Diagnosis Procedure

CHECK STOP LAMP SWITCH CIRCUIT

Turn ignition switch OFF.

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

BRAKE PEDAL FUNCTION CHART

Brake pedal	Stop lamp
Fully released	Not illuminated
Slightly 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: Identifying ASCD Brake Switch And Clutch Pedal
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check voltage between stop lamp switch terminal 3 and ground with CONSULT-III 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 3 And 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. Disconnect stop lamp switch harness connector.
3. Check harness continuity between ECM terminal 122 and stop lamp switch terminal 4.
  Refer to WIRING DIAGRAM .
  
  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.
  
  Fig 3: Identifying ASCD Brake Switch And Clutch Pedal
  Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E108, M15
- 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