Diagnostic Procedure

1. Turn ignition switch OFF.
2. Check the stop lamp when depressing and releasing the brake pedal.
   BRAKE PEDAL
   
   

   Brake pedal	Stop lamp
   Fully released	Not illuminated
   Slightly depressed	Illuminated

OK or NG 

OK: GO TO  4.

NG: GO TO 2.

1. Disconnect stop lamp switch harness connector.
   Fig 1: Identifying ASCD Brake Switch Harness Connector

   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.

Check the following.

• 10A 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.

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.

Refer to "COMPONENT INSPECTION ".

OK or NG 

OK: GO TO 6.

NG: Replace stop lamp switch.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END