Diagnostic Procedure

CHECK OVERALL FUNCTION-I

With CONSULT-III

Turn ignition switch ON.
Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-III.

Check "BRAKE SW1" indication under the following conditions.

BRAKE SWITCH INDICATION CONDITIONS

CONDITION	INDICATION
Brake pedal: Slightly depressed	OFF
Brake pedal: Fully released	ON

Without CONSULT-III

Turn ignition switch ON.

Check voltage between ECM terminal 108 and ground under the following conditions.

VOLTAGE REFERENCE

CONDITION	VOLTAGE
Brake pedal: Slightly depressed	Approximately 0V
Brake pedal: Fully released	Battery voltage

Fig 1: Checking Voltage Between ECM Terminal 108 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 2.

NG: GO TO 2.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch (2) harness connector.
  - Stop lamp switch (1)
3. Turn ignition switch ON.
  
  Fig 2: Identifying Stop Lamp Switch And ASCD Brake Switch Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-III or tester.
  Voltage: Battery voltage
OK or NG

OK: GO TO 4.

NG: GO TO 4.

Fig 3: Checking Voltage Between ASCD Switch Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Fuse block (J/B) connector E102
- 10A fuse
- Harness for open or short between ASCD brake switch and fuse
  >> Repair open circuit or short to ground or short to power in harness or connectors.
CHECK ASCD BRAKE 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 108 and ASCD brake switch terminal 2.
  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 6.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E108, M15
- Harness for open or short between ECM and ASCD brake switch
  >> Repair open circuit or short to ground or short to power in harness or connectors.
CHECK ASCD BRAKE SWITCH
Refer to "COMPONENT INSPECTION "

OK or NG

OK: GO TO 7.

NG: Replace ASCD brake switch.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

>> INSPECTION END