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 ACTIVE TEST
1.Select "FLASHER" of BCM (FLASHER) active test item.
2.With operating the test items, check that the turn signal lamp blinks.

LH: Turn signal lamp LH blinking
RH: Turn signal lamp RH blinking
Off: The turn signal lamp OFF

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


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 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.
Front/side





Rear





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.
Front turn signal lamp





Side turn signal lamp





Rear turn signal lamp





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.
Front/side





Rear





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.
Front turn signal lamp





Side turn signal lamp





Rear turn signal lamp





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