Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

Symptom: Rear Window Defogger Does Not Activate, or Does Not Go Off After Activating.

CHECK REAR WINDOW DEFOGGER OUTPUT SIGNAL
With CONSULT-II

Select "ACTIVE TEST" in "REAR DEFOGGER" with CONSULT-II.

Fig 1: Consult-II Display - Active Test
Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II
1. Turn ignition switch to ON position.
2. Check voltage between smart entrance control unit harness terminal 2 and ground.
Fig 2: Checking Voltage Between Smart Entrance Control Unit Harness Terminal 2 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: Check the following.
  - Refer to "REAR WINDOW DEFOGGER RELAY ".
  - Rear window defogger circuit
  - Refer to "FILAMENT CHECK ".
2. NG: GO TO 2.
CHECK DEFOGGER RELAY COIL SIDE CIRCUIT
1. Disconnect control unit connector.
2. Turn ignition switch to ON position.
3. Check voltage between smart entrance control unit terminal 2 and ground.
Fig 3: Checking Voltage Between Smart Entrance Control Unit Terminal 2 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 3.
2. NG: Check the following.
  - 10A fuse [No. 10, located in the fuse block (J/B)]
  - Rear window defogger relay
  - Harness for open or short between 10A fuse [No. 10, located in the fuse block (J/B)] and rear window defogger relay
  - Harness for open or short between rear window defogger relay and smart entrance control unit
CHECK REAR WINDOW DEFOGGER SWITCH INPUT SIGNAL
With CONSULT-II

Select "REAR DEF SW" in "DATA MONITOR" mode with CONSULT-II.

Fig 4: Consult-II Display - Data Monitor
Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II

Check continuity between smart entrance control unit terminal 39 and ground.

Fig 5: Checking Continuity Between Smart Entrance Control Unit Terminal 39 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 4.
2. NG: Check the following.
  - Refer to "REAR WINDOW DEFOGGER SWITCH ".
  - Harness for open or short between smart entrance control unit and rear window defogger switch
  - Rear window defogger switch ground circuit
CHECK POWER SUPPLY AND IGNITION INPUT SIGNAL
Check voltage between smart entrance control unit terminals 10 and 33 and ground.

Fig 6: Checking Voltage Between Smart Entrance Control Unit Terminals 10 And 33 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 5.
2. NG: Check the following.
  - 10A fuse [No. 10 or No. 37, located in the fuse block (J/B)]
  - Harness for open or short between smart entrance control unit and fuse
CHECK SMART ENTRANCE CONTROL UNIT GROUND CIRCUIT
Check continuity between smart entrance control unit terminal 16 and ground.

Fig 7: Checking Continuity Between Smart Entrance Control Unit Terminal 16 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
1. Yes: Replace smart entrance control unit.
2. No: Repair harness or connectors.