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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".

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