Nissan Maxima Service and Repair Manual: DTC/circuit diagnosis

  • Power supply and ground circuit
  • BCM BCM : 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 : Special Repair Requirement 1. REQUIRED WORK WHEN REPLACING BCM Initialize control unit.

  • Battery saver output/power supply circuit
  • Description Provides the interior room lamp power supply. Also cuts the power supply when the interior room lamp battery saver is activated. Component Function Check 1.CHECK BATTERY SAVER OUTPUT/POWER SUPPLY FUNCTION CONSULT Turn ignition switch ON. Turn each interior room lamp ON. Front room/map lamp assembly Personal lamps rear Foot lamps Front step lamps Rear step lamps Trunk room lamp Vanity mirror lamps Select "BATTERY SAVER" of BCM (BATTERY SAVER) active test item. While operating the test item, check that each interior room lamp turns ON/OFF. OFF : Interior room lamp OFF ON : Interior room lamp ON Diagnosis Procedure 1.

  • Interior room lamp control circuit
  • Description Controls each interior room lamp (ground side) by PWM signal. NOTE: PWM signal control period is approximately 250 Hz (in the gradual brightening/dimming). Component Function Check CAUTION: Before performing the diagnosis, check that the following is normal. Battery saver output/power supply Front room/map lamp assembly bulbs Personal lamp rear bulbs Foot lamp bulbs 1.CHECK INTERIOR ROOM LAMP CONTROL FUNCTION CONSULT Switch the front room/map lamp assembly to DOOR. Turn ignition switch ON. Select "INT LAMP" of BCM (INT LAMP) active test item. While operating the test item, check that each interior room lamp turns ON/OFF (gradual brightening/dimming).

  • Step lamp circuit
  • Description Controls the step lamp (ground side) to turn the step lamp ON and OFF. Component Function Check CAUTION: Before performing the diagnosis, check that the following is normal. Battery saver output/power supply Step lamp bulbs 1.CHECK STEP LAMP OPERATION CONSULT Turn ignition switch ON. Select "STEP LAMP TEST" of BCM (INT LAMP) active test item. While operating the test item, check that step lamps turn ON/OFF. ON : Step lamp ON OFF : Step lamp OFF Diagnosis Procedure 1.CHECK STEP LAMP OUTPUT CONSULT Turn ignition switch ON. Select "STEP LAMP TEST" of BCM (INT LAMP) active test item. While operating the test item, check voltage between BCM connector M17 terminal 7 and ground. 2.

  • Trunk room lamp circuit
  • Description Controls the trunk room lamp (ground side) to turn the trunk room lamp ON and OFF. Component Function Check CAUTION: Before performing the diagnosis, check that the following is normal. Battery saver output/power supply Trunk room lamp bulb 1.CHECK TRUNK ROOM LAMP OPERATION CONSULT Turn ignition switch ON. Select "LUGGAGE LAMP TEST" of BCM (INT LAMP) active test item. While operating the test item, check that trunk room lamp turns ON/OFF. ON : Trunk room lamp ON OFF : Trunk room lamp OFF Diagnosis Procedure 1.CHECK TRUNK ROOM LAMP OUTPUT CONSULT Turn ignition switch ON. Select "LUGGAGE LAMP TEST" of BCM (INT LAMP) active test item.

  • Push-button ignition switch illumination circuit
  • Description Provides the power supply and the ground to control the push-button ignition switch illumination. Component Function Check 1.CHECK PUSH-BUTTON IGNITION SWITCH ILLUMINATION OPERATION CONSULT Turn the ignition switch ON. Select "ENGINE SW ILLUMI" of BCM (INTELLGENT KEY) active test item. While operating the test item, check that the push-button ignition switch illumination turns ON/OFF ON : Push-button ignition switch illumination ON OFF : Push-button ignition switch illumination OFF Diagnosis Procedure 1.CHECK PUSH-BUTTON IGNITION SWITCH ILLUMINATION OPERATION CONSULT Turn the ignition switch ON. Select "ENGINE SW ILLUMI" of BCM (INTELLGENT KEY) active test item.

Diagnosis system (BCM)

Power supply and ground circuit