Diagnostic Procedure

CHECK STOP LAMP SWITCH CIRCUIT

Turn ignition switch OFF.

Check the stop lamp when depressing and releasing the brake pedal.

BRAKE PEDAL CONDITION AND STOP LAMP ILLUMINATION

Brake pedal	Stop lamp
Fully released	Not illuminated
Depressed	Illuminated

OK or NG

OK: GO TO 4.
NG: GO TO 2.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Disconnect stop lamp switch harness connector.
  
  Fig 1: Disconnecting Stop Lamp Switch Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester.
  Voltage: Battery voltage
OK or NG
- OK: GO TO 4.
- NG: GO TO 3.
  
  Fig 2: Checking Voltage Between Stop Lamp Switch Terminal 1 & Ground With CONSULT-II Or Tester
  Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- 10A fuse
- Fuse block (J/B) connector E30
- Harness for open and short between stop lamp switch and fuse
- Repair open circuit or short to ground or short to power in harness or connectors.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
  Refer to WIRING DIAGRAM - BRK/SW .
  
  Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
- OK: GO TO 6.
- NG: GO TO 5.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E25, M90
- Harness for open or short between ECM and stop lamp switch
- Repair open circuit or short to ground or short to power in harness or connectors.
CHECK STOP LAMP SWITCH
Refer to COMPONENT INSPECTION .

OK or NG
- OK: GO TO 7.
- NG: Replace stop lamp switch.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
- INSPECTION END