LAMPS/LIGHTING - EXTERIOR
WARNING:
To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental restraint system before attempting any steering wheel, steering column, airbag,
occupant classification system, 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 supplemental restraint system. 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 exterior lighting system or 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
CONDITION
|
POSSIBLE CAUSES
|
CORRECTION
|
BACKUP LAMP DOES NOT ILLUMINATE
|
1. Ineffective or missing fuse.
|
1. Test and replace backup lamp fuse if required.
|
2. Ineffective or missing bulb.
|
2. Test and replace backup lamp bulb if required.
|
|
3. Ineffective ground circuit.
|
3. Test and repair open backup lamp ground circuit if required.
|
|
4. Ineffective feed circuit.
|
4. Test and repair open back-up lamp feed circuit if required.
|
|
5. Ineffective switch.
|
5. Test and replace backup lamp switch (manual transmission) or transmission range sensor (automatic transmission) if required.
|
|
BACKUP LAMP DOES NOT EXTINGUISH
|
1. Ineffective feed circuit.
|
1. Test and repair shorted back-up lamp feed circuit if required.
|
2. Ineffective switch.
|
2. Test and replace backup lamp switch (manual transmission) or transmission range sensor (automatic transmission) if required.
|
|
BRAKE LAMPS
CONDITION
|
POSSIBLE CAUSES
|
CORRECTION
|
BRAKE LAMP DOES NOT ILLUMINATE
|
1. Ineffective or missing fuse.
|
1. Test and replace brake lamp fuse if required.
|
2. Ineffective or missing bulb.
|
2. Test and replace brake lamp bulb if required.
|
|
3. Ineffective ground circuit.
|
3. Test and repair open brake lamp ground circuit if required.
|
|
4. Ineffective feed circuit.
|
4. Test and repair open brake lamp switch output circuit if required.
|
|
5. Ineffective switch.
|
5. Test and replace brake lamp switch if required.
|
|
BRAKE LAMP DOES NOT EXTINGUISH
|
1. Ineffective feed circuit.
|
1. Test and repair shorted brake lamp switch output circuit if required.
|
2. Ineffective switch.
|
2. Test and replace brake lamp switch if required.
|
|
DAYTIME RUNNING LAMPS
NOTE:
Before performing the following tests, determine whether the headlamp low and high beams operate. If the headlamp high and low beams are also ineffective, diagnose and repair
that problem before attempting to repair the Daytime Running Lamps.
CONDITION
|
POSSIBLE CAUSES
|
CORRECTION
|
DAYTIME RUNNING LAMPS WILL NOT ILLUMINATE
|
1. High beam relay installed.
|
1. Vehicles with DRL should have a solid state DRL relay, but no high beam relay. If vehicle has DRL relay installed, remove the high beam relay as required.
|
2. Ineffective or missing DRL relay.
|
2. Replace DRL relay with a known good unit and check operation. Replace DRL relay if required.
|
|
3. Incorrect BCM programming.
|
3. Use a diagnostic scan tool to check and correct BCM programming if required. Refer to the appropriate diagnostic information.
|
|
4. Ineffective BCM inputs or outputs.
|
4. Use a diagnostic scan tool to test the BCM inputs or outputs. Refer to the appropriate diagnostic information.
|
|
FRONT FOG LAMPS
CONDITION
|
POSSIBLE CAUSES
|
CORRECTION
|
ONE FRONT FOG LAMP DOES NOT ILLUMINATE
|
1. Ineffective or missing bulb.
|
1. Test and replace front fog lamp bulb if required.
|
2. Ineffective ground circuit.
|
2. Test and repair open front fog lamp ground circuit if required.
|
|
3. Ineffective feed circuit.
|
3. Test and repair open front fog lamp relay output circuit if required.
|
|
BOTH FRONT FOG LAMPS DO NOT ILLUMINATE
|
1. Ineffective or missing fuse.
|
1. Test and replace front fog lamp fuse if required.
|
2. Ineffective control circuit.
|
2. Test and repair open front fog lamp relay control circuit if required.
|
|
3. Ineffective or missing relay.
|
3. Test and replace front fog lamp relay if required.
|
|
4. Ineffective ground circuit.
|
4. Test and repair open front fog lamp ground circuit if required.
|
|
5. Ineffective feed circuit.
|
5. Test and repair open front fog lamp relay output circuit if required.
|
|
6. Ineffective switch.
|
6. Test and replace multi-function switch if required.
|
|
7. Ineffective BCM inputs or outputs.
|
7. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information.
|
|
FRONT FOG LAMPS DO NOT EXTINGUISH
|
1. Ineffective feed circuit.
|
1. Test and repair shorted front fog lamp relay output circuit if required.
|
2. Ineffective control circuit.
|
2. Test and repair shorted front fog lamp relay control circuit if required.
|
|
3. Ineffective relay.
|
3. Test and replace front fog lamp relay if required.
|
|
4. Ineffective switch.
|
4. Test and replace multi-function switch if required.
|
|
5. Ineffective BCM inputs or outputs.
|
5. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information.
|
|
HAZARD WARNING LAMPS
NOTE:
Before performing the following tests, confirm whether the left and right turn signals operate satisfactorily. If the turn signals are ineffective or operate improperly, diagnose
and repair that problem before attempting to repair the Hazard Warning Lamps.
CONDITION
|
POSSIBLE CAUSES
|
CORRECTION
|
HAZARD WARNING LAMPS DO NOT FLASH
|
1. Ineffective or missing fuse.
|
1. Test and replace hazard warning fuse if required.
|
2. Ineffective ground circuit.
|
2. Test and repair open hazard switch ground circuit if required.
|
|
3. Ineffective feed circuit.
|
3. Test and repair open hazard switch fused B(+) circuit if required.
|
|
4. Ineffective switch/flasher.
|
4. Test and replace hazard switch/combination flasher unit if required.
|
|
HAZARD WARNING LAMPS DO NOT STOP FLASHING
|
1. Ineffective switch/flasher.
|
1. Test and replace hazard switch/combination flasher unit if required.
|
HEADLAMPS
CONDITION
|
POSSIBLE CAUSES
|
CORRECTION
|
ONE HEADLAMP DOES NOT ILLUMINATE
|
1. Ineffective or missing fuse.
|
1. Test and replace headlamp fuse if required.
|
2. Ineffective or missing bulb.
|
2. Test and replace headlamp bulb if required.
|
|
3. Ineffective ground circuit.
|
3. Test and repair open headlamp ground circuit if required.
|
|
4. Ineffective feed circuit.
|
4. Test and repair open headlamp low beam, high beam, or DRL relay output circuit if required.
|
|
BOTH LOW OR HIGH BEAM HEADLAMPS DO NOT ILLUMINATE
|
1. Ineffective or missing relay.
|
1. Test and replace low beam, high beam, or DRL relay if required. (Note: Vehicles with a DRL relay do not use a high beam relay. The DRL relay cannot be tested. Replace
DRL relay with a known good unit and check operation. Replace DRL relay if required.)
|
2. Ineffective control circuit.
|
2. Test and repair open low beam or high beam relay control circuit if required.
|
|
3. Ineffective switch.
|
3. Test and replace multi-function switch if required.
|
|
4. Ineffective BCM inputs or outputs.
|
4. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information.
|
|
HEADLAMPS DO NOT EXTINGUISH
|
1. Ineffective feed circuit.
|
1. Test and repair shorted headlamp low beam, high beam, or DRL relay output circuit if required.
|
2. Ineffective control circuit.
|
2. Test and repair shorted low beam or high beam relay control circuit if required.
|
|
3. Ineffective relay.
|
3. Test and replace low beam, high beam, or DRL relay if required. (Note: Vehicles with a DRL relay do not use a high beam relay. The DRL relay cannot be tested. Replace
DRL relay with a known good unit and check operation. Replace DRL relay if required.)
|
|
4. Ineffective switch.
|
4. Test and replace multi-function switch if required.
|
|
5. Ineffective BCM inputs or outputs.
|
5. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information.
|
|
HEADLAMPS WILL NOT SWITCH FROM HIGH TO LOW BEAMS, OR FROM LOW TO HIGH BEAMS
|
1. Ineffective relay.
|
1. Test and replace low beam, high beam, or DRL relay if required. (Note: Vehicles with a DRL relay do not use a high beam relay. The DRL relay cannot be tested. Replace
DRL relay with a known good unit and check operation. Replace DRL relay if required.)
|
2. Ineffective switch.
|
2. Test and replace multi-function switch if required.
|
|
3. Ineffective BCM inputs or outputs.
|
3. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information.
|
|
HEADLAMP LEVELING
NOTE:
Before performing the following tests, confirm whether the park lamps operate properly. If the park lamps are ineffective, diagnose and repair that problem before attempting
to repair the Headlamp Leveling System.
CONDITION
|
POSSIBLE CAUSES
|
CORRECTION
|
ONE LEVELING MOTOR IS INEFFECTIVE
|
1. Ineffective ground circuit.
|
1. Test and repair open leveling motor ground circuit if required.
|
2. Ineffective feed circuit.
|
2. Test and repair open leveling motor feed circuit if required.
|
|
3. Ineffective signal circuit.
|
3. Test and repair open headlamp adjust signal circuit if required.
|
|
4. Ineffective motor.
|
4. Test and replace headlamp leveling motor if required.
|
|
BOTH LEVELING MOTORS ARE INEFFECTIVE
|
1. Ineffective switch ground circuit.
|
1. Test and repair open leveling switch ground circuit if required.
|
2. Ineffective motor ground circuit.
|
2. Test and repair open leveling motor ground circuit if required.
|
|
3. Ineffective switch feed circuit.
|
3. Test and repair open leveling switch feed circuit if required.
|
|
4. Ineffective motor feed circuit.
|
4. Test and repair open leveling motor feed circuit if required.
|
|
5. Ineffective signal circuit.
|
5. Test and repair open or shorted leveling motor signal circuit if required.
|
|
6. Ineffective switch.
|
6. Test and replace leveling switch if required.
|
|
7. Ineffective motors.
|
7. Test and replace leveling motors if required.
|
|
LIGHT BAR LAMPS
NOTE:
Before performing the following tests on vehicles manufactured for markets outside of North America, confirm whether both the park lamps and the low beam headlamps operate
satisfactorily. If the park lamps or low beam headlamps are ineffective or operate improperly, diagnose and repair that problem before attempting to repair the light bar lamps.
CONDITION
|
POSSIBLE CAUSES
|
CORRECTION
|
ONE LIGHT BAR LAMP DOES NOT ILLUMINATE
|
1. Ineffective or missing bulb.
|
1. Test and replace off road lamp bulb if required.
|
2. Ineffective ground circuit
|
2. Test and repair open off road lamp ground circuit if required.
|
|
3. Ineffective feed circuit.
|
Test and repair open lightbar switch output circuit if required.
|
|
NO LIGHT BAR LAMPS ILLUMINATE
|
1. Ineffective or missing fuse.
|
1. Test and replace light bar lamp fuse if required.
|
2. Ineffective switch feed circuit.
|
2. Test and repair open fused B(+) circuit to light bar switch if required.
|
|
3. Ineffective ground circuit.
|
3. Test and repair open off road lamp ground circuit if required.
|
|
4. Ineffective lamp feed circuit.
|
4. Test and repair open lightbar switch output circuit if required.
|
|
5. Ineffective switch ground circuit.
|
5. Test and repair open light bar switch ground circuit if required.
|
|
6. Ineffective switch feed circuit.
|
6. Test and repair open fused ignition switch output (run-start) circuit (North America) or park lamp relay output circuit (except North America) if required.
|
|
7 Ineffective switch.
|
7. Test and replace light bar lamp switch if required.
|
|
LIGHT BAR LAMPS DO NOT EXTINGUISH
|
1. Ineffective feed circuit.
|
1. Test and repair shorted lightbar switch output circuit if required.
|
2. Ineffective switch.
|
2. Test and replace light bar lamp switch if required.
|
|
INEFFECTIVE OR INCORRECT LIGHT BAR INDICATIONS IN INSTRUMENT CLUSTER
|
1. Ineffective switch sense circuit.
|
1. Test and repair open/shorted lightbar switch sense circuit if required.
|
2. Incorrect BCM programming.
|
2. Use a diagnostic scan tool to check and correct BCM programming. Refer to the appropriate diagnostic information.
|
|
3. Ineffective BCM inputs or outputs.
|
3. Use a diagnostic scan tool to test the BCM inputs or outputs. Refer to the appropriate diagnostic information.
|
|
PARK LAMPS
CONDITION
|
POSSIBLE CAUSES
|
CORRECTION
|
ONE OR SEVERAL, BUT NOT ALL LAMPS IN PARK LAMP CIRCUIT DO NOT ILLUMINATE
|
1. Ineffective or missing fuse.
|
1. Test and replace park lamp fuse if required.
|
2. Ineffective or missing bulb.
|
2. Test and replace park lamp bulb if required.
|
|
3. Ineffective ground circuit.
|
3. Test and repair open park lamp ground circuit if required.
|
|
4. Ineffective feed circuit.
|
4. Test and repair open park lamp relay output circuit if required.
|
|
NO PARK LAMPS ILLUMINATE
|
1. Ineffective or missing relay.
|
1. Test and replace park lamp relay if required.
|
2. Ineffective control circuit.
|
2. Test and repair open park lamp relay control circuit if required.
|
|
3. Ineffective switch.
|
3. Test and replace multi-function switch if required.
|
|
4. Ineffective BCM inputs or outputs.
|
4. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information.
|
|
PARK LAMPS DO NOT EXTINGUISH
|
1. Ineffective feed circuit.
|
1. Test and repair shorted park lamp relay output circuit if required.
|
2. Ineffective control circuit.
|
2. Test and repair shorted park lamp relay control circuit if required.
|
|
3. Ineffective relay.
|
3. Test and replace park lamp relay if required.
|
|
4. Ineffective switch.
|
4. Test and replace multi-function switch if required.
|
|
5. Ineffective BCM inputs or outputs.
|
5. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information.
|
|
REAR FOG LAMPS
CONDITION
|
POSSIBLE CAUSES
|
CORRECTION
|
ONE REAR FOG LAMP DOES NOT ILLUMINATE
|
1. Ineffective or missing bulb.
|
1. Test and replace rear fog lamp bulb if required.
|
2. Ineffective ground circuit.
|
2. Test and repair open rear fog lamp ground circuit if required.
|
|
3. Ineffective feed circuit.
|
3. Test and repair open rear fog lamp relay output circuit if required.
|
|
BOTH REAR FOG LAMPS DO NOT ILLUMINATE
|
1. Ineffective or missing fuse.
|
1. Test and replace rear fog lamp fuse if required.
|
2. Ineffective ground circuit.
|
2. Test and repair open rear fog lamp ground circuit if required.
|
|
3. Ineffective supply circuit.
|
3. Test and repair open rear fog lamp relay output circuit if required.
|
|
4. Ineffective control circuit.
|
4. Test and repair open rear fog lamp relay control circuit if required.
|
|
5. Ineffective or missing relay.
|
5. Test and replace rear fog lamp relay if required.
|
|
6. Ineffective switch.
|
6. Test and replace multi-function switch if required.
|
|
7. Incorrect BCM programming.
|
7. Use a diagnostic scan tool to check and correct BCM programming. Refer to the appropriate diagnostic information.
|
|
8. Ineffective BCM inputs or outputs.
|
8. Use a diagnostic scan tool to test the BCM inputs or outputs. Refer to the appropriate diagnostic information.
|
|
REAR FOG LAMPS DO NOT EXTINGUISH
|
1. Ineffective feed circuit.
|
1. Test and repair shorted rear fog lamp relay output circuit if required.
|
2. Ineffective control circuit.
|
2. Test and repair shorted rear fog lamp relay control circuit if required.
|
|
3. Ineffective relay.
|
3. Test and replace rear fog lamp relay if required.
|
|
4. Ineffective switch.
|
4. Test and replace multi-function switch if required.
|
|
5. Ineffective BCM inputs or outputs.
|
5. Use a diagnostic scan tool to test the BCM inputs or outputs. Refer to the appropriate diagnostic information.
|
|
TURN SIGNAL LAMPS
CONDITION
|
POSSIBLE CAUSES
|
CORRECTION
|
ONE TURN SIGNAL LAMP DOES NOT ILLUMINATE
|
1. Ineffective or missing bulb.
|
1. Test and replace turn signal bulb if required.
|
2. Ineffective ground circuit.
|
2. Test and repair open ground circuit if required.
|
|
3. Ineffective feed circuit.
|
3. Test and repair open right or left turn signal circuit if required.
|
|
ALL RIGHT SIDE OR ALL LEFT SIDE TURN SIGNAL LAMPS DO NOT FLASH
|
1. Ineffective sense circuit.
|
1. Test and repair open right or left turn switch sense circuit if required.
|
2. Ineffective signal circuit.
|
2. Test and repair open right or left turn signal circuit if required.
|
|
3. Ineffective switch.
|
3. Test and replace multi-function switch if required.
|
|
4. Ineffective flasher.
|
4. Replace hazard switch/combination flasher with a known good unit and check operation. Replace hazard switch/combination flasher unit if required.
|
|
ALL RIGHT SIDE OR ALL LEFT SIDE TURN SIGNALS FLASH TOO RAPIDLY (MORE THAN 100 FLASHES PER MINUTE)
|
1. Ineffective or missing bulb.
|
1. Test and replace turn signal bulb if required.
|
2. Ineffective ground circuit.
|
2. Test and repair open ground circuit if required.
|
|
3. Ineffective signal circuit
|
3. Test and repair open right or left turn signal circuit if required.
|
|
4. Ineffective flasher.
|
4. Replace hazard switch/combination flasher with a known good unit and check operation. Replace hazard switch/combination flasher unit if required.
|
|