Turn Signals: Testing and Inspection

TURN SIGNAL LAMP CIRCUIT





Description
BCM performs the high flasher operation (fail-safe) if any bulb or harness of the turn signal lamp circuit is open.

NOTE:
Turn signal lamp blinks at normal speed when using the hazard warning lamp.




Component Function Check
1.CHECK TURN SIGNAL LAMP
CONSULT-III ACTIVE TEST
1. Select "FLASHER" of BCM (FLASHER) active test item.
2. With operating the test items, check that the turn signal lamp blinks.






Does the turn signal lamp blink?
YES - Turn signal lamp circuit is normal.
NO - SEE Diagnosis Procedure.




Diagnosis Procedure
1.CHECK TURN SIGNAL LAMP BULB
Check the applicable lamp bulb.
Is the bulb normal?
YES - GO TO 2.
NO - Replace the bulb.
2.CHECK TURN SIGNAL LAMP OUTPUT VOLTAGE
CONSULT-III ACTIVE TEST
1. Turn the ignition switch OFF.
2. Disconnect the front combination lamp connector, side turn signal lamp connector or the rear combination lamp connector.
3. Turn the ignition switch ON.
4. Select "FLASHER" of BCM (FLASHER) active test item.
5. With operating the turn signal switch, check the voltage between the BCM harness connector and the ground.











Is the measurement value normal?
YES - GO TO 3.
NO - Replace BCM.
3.CHECK TURN SIGNAL LAMP OPEN CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect BCM connector.
3. Check the continuity between the BCM harness connector and the front combination lamp, side turn signal lamp or rear combination lamp harness connector.
















Does continuity exist?
YES - GO TO 4.
NO - Repair the harnesses or connectors.
4.CHECK TURN SIGNAL LAMP SHORT CIRCUIT
Check continuity between the BCM harness connector and the ground.











Does continuity exist?
YES - Repair the harnesses or connectors.
NO - GO TO 5.
5.CHECK TURN SIGNAL LAMP GROUND OPEN CIRCUIT
Check the continuity between the front combination lamp, side turn signal lamp or rear combination lamp and the ground.
















Does continuity exist?
YES - Replace the front combination lamp, side turn signal lamp or rear combination lamp.
NO - Repair the harnesses or connectors.