Diagnosis 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

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
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Check voltage between stop lamp switch terminal 1 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 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- 10 A fuse
- Fuse block (J/B) connector E30
- Harness for open and short between stop lamp switch and battery
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 .
  
  Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG

OK: GO TO 5.

NG: 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 6.

NG: Replace stop lamp switch.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

INSPECTION END