Nissan Maxima Service and Repair Manual: Rear window defogger relay

Description

Power is supplied to the rear window defogger with BCM control.

Component Function Check

1. CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT

Check that an operation noise of rear window defogger relay [located in fuse block (J/B)] can be heard when turning the rear window defogger switch ON.

Diagnosis Procedure

1. CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT

Nissan Maxima. CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT

  1. Turn ignition switch ON.
  2. Check voltage between BCM harness connector M18 terminal 59 and ground.

Nissan Maxima. CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT

2. CHECK HARNESS CONTINUITY

Nissan Maxima. CHECK HARNESS CONTINUITY

  1. Turn ignition switch OFF.
  2. Disconnect BCM and fuse block (J/B).
  3. Check continuity between BCM harness connector M18 (A) terminal 59 and fuse block (J/B) harness connector M4 (B) terminal 4Q.
  4. Check continuity between BCM harness connector M18 (A) terminal 59 and ground.

Nissan Maxima. CHECK HARNESS CONTINUITY

Nissan Maxima. CHECK HARNESS CONTINUITY

3. CHECK REAR WINDOW DEFOGGER RELAY

Check rear window defogger relay.

4. CHECK INTERMITTENT INCIDENT

Check intermittent incident

Component Inspection

1. CHECK REAR WINDOW DEFOGGER RELAY

Nissan Maxima. CHECK REAR WINDOW DEFOGGER RELAY

Check rear window defogger relay.

Nissan Maxima. CHECK REAR WINDOW DEFOGGER RELAY

    Rear window defogger switch

    Rear window defogger power supply and ground circuit