The exterior lighting consist of the following lamps:

You can use the headlamps two different ways.

The DRL/EXT Fuse in the top underhood junction block supplies battery positive voltage at all time to the coil side of DRL relay, left low and high beam headlamps. The EXT LTS Fuse in the top underhood junction block supplies battery positive voltage at all time to the right low and high beam headlamps.

For normal manual low beam operation when the headlamp switch is placed in the HEAD position, ground is applied from G203, through the low beam contacts in the headlamp switch to the body control module (BCM).

The BCM then applies a ground to the headlamp relay control circuit. This energizes the headlamp relay in the left I/P junction block allowing ground from G201 to be applied through the switched contacts of the headlamp relay, through low beam contacts in the headlamp dimmer switch then to the left and right low beam headlamps, illuminating them.

For high beam operation the headlamp dimmer switch is placed in the HIGH position, ground is then applied from G201 through the switched contacts of the headlamp relay, through high contacts of the headlamp dimmer switch to the left and right high beam headlamps, illuminating them.

When the dimmer switch is placed in the HIGH position, the indicator lamp input to the BCM is pulled low. The BCM then sends a class 2 message to the instrument cluster in order to illuminate the high beam indicator lamp.

If the headlamp switch is left in the HEAD position, the inadvertent power control feature will turn off the headlamps after 10 minutes after you turn the ignition switch to the OFF position. If you place the headlamp switch in the head position after the ignition switch has been turned OFF, or if the ignition switch is in ACCY position, the headlamps will remain on until you turn them off or until the battery runs dead.

With the headlamps in the low beam position, you may momentarily turn ON or flash the high beams using the dimmer switch handle. When you pull the headlamp dimmer switch handle toward you, the flash-to-pass (FTP) switch closes, grounding the high beam circuit at G201. Both high beams will remain ON until you release the switch handle. If the low beam headlamps were ON during an FTP operation, the headlamps will remain ON.

The radio activates the lights on warning as requested by the body control module (BCM). The BCM sends a class 2 message to the radio indicating the chime frequency (fast rate) and duration (continuous).

The ambient light sensor is a light-sensitive transistor that varies its voltage signal to the body control module (BCM) in response to changes in the outside (ambient) light level. When the BCM receives this signal the BCM either turns on the just the low beam headlamps for the daytime running lamp (DRL) operation or turns on the low beam headlamps and the exterior lamps for automatic lamp control (ALC). Any function or condition that turns on the headlamps will cancel the DRL operation. Thirty seconds after you start the engine with the headlamp switch in the OFF position, the DRL will perform one of two actions:

The DRL/EXT Fuse in the top underhood junction block supplies battery positive voltage at all time to the coil side of DRL relay, left low and high beam headlamps. When the DRL ambient light sensor indicates a daylight condition, the BCM energizes the DRL relay allowing ground from G101 through the switched side of the DRL relay to the left and right low beam headlamps. The DRL operates when the ignition switch is in the RUN position, the parking brake is not set and the transmission is not in the PARK position When these conditions are met and the DRL ambient light sensor indicates daylight conditions the DRL will illuminate.

When the ignition switch is in the ON position and the headlamp switch is in either PARK or HEAD position, the fog lights illuminate whenever you press the fog lamp switch. The FOG RLY fuse in the top of the engine fuse block supplies battery positive voltage to both the fog lamp relay switch contacts and to the fog lamp relay coil circuit. The fog lamp relay coil is controlled by the body control module (BCM). Whenever you press the fog lamp switch, the BCM fog lamp switch input is grounded. The BCM energizes the control circuit of the fog lamp relay coil. The current flows from the fog lamp relay to both front fog lamps and to ground G101. The fog lamps remain ON until you again press the front fog lamp switch, or until you cycle the ignition switch OFF and ON. The park lamps or low beam headlamps must be ON in order for the fog lamps to be illuminated. Fog lamp operation will be cancelled whenever the park lamps are turned OFF or the high beam headlamps have been selected.

The park, tail and marker lamps, including the license lamps, turn ON when the headlamp switch is placed in either the PARK or the HEAD position, or anytime the headlamps are requested. The RT I/P #1 fuse in the RH I/P fuse block supplies battery positive voltage to both the park lamp relay switch contacts and to the park lamp relay coil circuit. The park lamp relay coil is controlled by the body control module (BCM). When the headlamp switch is placed in the PARK position, the BCM energizes the park lamp relay coil control circuit.

Current flows from the park lamp relay switch to both front and rear park lamp fuses and to their respective park/tail lamps. The front park lamps are grounded at G101. The rear park lamps are grounded at G302. The license plate lamps are a part of the rear park lamp circuit and are grounded at G302. The inadvertent power control feature prevents the park lamps from remaining on more than 10 minutes if left on. If the park lamps are turned on after the ignition switch has been turned OFF, or is in the ACCY position, they will remain on until turned off or until the battery runs dead.

A surveillance mode is available in Special Equipment Option (SEO) vehicles. The headlamps and park lamps may be disabled by using the emergency vehicle interior lamp switch.

When the remote function actuation (RFA) module receives a door unlock command from the RFA transmitter, the RFA module will perform the following tasks:

The BCM will then flash the park lamps twice. If the doors are closed when you use the remote keyless entry (RKE) transmitter in order to lock the doors, the park lamps will flash twice. The park lamps will not flash if you use the RKE transmitter in order to open the rear compartment.

The TURN SIGNAL fuse in the LH I/P fuse block supplies ignition positive voltage to the hazard and turn signal lamp flasher assembly. The HAZ SW fuse in the RH I/P accessory wiring junction block also supplies battery positive voltage to the hazard and turn signal lamp flasher assembly. The turn signal lamps may activate only when the ignition switch is in the ON or ACCY position.

When the turn signal switch is placed in either the left or right position, current flows from the flasher module's output to the turn signal switch assembly. The flasher module then sends an on-off voltage signal to either the left or the right turn signals and their instrument panel cluster (IPC) indicator. When you press the hazard switch, all the turn signal lamps and both of the IPC turn signal indicators will flash. The hazard and turn signal lamp flasher assembly is grounded at G201. The front turn signals are grounded at G101 and the rear turn signals are grounded at G302.

The radio activates the turn signal on audible warning as requested by the body control module (BCM). The BCM sends a class 2 message to the radio indicating the chime frequency (fast rate) and duration (2 seconds).

The BRAKE SW fuse in the RH I/P fuse block supplies battery positive voltage to the normally-open stop lamp switch. When you press the brake pedal the switch contacts close and battery positive voltage is supplied to the left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The left and right stop lamp along with the CHMSL are grounded at G302.

The rear window panel lamp system on Special Equipment Option (SEO) vehicles, consists of two red lensed lamps that function as auxiliary turn signal and stop lamps. The wiring necessary for the additional emergency lamps on SEO vehicles consists of battery positive voltage supplies, circuit breakers, an emergency flasher, and relays. The lamps are mounted to the rear window panel.

The rear compartment lid lamps on Special Equipment Option (SEO) vehicles, consists of two red lensed lamps that function as an auxiliary flashing warning lamp. The wiring necessary for the additional emergency lamps on SEO vehicles consists of battery positive voltage supplies, circuit breakers, an emergency flasher, and relays. The lamps are mounted on the inner trunk lid. When you raise the lid a switch closes and the lamps alternately flash.

The Spot Lamp System on Special Equipment Option (SEO) vehicles consists of either one left spot lamp (RPO 7X6), or two left and right spot lamps (RPO 7X7). The spot lamps are mounted to either the left or right hand windshield pillars and contain their own ON/OFF switch. Battery positive voltage is supplied to the spot lamps through their own respective fuses. All other wiring is blunt-ended to be used on SEO vehicles as necessary.

The surveillance mode switch turns OFF the daytime running lamps (or low beam headlamps and tail lamps during nighttime hours), instrument cluster, PRNDL and radio indicators. Interior courtesy lights are also disabled when switch is activated.

The B/U LAMP fuse in the RH I/P fuse block supplies battery positive voltage to the switch terminal of the backup lamps relay. The DIC/RKE fuse supplies battery positive voltage to the backup lamps relay coil terminal. When you place the gear selector lever in the REVERSE position, the powertrain control module (PCM) sends a class 2 message to the body control module (BCM). When these conditions occur, the BCM energizes the reverse lamp relay control circuit, closing the switch contacts, the current flows from the reverse lamp relay switch to the backup lamps. The backup lamps are grounded at G302.

The body control module (BCM) controls the lighting system through circuits that enable the park lamps, head lamps and fog lamps as well as the interior lamps. The BCM opens these enabling circuits 20 minutes after the ignition switch is turned OFF with no subsequent lamp switch activity. If the ignition switch is turned to any position other than OFF, or if a lamp switch is activated, during this 20-minute period, the timer will reset for another 20 minutes.

High Beam

The instrument panel cluster (IPC) illuminates the high beam indicator when the body control module (BCM) detects that the high beams are requested. The IPC receives a class 2 message from the BCM requesting illumination.

HIGHBEAM OUT

The IPC illuminates the HIGHBEAM OUT indicator in the message center when the body control module (BCM) detects an open in one of the highbeam lamp circuits. The IPC receives a class 2 message from the BCM requesting illumination. The HIGHBEAM OUT indicator illuminates for 60 seconds when the condition is present.

Turn Signals

The IPC illuminates the right or left turn signal indicator when the IPC detects a turn signal request or a hazard request. If the IPC determines that the turn signal is active for more than 1.2 km (0.75 mi), the IPC sends a class  2 message to the radio in order to activate an audible warning.