Diagnostic Procedure

CHECK STOP LAMP SWITCH CIRCUIT

BRAKE PEDAL AND STOP LAMP REFERENCE

Brake pedal	Stop lamp
Fully released	Not illuminated
Slightly depressed	Illuminated

Ok or NG

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
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- 10A fuse
- Fuse block (J/B) connector E101
- 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. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2. Refer to WIRING DIAGRAM - BRK/SW .
  - Continuity should exist.
3. 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 E110, M7
- 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