Turn Signal and Hazard Warning Systems
INTRODUCTIONWhen diagnosing the turn signal or hazard warning circuits, remember that high generator output can burn out bulbs rapidly and repeatedly If this is a problem on the vehicle being diagnosed, refer to Starting and Charging/Charging System for further diagnosis of a possible generator overcharging condition.
Turn Signal System
WARNING: ON VEHICLES EQUIPPED WITH AN AIR BAG, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFORE ATTEMPTING STEERING WHEEL OR STEERING COLUMN COMPONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.
1. Turn the ignition switch to the On position. Move the turn signal lever down for a left turn signal problem, or up for a right turn signal problem. Observe the turn signal indicator lamp in the instrument cluster. If the indicator lamp lights but does not flash, check for an exterior turn signal lamp that is not lit or is very dimly lit. Repair the circuits to that lamp or replace the faulty bulb, as required. Test the turn signal operation again. If the turn signal indicator lamp does not light or still doesn't flash, go to Step 2.
2. Check the fuse in the fuseblock module. If OK, go to Step 3. If not OK, replace the faulty fuse.
3. With the ignition switch in the On position, check for battery voltage at the fuse in the fuseblock module. If OK, go to Step 4. If not OK, repair the open circuit as required.
4. Remove the turn signal flasher as described. With the ignition switch in the On position, place the turn signal lever in the neutral position. There should be battery voltage at the fused ignition switch output circuit cavity for the turn signal flasher. If OK, go to Step 5. If not OK, repair the open circuit as required.
5. Replace the turn signal flasher with a known good unit of the same rating. Move the turn signal lever down for a left turn signal problem, or up for a right turn signal problem. The lamps should flash. If OK, discard the faulty flasher. If not OK, go to Step 6.
6. Check for continuity between the turn signal flasher signal circuit cavities for the turn signal flasher and the multi-function switch wire harness connector. There should be continuity. If OK, see the diagnosis for the Multi-Function Switch. If not OK, repair the open circuit as required.
Hazard Warning System
WARNING: ON VEHICLES EQUIPPED WITH AN AIR BAG, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFORE ATTEMPTING STEERING WHEEL OR STEERING COLUMN COMPONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.
1. Check the fuse in the Power Distribution Center (PDC). If OK, go to Step 2. If not OK, replace the faulty fuse.
2. Remove the hazard warning flasher as described. Check for battery voltage at the fused B(+) circuit cavity for the hazard warning flasher. If OK, go to Step 3. If not OK, repair the open circuit as required.
3. Replace the hazard flasher with a known good unit of the same rating. With the hazard warning switch in the On position, the lamps should flash. If OK, discard the faulty flasher. If not OK, go to Step 4.
4. Check for continuity between the hazard flasher signal circuit cavities for the hazard flasher and the multi-function switch wire harness connector. There should be continuity. If OK, see the diagnosis for the Multi-Function Switch. If not OK, repair the open circuit as required.