DTC Diagnosis Procedure

The BCM monitors inputs from the combination switch (high beam 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.

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. Ignition switch OFF.
   2. Disconnect the front combination lamp connector and the rear combination lamp connector.
   3. Ignition switch ON.
   4. With turn signal switch operating, check the voltage between the front combination lamp harness connector and ground.

      (+)			(-)	Voltage (Approx.)
      Front combination lamp
      Connector		Terminal
      LH	E11	3	Ground	Courtesy of NISSAN NORTH AMERICA, INC.
      RH	E107	3

   5. With turn signal switch operating, check the voltage between the rear combination lamp harness connector and ground.
      Cargo Van
      
      

      (+)			(-)	Voltage (Approx.)
      Rear combination lamp
      Connector		Terminal
      LH	R16	6	Ground	Courtesy of NISSAN NORTH AMERICA, INC.
      RH	R17	6

      Passenger Van
      
      

      (+)			(-)	Voltage (Approx.)
      Rear combination lamp
      Connector		Terminal
      LH	B51	6	Ground	Courtesy of NISSAN NORTH AMERICA, INC.
      RH	B52	6

   Is voltage reading as specified?

   YES

   GO TO 5

   NO

   GO TO 3

3. CHECK TURN SIGNAL LAMP CIRCUIT FOR OPEN 
   1. Ignition switch OFF.
   2. Disconnect BCM connector.
   3. Check continuity between the BCM harness connector and the front combination lamp connector.

      BCM			Front combination lamp		Continuity
      Connector		Terminal	Connector	Terminal
      Front LH	M20	60	E11	3	Yes
      Front RH		61	E107

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

      BCM			Front combination lamp		Continuity
      Connector		Terminal	Connector	Terminal
      Rear LH	M20	60	R16	6	Yes
      Rear RH		61	R17

      Passenger Van
      
      

      BCM			Rear combination lamp		Continuity
      Connector		Terminal	Connector	Terminal
      Rear LH	M20	60	B51	6	Yes
      Rear RH		61	B52

   Are continuity test results as specified?

   YES

   GO TO 4.

   NO

   Repair the harness or connector.

4. CHECK TURN SIGNAL LAMP SHORT CIRCUIT 

   Check continuity between the BCM harness connector and ground.

   BCM			--	Continuity
   Connector		Terminal
   LH	M20	60	Ground	No
   RH		61

   Does continuity exist?

   YES

   Repair the harness or connector.

   NO

   Replace BCM. Refer to Removal and Installation .

5. CHECK TURN SIGNAL LAMP GROUND CIRCUIT 
   1. Check continuity between the front combination lamp harness connector and ground.

      Front combination lamp			--	Continuity
      Connector		Terminal
      Front LH	E11	5	Ground	Yes
      Front RH	E107

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

      Rear combination lamp			--	Continuity
      Connector		Terminal
      Rear LH	R16	4	Ground	Yes
      Rear RH	R17

      Passenger Van
      
      

      Rear combination lamp			--	Continuity
      Connector		Terminal
      Rear LH	B51	4	Ground	Yes
      Rear RH	B52

   Are continuity test results as specified?

   YES

   Replace malfunctioning lamp.

   NO

   Repair the harness or connector.