Turn Signals: Testing and Inspection

TURN SIGNAL LAMP CIRCUIT

Description

The BCM monitors inputs from the combination switch (lighting and turn signal switch) to determine when to activate the turn signals. The BCM outputs voltage direction to the left and right turn signals during turn signal operation or both during hazard warning operation. The BCM sends a turn signal indicator request to the combination meter via the CAN communication lines.
The BCM performs the fast 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
1.Select FLASHER of BCM (FLASHER) active test item.
2.While operating the test items, check that the turn signal lamp blinks.
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

Regarding Wiring Diagram information, refer to "Wiring Diagram" Electrical Diagrams.

1. CHECK TURN SIGNAL LAMP BULB

Check the applicable lamp bulb to be sure the proper bulb standard is in use and the bulb is not open.
Is the bulb OK?
YES- GO TO 2.
NO- Replace the bulb.

2. CHECK TURN SIGNAL LAMP OUTPUT VOLTAGE

1.Turn the ignition switch OFF.
2.Disconnect the front combination lamp harness connector or the rear combination lamp harness connector in question.
3.Turn the ignition switch ON.
4.Operate the turn signal switch.
5.While the turn signal is operating, check the voltage between the front combination lamp harness connector and ground.





Revision: March 20122013 Infiniti JX

6.While the turn signal is operating, check the voltage between the rear combination lamp harness connector and ground.





Is voltage reading as specified?
YES- GO TO 5.
NO- GO TO 3.

3. CHECK TURN SIGNAL LAMP CIRCUIT FOR OPEN

1.Turn the ignition switch OFF.
2.Disconnect BCM harness connector M20 or M80.
3.Check continuity between the BCM harness connector M80 and the front combination lamp harness connector.





4.Check continuity between the BCM harness connector M20 and the rear combination lamp harness connector.





Is the inspection results normal?
YES- GO TO 4.
NO- Repair or replace the harness or connectors.

4. CHECK TURN SIGNAL LAMP SHORT CIRCUIT

1.Check continuity between the BCM harness connector M80 and ground.
Revision: March 20122013 Infiniti JX





2.Check continuity between the BCM harness connector M20 and the rear combination lamp connector.





Are the inspection results normal?
YES- Replace BCM. Refer to "Removal and Installation" Service and Repair.
NO- Repair or replace the harness or connectors.

5. CHECK TURN SIGNAL LAMP GROUND CIRCUIT

1.Check continuity between the front combination lamp harness connector or the rear combination lamp harness connector in question and ground.





2.Check continuity between the rear combination lamp harness connector and ground.





Are continuity results as specified?
YES- Replace the malfunctioning lamp.
NO- Repair or replace the harness or connectors.
Revision: March 20122013 Infiniti JX