Exterior Lighting

EXTERIOR LIGHTING

Headlamps

NOTE: The smart junction box (SJB) must be configured before installing a new module.

The headlamps are controlled by the SJB. The headlamp and multifunction switches are hard-wired to the SJB and are constantly monitored. The SJB processes information (such as low beam, high beam or flash-to-pass requests) from these switches and outputs the appropriate command to the headlamps (which are also hard-wired to the SJB). Fault management of the headlamps provides some headlamp functionality. In the event of a headlamp switch failure, the exterior lamps are illuminated. There is also a headlamp battery saver feature. This feature turns off the headlamps 10 minutes after the ignition switch is turned OFF.

Autolamps and daytime running lamps (DRL) are 2 functions which may be configured in the SJB.

Autolamps

NOTE: For additional information on the perimeter lighting feature, refer to Locks.

The autolamps are controlled by the headlamp switch, light sensor and the SJB. When the headlamp switch is in the AUTOLAMPS ON position, the SJB monitors input from the light sensor. The SJB processes this information and outputs the appropriate command to the exterior lamps. The autolamps remain on for a preselected amount of time (approximately 20 seconds to 3 minutes depending on customer preferences) after the ignition switch is changed from the ON position to the ACC or OFF position. The exit time delay is programmed in the following sequence.

NOTE: Steps 2 through 5 must be carried out within a 10-second period.

1. Make sure the ignition switch is turned OFF and the headlamp switch is in the AUTOLAMPS ON position.
2. Place the headlamp switch to the OFF position.
3. Turn the ignition switch to the RUN position.
4. Turn the ignition switch to the OFF position.
5. Place the headlamp switch to the AUTOLAMPS ON position (at this time the headlamps and parking lamps illuminate).
6. When the desired length of time is reached (maximum of 3 minutes), place the headlamp switch to the OFF position.

Turn Signal and Hazard Lamps
All turn signal outputs are controlled by the SJB. The multifunction switch and the hazard lamp switch are hard-wired to the SJB. When the multifunction switch is in the LH or RH TURN position, or the hazard lamp switch is engaged, the SJB processes this information and outputs the appropriate command to the turn signal lamps. All turn signal lamps provide a lamp outage indication.

Parking, Rear or License Lamps
All parking, rear, license plate and side marker lamps are controlled by the SJB. The headlamp switch is hard-wired to the SJB. When the headlamp switch is in the HEADLAMPS ON or PARKING LAMPS ON position, the SJB processes this information and outputs the appropriate command to the parking or license plate lamps, which are hard-wired to the SJB.

Fog Lamps
The fog lamps are controlled by the headlamp switch, the SJB and the fog lamp relay. When activated, the switch sends a signal to the SJB. The SJB then activates the fog lamp relay, providing power to the fog lamps. The fog lamps will not illuminate when the high beam headlamps are on.

Reversing Lamps
The reversing lamps are controlled by the SJB and the powertrain control module (PCM). The PCM sends a message through the communication network indicating the transmission is in REVERSE. The SJB processes this information and provides voltage to the reversing lamps which are hard-wired to the SJB.