Exterior Lamps

LAMPS/LIGHTING - EXTERIOR

WARNING: To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment.

NOTE: When diagnosing the exterior lighting circuits, remember that high generator output can burn out bulbs rapidly and repeatedly; and, that dim or flickering bulbs can be caused by low generator output or poor battery condition. If one of these symptoms is a problem on the vehicle, be certain to diagnose the battery and charging system, then repair as necessary.

NOTE: A good ground is necessary for proper lighting operation. If a lighting problem is being diagnosed that involves multiple symptoms, systems, or components, the problem can often be traced to a loose, corroded, or open ground.

The lamps and the hard wired circuits between components related to the exterior lighting system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the electronic controls or communication between modules and other devices that provide some features of the exterior lighting system. The most reliable, efficient, and accurate means to diagnose the exterior lighting system or the electronic controls and communication related to exterior lighting system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

BACKUP LAMPS





BRAKE LAMPS





DAYTIME RUNNING LAMPS

NOTE: Before performing the following tests, determine whether the headlamp low and high beams operate. If the headlamp low and high beams are also ineffective, diagnose and repair that problem before attempting to repair the Daytime Running Lamps.






FRONT FOG LAMPS

NOTE: The front fog lamps are designed to operate ONLY while the headlamp low beams are illuminated. If the headlamp low beams do not illuminate, diagnose and repair that problem before attempting to repair the front fog lamp system. Refer to the appropriate diagnostic information.






HAZARD WARNING LAMPS

NOTE: The hazard switch is integral to the upper instrument panel switch pod, which provides a hard wired output to the TIPM. Before performing any of the following tests, confirm whether the left and right turn signals operate satisfactorily. Then determine whether the other functions of the upper instrument panel switch pod are operational. If the turn signals are ineffective or operate improperly, or if the other instrument panel switch pod functions are ineffective, diagnose and repair those problems before attempting to repair the hazard warning lamps system.






HEADLAMPS

NOTE: As part of the exterior lighting fail-safe feature, upon ignition ON all exterior park lamps and the headlamp low beams will illuminate regardless of the headlamp switch position if the EMIC (CCN) cannot detect an input from the headlamp switch, or if there is a loss of data bus communication. Diagnose and repair those problems before attempting to repair the headlamp system. The TIPM will store a Diagnostic Trouble Code (DTC) for an open or shorted headlamp circuit. In addition, for automatic headlamps the air conditioning - heater control must be able to receive the hard wired input from the sun sensor on the top of the instrument panel and must be able to communicate with the TIPM over the CAN data bus. Refer to the appropriate diagnostic information.











PARK LAMPS

NOTE: As part of the exterior lighting fail-safe feature, upon ignition ON all exterior park lamps and the headlamp low beams will illuminate regardless of the headlamp switch position if the instrument cluster cannot detect an input from the headlamp switch, or if there is a loss of data bus communication between the EMIC (CCN) and the TIPM. Diagnose and repair those problems before attempting to repair the Park Lamps.






TURN SIGNAL LAMPS

NOTE: The turn signal switch is integral to the multi-function switch/SCM, which communicates with the EMIC/CCN over the LIN data bus. Before performing any of the following tests, determine whether the other functions of the multi-function switch/SCM are operational. If the other multi-function switch/SCM functions are ineffective, diagnose and repair that problem before attempting to repair the Turn Signal Lamps.