Turn Signals: Testing and Inspection
TURN SIGNAL LAMP CIRCUIT
Component Function Check
1. CHECK TURN SIGNAL LAMP
CONSULT ACTIVE TEST
1.Select "FLASHER" of BCM (FLASHER) active test item.
2.With operating the test items, check that the turn signal lamp is turned ON.
LH: Turn signal lamps (LH) ON
RH: Turn signal lamps (RH) ON
Off: Turn signal lamps OFF
Is the inspection result normal?
YES- Turn signal lamp circuit is normal.
NO- Refer to "Diagnosis Procedure" .
Diagnosis Procedure
1. CHECK TURN SIGNAL LAMP BULB
Check applicable lamp bulb.
Is the inspection result normal?
YES- GO TO 2.
NO- Replace bulb.
2. CHECK TURN SIGNAL LAMP OUTPUT VOLTAGE
1.Turn ignition switch OFF.
2.Disconnect front combination lamp connector, door mirror connector and rear combination lamp connector.
3.Turn ignition switch ON.
4.With operating the turn signal switch, check voltage between BCM harness connector and ground.
Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 4.
3. CHECK TURN SIGNAL LAMP OPEN CIRCUIT
1.Turn ignition switch OFF.
2.Disconnect BCM connector.
3.Check continuity between BCM harness connector and front combination lamp, door mirror or rear combination lamp harness connector.
Front turn signal lamp
Side turn signal lamp
Rear turn signal lamp
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace harness.
4. CHECK TURN SIGNAL LAMP SHORT CIRCUIT
Check continuity between BCM harness connector and ground.
Is the inspection result normal?
YES- Check each bulb socket for internal short circuit. Replace BCM if check result is normal. Refer to
"Removal and Installation" Service and Repair.
NO- Repair or replace harness.
5. CHECK TURN SIGNAL LAMP GROUND OPEN CIRCUIT
Check continuity between front combination lamp, door mirror or rear combination lamp and ground.
Front turn signal lamp
Side turn signal lamp
Rear turn signal lamp
Is the inspection result normal?
YES- Check corresponding bulb socket and harness. Repair or replace if necessary.
NO- Repair or replace harness.