Diagnostic Procedure

CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I
1. Turn ignition switch "ON".
2. Check voltage between ECM terminal 93 and ground under the following conditions.
  
  Fig 1: Checking Voltage Between ECM Terminal 93 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Condition And Voltage Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK GO TO 2.
2. NG GO TO 3 .
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II
Check voltage between ECM terminal 84 and ground under the following conditions.

Fig 3: Checking Voltage Between ECM Terminal 84 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 4: Condition And Voltage Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK INSPECTION END
2. NG GO TO 7 .
CHECK REAR WINDOW DEFOGGER FUNCTION
1. Start engine.
2. Turn "ON" the rear window defogger switch.
3. Check the rear windshield. Is the rear windshield heated up?
Yes or No
1. Yes GO TO 4.
2. No Refer to "REAR WINDOW DEFOGGER ".
CHECK REAR WINDOW DEFOGGER INPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect rear window defogger relay.
4. Check harness continuity between ECM terminal 93 and rear window defogger relay terminal 7.
  
  Fig 5: Checking Harness Continuity Between ECM Terminal 93 And Rear Window Defogger Relay Terminal 7
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 6: Condition And Continuity Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
5. Also check harness for short to ground and short to power.
OK or NG
1. OK GO TO 6 .
2. NG GO TO 5.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E1, M1
- Harness connectors M33, F22
- Diode M37
- Harness for open and short between ECM and rear window defogger relay
1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK INTERMITTENT INCIDENT
Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT " .
1. INSPECTION END
CHECK HEADLAMP FUNCTION
1. Start engine.
2. Turn the lighting switch "ON" at 1st position with high beam.
3. Check that headlamps are illuminated.
OK or NG
1. OK GO TO 8.
2. NG Refer to "HEADLAMP (FOR USA) ".
CHECK HEADLAMP INPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Stop engine.
2. Disconnect ECM harness connector.
3. Disconnect headlamp LH relay.
4. Check harness continuity between ECM terminal 84 and headlamp LH relay terminal 5 under the following conditions.
  
  Fig 7: Checking Harness Continuity Between ECM Terminal 84 And Headlamp LH Relay Terminal 5
  Courtesy of NISSAN MOTOR CO., U.S.A.
5. Also check harness for short to ground and short to power.
OK or NG
1. OK GO TO 10 .
2. NG GO TO 9.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E1, M1
- Harness connectors M33, F22
- Diode E121
- Harness for open and short between ECM and headlamp LH relay
1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK INTERMITTENT INCIDENT
Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT " .
1. INSPECTION END