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 SPECIFIED CONDITIONS

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

OK or NG

OK: GO TO 2.

NG: GO TO 2.

Fig 1: Checking Voltage Between ECM Terminal 108 And Ground

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

CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ICC brake switch (2) harness connector.
  - Stop lamp switch (1)
3. Turn ignition switch ON.
  
  Fig 2: Identifying Stop Lamp Switch And ICC Brake Switch Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between ICC brake 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 3: Checking Voltage Between ICC Brake 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 ICC brake switch and fuse
  >> Repair open circuit or short to ground or short to power in harness or connectors.
CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ICC brake switch terminal 2 and ECM terminal 108.
  Refer 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.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E108, M15
- Harness for open or short between ICC brake switch and ECM
  >> Repair open circuit or short to ground or short to power in harness or connectors.
CHECK ICC BRAKE SWITCH
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 7.

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

>> INSPECTION END