Nissan Maxima Service and Repair Manual: DTC/circuit diagnosis

  • Power supply and ground circuit
  • BCM (BODY CONTROL MODULE) BCM (BODY CONTROL MODULE) : Diagnosis Procedure 1. CHECK FUSE AND FUSIBLE LINK Check if the following BCM fuses or fusible link are blown. 2. CHECK POWER SUPPLY CIRCUIT Turn ignition switch OFF. Disconnect BCM. Check voltage between BCM harness connector and ground. 3. CHECK GROUND CIRCUIT Check continuity between BCM harness connector and ground BCM (BODY CONTROL MODULE) : Special Repair Requirement 1. REQUIRED WORK WHEN REPLACING BCM IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) : Diagnosis Procedure 1.

  • Headlamp (HI) circuit
  • Description The IPDM E/R (intelligent power distribution module engine room) controls the headlamp high relay based on inputs from the BCM over the CAN communication lines. When the headlamp high relay is energized, power flows through fuses 48 and 49, located in the IPDM E/R. Power then flows to the front combination lamps to the headlamp high beam. Component Function Check 1.CHECK HEADLAMP (HI) OPERATION WITHOUT CONSULT Start IPDM E/R auto active test. Refer to PCS-11, "Diagnosis Description". Check that the headlamp switches to the high beam. NOTE: HI/LO is repeated 1 second each when using the IPDM E/R auto active test. CONSULT Select "EXTERNAL LAMPS" of IPDM E/R active test item.

  • Headlamp (LO) circuit
  • Description The IPDM E/R (intelligent power distribution module engine room) controls the headlamp low relay based on inputs from the BCM over the CAN communication lines. When the headlamp low relay is energized, power flows through fuses 51 and 52, located in the IPDM E/R. Power then flows to the front combination lamps to the headlamp low beam. Component Function Check 1.CHECK HEADLAMP (LO) OPERATION WITHOUT CONSULT Start IPDM E/R auto active test. Refer to PCS-11, "Diagnosis Description". Check that the headlamp is turned ON. NOTE: HI/LO is repeated 1 second each when using the IPDM E/R auto active test. CONSULT Select "EXTERNAL LAMPS" of IPDM E/R active test item.

  • Front fog lamp circuit
  • Description The IPDM E/R (intelligent power distribution module engine room) controls the front fog lamp relay based on inputs from the BCM over the CAN communication lines. When the front fog lamp relay is energized, power flows from the front fog lamp relay in the IPDM E/R to the front fog lamps. Component Function Check 1.CHECK FRONT FOG LAMP OPERATION WITHOUT CONSULT Activate IPDM E/R auto active test. Refer to PCS-11, "Diagnosis Description". Check that the front fog lamp is turned ON. CONSULT Select "EXTERNAL LAMPS" of IPDM E/R active test item. While operating the test item, check that the front fog lamp is turned ON.

  • Parking lamp circuit
  • Description The IPDM E/R (intelligent power distribution module engine room) controls the tail lamp relay based on inputs from the BCM over the CAN communication lines. When the tail lamp relay is energized, power flows through fuses 46 and 47, located in the IPDM E/R. Power then flows to the front and rear combination lamps, license plate lamps. Component Function Check 1.CHECK PARKING LAMP OPERATION WITHOUT CONSULT Activate IPDM E/R auto active test. Refer to PCS-11, "Diagnosis Description". Check that the parking lamp is turned ON. CONSULT Select "EXTERNAL LAMPS" of IPDM E/R active test item. While operating the test item, check that the parking lamp is turned ON.

  • Turn signal lamp circuit
  • Description The BCM monitors inputs from the combination 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 Select "FLASHER" of BCM (FLASHER) active test item.

  • Optical sensor
  • Description The optical sensor converts the outside brightness (lux) to voltage and transmits the optical sensor signal to the BCM. Component Function Check 1.CHECK OPTICAL SENSOR SIGNAL BY CONSULT CONSULT Turn the ignition switch ON. Select "OPTICAL SENSOR" of BCM (HEAD LAMP) DATA MONITOR item. Turn the lighting switch to AUTO. While the auto light system is operating, check the monitor status. *: Illuminates the optical sensor. The value may be less than the standard value if brightness is weak. Diagnosis Procedure 1.CHECK OPTICAL SENSOR POWER SUPPLY INPUT Turn the ignition switch ON. Turn the lighting switch to AUTO.

  • Hazard switch
  • Component Function Check 1.CHECK HAZARD SWITCH SIGNAL BY CONSULT CONSULT DATA MONITOR Turn ignition switch ON. Select "HAZARD SW" of BCM (FLASHER) DATA MONITOR item. With operating the hazard switch, check the monitor status. Diagnosis Procedure 1.CHECK HAZARD SWITCH SIGNAL INPUT Turn ignition switch OFF. Disconnect hazard switch connector. Turn ignition switch ON. Check voltage between hazard switch harness connector and ground. 2.CHECK HAZARD SWITCH SIGNAL OPEN CIRCUIT Turn ignition switch OFF. Disconnect BCM connector M19. Check continuity between hazard harness connector and BCM harness connector 3.

Diagnosis system (ipdm E/R)

Power supply and ground circuit