DTC Diagnosis Procedure

The IPDM E/R (intelligent power distribution module engine room) controls the tail lamp relay based on inputs from the BCM via the CAN communication lines. When the tail lamp relay is energized, power flows through fuses 36 and 37, located in the IPDM E/R. Power then flows to the front and rear combination lamps, license plate lamps.

1. CHECK PARKING LAMP FUSES 
   1. Ignition switch OFF.
   2. Check that the following fuse is not open.

   Unit	Location	Fuse No.	Capacity
   Parking lamps	IPDM E/R	36	10A
   		37	10A

   Is the fuse open?

   YES

   Replace the fuse after repairing the affected circuit.

   NO

   GO TO 2.

2. CHECK PARKING 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 3.

   NO

   Replace the bulb.

3. CHECK TAIL LAMP RELAY OUTPUT (VOLTAGE) 
   1. Ignition switch OFF.
   2. Disconnect the front combination lamp connector, rear combination lamp connector and license plate lamp connector.
   3. Ignition switch ON.
   4. Turn the parking lamps ON.
   5. With the parking lamps ON, check voltage between the front combination lamp connectors and ground.

      (+)			(-)	Voltage (Approx.)
      Front combination lamp
      Connector		Terminal
      LH	E11	6	Ground	Battery voltage
      RH	E107

   6. With the parking lamps ON, check voltage between the rear combination lamp connectors and ground.
      Cargo Van
      
      

      (+)			(-)	Voltage (Approx.)
      Rear combination lamp
      Connector		Terminal
      LH	R16	1	Ground	Battery voltage
      RH	R17

      Passenger Van
      
      

      (+)			(-)	Voltage (Approx.)
      Rear combination lamp
      Connector		Terminal
      LH	B51	1	Ground	Battery voltage
      RH	B52

   7. With the parking lamps ON, check voltage between the license plate lamp connector and ground.

      (+)			(-)	Voltage (Approx.)
      License plate lamp
      Connector		Terminal
      LH	D408	1	Ground	Battery voltage
      RH	D409

   Are voltage readings as specified?

   YES

   GO TO 5.

   NO

   GO TO 4.

4. CHECK PARKING, LICENSE PLATE AND TAIL LAMP CIRCUIT (OPEN) 
   1. Ignition switch OFF.
   2. Disconnect IPDM E/R connector.
   3. Check continuity between the IPDM E/R harness connector and the front combination lamp harness connector.

      IPDM E/R			Front combination lamp		Continuity
      Connector		Terminal	Connector	Terminal
      LH	E121	29	E11	6	Yes
      RH		28	E107

   4. Check continuity between the IPDM E/R harness connector and the rear combination lamp harness connector.
      Cargo Van
      
      

      IPDM E/R			Rear combination lamp		Continuity
      Connector		Terminal	Connector	Terminal
      LH	E124	57	R16	1	Yes
      RH			R17

      Passenger Van
      
      

      IPDM E/R			Rear combination lamp		Continuity
      Connector		Terminal	Connector	Terminal
      LH	E124	57	B51	1	Yes
      RH			B52

   5. Check continuity between the IPDM E/R harness connector and license plate lamp connector.

      IPDM E/R			License plate lamp		Continuity
      Connector		Terminal	Connector	Terminal
      LH	E124	57	D408	1	Yes
      RH			D409

   Are continuity test results as specified?

   YES

   Replace IPDM E/R. Refer to Removal and Installation .

   NO

   Repair the harness or connector.

5. CHECK PARKING, LICENSE AND TAIL LAMP GROUND CIRCUITS 
   1. Check continuity between the front combination lamp harness connectors and ground.

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

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

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

      Passenger Van
      
      

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

   3. Check continuity between the license plate lamp harness connectors and ground.

      License plate lamp			--	Continuity
      Connector		Terminal
      LH	D408	2	Ground	Yes
      RH	D409

   Does continuity exist?

   YES

   Replace malfunctioning lamp.

   NO

   Repair the harness.