Diagnostic Procedure

CHECK REAR WINDOW DEFOGGER CIRCUIT OVERALL FUNCTION

With CONSULT-II

Turn ignition switch ON.
Check "LOAD SIGNAL" in "DATA MONITOR" mode with CONSULT-II under the following conditions.

LOAD SIGNAL CONDITION CHART

Condition	LOAD SIGNAL
Rear window defogger switch: ON	ON
Rear window defogger switch: OFF	OFF

Fig 1: Generic Scan Tool - Data Monitor

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: INSPECTION END

NG: GO TO 4.

CHECK REAR WINDOW DEFOGGER CIRCUIT OVERALL FUNCTION

Without CONSULT-II

Turn ignition switch ON.
Check voltage between ECM terminal 93 and ground under the following conditions.

VOLTAGE SPECIFICATION

Condition	Voltage
Rear window defogger switch: ON	BATTERY VOLTAGE
Rear window defogger switch: OFF	Approximately 0V

Fig 2: Checking Voltage Between ECM Terminal 93 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: INSPECTION END

NG: GO TO 4.

CHECK REAR WINDOW DEFOGGER FUNCTION
1. Turn rear window defogger switch ON.
2. Check the rear windshield. Is the rear windshield heated up?
Yes or No

Yes: GO TO 5.

No: Refer to "REAR WINDOW DEFOGGER "
CHECK REAR WINDOW DEFOGGER INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn rear window defogger switch OFF.
2. Turn ignition switch OFF.
3. Disconnect ECM harness connector and rear window defogger relay.
4. Check harness continuity between ECM terminal 93 and rear window defogger relay terminals 5.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG

OK: GO TO 7.

NG: GO TO 6.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B1, M17
- Harness for open or short between ECM and rear window defogger relay.
  Repair open circuit or short to ground or short to power in harness or connectors.
CHECK INTERMITTENT INCIDENT
Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

INSPECTION END