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Nissan Sentra Service Manual: Rear window defogger power supply and ground circuit

Nissan Sentra Service Manual / Driver controls / Defogger / Dtc/circuit diagnosis / Rear window defogger power supply and ground circuit

Description

Heats the heating wire with the power supply from the rear window defogger relay to prevent the rear window from fogging up.

Component function check

1. Check rear window defogger

Check that the heating wire of rear window defogger is heated when turning the rear window defogger switch on.

Is the inspection result normal? Yes >> rear window defogger is ok.

No >> refer to def-33, "diagnosis procedure".

Diagnosis procedure

Regarding wiring diagram information, refer to def-20, "wiring diagram".

1. Check fuses

Check if any of the following fuses in IPDM E/R are blown.

Is the inspection result normal?


Is the inspection result normal? Yes >> go to 2.

No >> replace the blown fuse after repairing the affected circuit.

2. Check rear window defogger power supply circuit

  1. Turn ignition switch ON.
  2. Check voltage between ipdm e/r connector and ground.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 3.

NO >> Perform rear window defogger relay diagnosis. Refer to DEF-32, "Diagnosis Procedure".

3. Check power supply circuit

  1. Turn ignition switch on.
  2. Check voltage between rear window defogger connector and ground.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 4.

NO >> GO TO 5.

4. Check ground circuit

  1. Turn ignition switch off
  2. Disconnect rear window defogger.
  3. Check continuity between rear window defogger connector and ground.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 6.

NO >> Repair or replace harness.

5. Check harness continuity

  1. Turn ignition switch OFF.
  2. Disconnect IPDM E/R.
  3. Check continuity between ipdm e/r connector and condenser connector.

Is the inspection result normal?


Is the inspection result normal? Yes >> replace condenser. Refer to def-49, "removal and installation".

No >> replace or repair harness.

6. Check filament

Check filament.

Refer to DEF-34, "Component Inspection".

Is the inspection result normal? YES >> Refer to GI-39, "Intermittent Incident".

NO >> Repair filament. Refer to DEF-47, "Inspection and Repair".

Component inspection

1. Check filament

Check the filament for damage or open circuits.

Refer to DEF-47, "Inspection and Repair".

Is the inspection result normal? YES >> Inspection End.

NO >> Repair filament. Refer to DEF-47, "Inspection and Repair".

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 Turn ignition switch ON. Check ...

Driver side door mirror defogger
Description Heats the heating wire with the power supply from the rear window defogger relay to prevent the door mirror from fogging up. Component Function Check Check that heating wire of doo ...

Other materials:

Hazard warning flasher switch
Push the switch on to warn other drivers when you must stop or park under emergency conditions. All turn signal lights flash. WARNING If stopping for an emergency, be sure to move the vehicle well off the road. Do not use the hazard warning flashers while moving on th ...

Fuses
Two types of fuses are used. Type A is used in the fuse boxes in the engine compartment. Type B is used in the passenger compartment fuse box. Type A fuses are provided as spare fuses. They are stored in the passenger compartment fuse box. Type A fuses can be installed in the engine com ...

Ambient sensor signal circuit
Description It detects outside air temperature and converts it into a resistance value which is then input into the combination meter. Diagnosis Procedure Regarding wiring diagram information, refer to mwi-28, "wiring diagram". 1.Check ambient sensor signal circuit Turn igniti ...

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