supply voltage is applied to the headlamp door control module. The headlamp door control module supplies battery voltage and a ground path to each headlamp door motor, opening the headlamp doors. When the headlamp switch is moved to the OFF position, the headlamp control module reverses polarity of the headlamp door motor circuits, closing the headlamp doors. The headlamp door control module will not close the doors if the park lamps are on. The headlamp control module is grounded by G106.

The daytime running lamps (DRL) are the front turn signals. The front turn signals are designed to automatically illuminate in daytime light conditions.

The ambient light sensor is a light sensitive transistor that varies its voltage signal to the daytime running lamps (DRL) control module in response to changes to the outside (ambient) light level. When the DRL module receives this signal it will either turn on the daytime running lamps (DRL) or the automatic headlamps depending on the ambient light level. When the daytime running lamps (DRL) control module detects daylight conditions, it will turn on the front turn signals.

In daylight conditions, the ambient light sensor detects daylight and the DRL control module applies voltage to the LH and RH front turn signal lamps illuminating the lamps under the following conditions:

The DRL control module will not operate the daytime running lamps, if the park brake is applied before the ignition switch is turned to the RUN position. This allows the driver to start the vehicle and keep the daytime running lamps OFF, as long as the park brake is applied. The DRL control module will activate the daytime running lamps when the park brake is released with the ignition switch in the RUN position. This feature functions only when the park brake is applied before the ignition switch is turned to the RUN position.

When the turn signal switch place in either the LH or RH position, pulsating voltage is supplied to the DRL control module. The DRL control module senses the voltage and disengages the DRL function of the appropriate front turn signal. The DRL control module then relays the turn signal voltage to the front turn signal and the front turn signal will flash .

The Daytime Running Lamps (DRL) are the front turn signals. The front turn signals are designed to automatically illuminate under the following conditions:

The DRL control module will not operate the daytime running lamps, if the park brake is applied before the ignition switch is turned to the RUN position. This allows the driver to start the vehicle and keep the daytime running lamps OFF, as long as the park brake is applied. The DRL control module will activate the daytime running lamps when the park brake is released with the ignition switch in the RUN position. This feature functions only when the park brake is applied before the ignition switch is turned to the RUN position.

When the turn signal switch place in either the LH or RH position, pulsating voltage is supplied to the DRL control module. The DRL control module senses the voltage and disengages the DRL function of the appropriate front turn signals. The DRL control module then relays the turn signal voltage to the front turn signal and the front turn signal will flash.

The daytime running lamp (DRL) control module for the Pontiac is the same DRL control module that is used for the Chevrolet Domestic. The associated wiring is also the same as the Chevrolet Domestic with the exception of the elimination of the ambient light sensor. The ambient light sensor circuits are present but, the ambient light sensor is replaced by a jumper. The jumper simulates the state of an ambient light sensor in daytime conditions. When the DRL module receives this signal it will turn on the daytime running lamps (DRL). For more information on the DRL control module operation refer to Daytime Running Lamps (DRL) -- Chevrolet Domestic, Gulf, Pontiac Canadian.

The daytime running lamps (DRL) will illuminate when the ignition is in RUN and the headlamp switch is in the OFF position. The daytime running lamps consist of the low beam headlamps and the park lamps.

When the ignition is in the RUN position and the headlamp switch is in the OFF position, ignition voltage from the headlamp switch is applied to the park lamps, illuminating the park lamps.

Battery positive voltage is supplied to the switch side of the DRL relay from the headlamp switch when the headlamp switch is in the OFF position. The DRL relay coil is permanently grounded at G 106. When the ignition is placed in the RUN position, ignition voltage is supplied to the coil of the daytime running lamp DRL relay, energizing it . The DRL relay switch contacts close and battery positive voltage is then supplied to the auxiliary headlamp fuses 1 and 3, illuminating the low beam headlamps.

The automatic headlamps and park lamps are designed to automatically illuminate when the ignition is RUN and the outside (ambient) light level is low, as in nighttime conditions. Light levels are detected by the ambient light sensor, a light sensitive transistor that varies its voltage signal to the daytime running lamp (DRL) control module in response to changes to the ambient light level. When the DRL control module receives a low light signal from the ambient light sensor, it will then turn on the headlamps and park lamps and turn off the daytime running lamps.

When the ambient light sensor detects low light levels, the DRL control module turns OFF the daytime running lamps and turns on the headlamps and park lamps under the following conditions:

If the engine stalls with the DRL control module in the low light mode, the DRL control module turns OFF the headlamps while the engine is being cranked. The park lamps will remain ON while the engine is being cranked.

The fog lamps can be turned on by the fog lamp switch only when the parking lamps are on and the high beam headlamps are off.

The headlamp switch supplies battery positive voltage to the fog lamp switch and the fog lamp relay contacts, when the headlamp switch is in the PARK or HEAD position. The fog lamp relay coil is grounded thought the inactive high beam headlamps. When the fog lamp switch is place in the ON position, battery positive voltage is applied to the coil side of the fog lamp relay, energizing it. When the fog lamp relay energizes, the relay contacts close and it supplies battery positive voltage to fog lamps. The fog lamps are grounded at G 105 and G 106.

The fog lamps will remain ON until any of the following actions occurs:

The fog lamp switch indicator illuminates when the fog lamp switch is in the on position and the park lamps are on. The indicator receives battery positive voltage from the fog lamp switch when the switch is in the ON position. The indicator is grounded at all times.

For the Pontiac, the fog lamp switch indicator illuminates when the fog lamp switch is in the on position and the park lamps are on also, but the Pontiac fog lamp switch indicator receives battery positive voltage from the fog lamps supply voltage circuit when the fog lamps illuminate. The indicator is grounded at all times.

The fog lamps can be turned on by the fog lamp switch only when the parking lamps are on.

The headlamp switch supplies battery positive voltage to the fog lamp switch and the fog lamp relay contacts, when the headlamp switch is in the PARK or HEAD position. The fog lamp relay coil is permanently grounded to G106. When the fog lamp switch is place in the ON position, battery positive voltage is applied to the coil side of the fog lamp relay, energizing it. When the fog lamp relay energizes, the relay contacts close and it supplies battery positive voltage to fog lamps. The fog lamps are grounded at G 105 and G 106. The fog lamps will remain ON until the front fog lamp switch is placed in the OFF position, or the headlamp switch is placed in the OFF position.

The fog lamp switch indicator illuminates when the fog lamp switch is in the on position. The indicator receives battery positive voltage from the fog lamp switch when the switch is in the ON position. The indicator is grounded at all times.

The rear fog lamps can be turned on by the rear fog lamp switch only when the headlamp switch is in the HEAD position or when both of the following conditions are present :

The headlamp switch supplies battery voltage to the rear fog lamp relay contacts when in the headlamp switch is in the PARK or HEAD position. The fog lamp relay coil receives battery voltage from 2 sources. First, from the front fog lamp switch when the front fog lamp switch is in the ON position. Second, from the headlamp switch when the headlamp switch is in the HEAD position.

When the rear fog lamp switch is placed in the ON position it sends a ground signal to the body control module (BCM). When the BCM receives the fog lamp switch signal, the BCM will then pull low the rear fog lamp relay, energizing it.

When the rear fog lamp relay energizes, the relay contacts close and it supplies battery positive voltage to rear fog lamps. The fog lamps are grounded at G 105 and G 106.

The fog lamps will remain ON until one of the following actions occur:

The rear fog lamp switch indicator illuminates when it receives battery voltage from the rear fog lamps supply voltage circuit, during rear fog lamps illumination. The indicator is grounded at all times.

The parking lamps include all of the following lamps:

The park lamps are turned on when the headlamp switch is placed in either the PARK or HEAD position, or when the automatic park lamps are requested. Automatic park lamp operation excludes Pontiac domestic. The TAIL LPS fuse in the IP fuse block, supplies battery positive voltage to headlamp switch. When the headlamp switch is placed in the PARK position, current flows from the headlamp switch to all the park lamps. The front park lamps and marker lamps are grounded at G105 and G106. The rear maker lamps, tail lamps, and license lamps are grounded at G400.

The parking lamps include all of the following lamps:

The park lamps are turned on when the headlamp switch is placed in either the PARK or HEAD position. The TAIL LPS fuse in the IP fuse block, supplies battery positive voltage to headlamp switch. When the headlamp switch is placed in the PARK position, current flows from the headlamp switch to the tail lamps, license lamps, and the turn signal switch. The tail lamps and the license lamps illuminate. When the turn signal switch receives the battery voltage, and the turn signal switch is in the OFF position, battery voltage will then be applied to the front park lamps. The front park lamps are grounded at G105 and G106. The tail lamps, and license lamps are grounded at G400.

The parking lamps include all of the following lamps:

The park lamps are turned on only when the headlamp switch is placed in either the PARK or HEAD position, Europe only.

The park lamps may be turned on 2 different ways, Scandinavia only. First, when the driver places the headlamp switch in the PARK or HEAD position, for manual operation. Second, with the headlamp switch placed in the OFF position and the ignition switch is in the RUN position for DRL operation. DRL does not apply to Europe.

For both vehicles the TAIL LPS fuse in the IP fuse block, supplies battery positive voltage to headlamp switch. When the headlamp switch is placed in the PARK or HEAD position. Current flows from the headlamp switch to the license lamps, marker lamps and the auxiliary tail lamp fuse holders. Current then flows from the auxiliary tail lamp fuse holders to the tail lamps. The tail lamps, marker lamps, and license lamps are grounded at G400.

When the remote function actuation (RFA) module receives a door unlock command from the remote function actuator transmitter, the RFA module will ground the door unlock signal circuit to the BCM indicating that an UNLOCK command has been received. The BCM will then flash the park lamps twice. With all the doors closed, and the RKE transmitter is used to lock the doors, the park lamps will flash twice. The park lamps will not flash if the rear compartment is opened using the RKE transmitter.

The turn signal lamps may only be activated with the ignition switch in RUN position. The TURN BU fuse supplies ignition voltage to the turn signal flasher module. When the turn signal switch is placed in either the left or right position, the turn signal flasher module sends an on-off voltage signal to the turn signal switch, which sends the on-off signal to the appropriate Instrument Cluster Panel (IPC) indicator and to the daytime running lamps DRL control module, which relays the signal to the appropriate front turn signal. The turn signal switch also sends a separate on-off signal to the appropriate rear turn signal. The front turn signals are grounded at G105 and G106. The rear turn signals are grounded at G400.

The Pontiac rear turn signals consist of the inboard stop/turn lamps and the outboard stop/turn lamps. These lamps also function as stop lamps. The turn signal switch receives the battery voltage from the stop lamp switch when the brake pedal is pressed and applies the voltage to the inboard stop/turn lamps and the outboard stop/turn lamps. The inboard stop/turn lamps and the outboard stop/turn lamps function as stop lamps only when the turn signal switch is in the OFF position. The operation of the turn signal switch overrides the stoplamp function.

The hazard lamps operate on battery voltage. The STOP HAZARD fuse supplies battery voltage the hazard flasher module. When the hazard switch is pressed, the hazard flasher module sends an on-off voltage signal to the turn signal switch, which sends the on-off signal to the all the turn signal lamps and turn signal indicators.

The turn signal lamps may only be activated with the ignition switch in RUN position. The TURN BU fuse supplies ignition voltage to the turn signal flasher module. When the turn signal switch is placed in either the left or right position, the turn signal flasher module sends an on-off voltage signal to the turn signal switch, which sends the on-off signal to the following LH or RH lamps:

The turn signal switch also sends a separate on-off signal to the park lamp element of the park/turn lamp. The park/turn lamp is a single bulb with duel elements, that receives two separate on-off signals from the turn signal switch. The first signal is received on the turn signal element of the park/turn lamp. The second signal is received on the park lamp element of the park/turn lamp.

The park lamp element of the park/turn lamp normally operates as a park lamp. The headlamp switch sends park lamp supply voltage to the turn signal switch. When the turn signal switch is in the OFF position, it sends the park lamp supply voltage to the park lamp element of the park/turn lamp. When the turn signal switch is placed either the left or right position, the park lamp element of the park/turn lamp no longer receives park lamp supply voltage but, receives the on-off signal of turn signal switch. Both of the elements of the park/turn lamp bulb flash when the turn signal switch is activated.

The front turn signals are grounded at G105 and G106. The rear turn signals are grounded at G400.

The hazard lamps operate on battery voltage. The STOP HAZARD fuse supplies battery voltage the hazard flasher module. When the hazard switch is pressed, the hazard flasher module sends an on-off voltage signal to the turn signal switch, which sends the on-off signal to the all the turn signal lamps and turn signal indicators.

The turn signal lamps may only be activated with the ignition switch in RUN position. The TURN BU fuse supplies ignition voltage to the turn signal flasher module. When the turn signal switch is placed in either the left or right position, the turn signal flasher module sends an on-off voltage signal to the turn signal switch, which sends the on-off signal to the following lamps:

The turn signal switch also sends a separate on-off signal to the appropriate rear turn signal. The front turn signals are grounded at G105 and G106. The rear turn signals are grounded at G400.

The hazard lamps operate on battery voltage. The STOP HAZARD fuse supplies battery voltage the hazard flasher module. When the hazard switch is pressed, the hazard flasher module sends an on-off voltage signal to the turn signal switch, which sends the on-off signal to the all the turn signal lamps and turn signal indicators.

The Stop/Hazard fuse in the IP fuse block supplies battery positive voltage to the stop lamp switch. When the driver presses the brake pedal, the normally open switch closes and battery positive voltage is supplied to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The stop lamps are grounded at G 400. The CHMSL is grounded at G 400 for the convertible and at G 310 for the coupe.

The Stop/Hazard fuse in the IP fuse block supplies battery positive voltage to the stop lamp switch. When the driver presses the brake pedal, the normally open switch closes and battery voltage is supplied to the center high mounted stop lamp (CHMSL) and to the turn signal switch. The turn signal switch sends the battery voltage to both inboard stop/turn lamps and both outboard stop/turn lamps, when the turn signal switch is in the OFF position. The stop lamps are grounded at G 400. The CHMSL is grounded at G 400 for the convertible and at G 310 for the coupe.

The Turn B/U fuse in the IP fuse block supplies ignition voltage to backup lamp switch. When the transmission is place in reverse, the backup lamp switch closes suppling ignition voltage to the backup lamp assemblies. The backup lamps are grounded at G 400.

The Turn B/U fuse in the IP fuse block supplies ignition voltage to park/neutral position (PNP) switch. When the transmission is place in reverse, the park/neutral position (PNP) switch closes suppling ignition voltage to the backup lamp assemblies. The backup lamps are grounded at G 400.

High Beam

The IPC illuminates the high beam indicator when the headlamps are on and the headlamp dimmer switch is in the high beam position.

Turn Signals

The IPC illuminates the right or left turn signal indicator when the IPC detects a turn signal request or a hazard request.