Diagnostic Procedure

CHECK OVERALL FUNCTION

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 AND BRAKE PEDAL CONDITION

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.

BRAKE PEDAL POSITION AND VOLTAGE REFERENCE

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

OK or NG

OK: GO TO INSPECTION END .

NG: GO TO 2.

Fig 1: Checking Voltage Between ECM Terminal 108 And Ground

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

CHECK DTC WITH ICC UNIT
Refer to "TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS ".

OK or NG

OK: GO TO 3.

NG: Repair or replace.
CHECK ICC BRAKE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ICC brake hold relay.
3. Turn ignition switch ON.
  
  Fig 2: Identifying Battery And ICC Brake Hold Relay
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check voltage between ICC brake hold relay terminal 3 and ground with CONSULT-III or tester.
  Voltage: Battery voltage
OK or NG

OK: GO TO 8.

NG: GO TO 4.

Fig 3: Checking Voltage Between ICC Brake Hold Relay Terminal 3 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 harness connector.
3. Turn ignition switch ON.
  
  Fig 4: Identifying ICC Brake Switch And Stop Lamp Switch
  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 6.

NG: GO TO 5.

Fig 5: 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 E201
- 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-I
1. Turn ignition switch OFF.
2. Check harness continuity between ICC brake hold relay terminal 3 and ICC brake 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 7.

NG: 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 11.

NG: Replace ICC brake switch.
CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ICC brake hold relay terminal 4 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 10.

NG: GO TO 9.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E211, M41
- Harness for open or short between ICC brake hold relay and ECM
  >> Repair open circuit or short to ground or short to power in harness or connectors.
CHECK ICC BRAKE HOLD RELAY
Refer to "COMPONENT INSPECTION ".

OK: GO TO 11.

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

>> INSPECTION END