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Home >> Infiniti >> 2006 >> M45 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - VK45DE - M45 - System & Component Checks, Service Data And Specifications (SDS) >> ICC Brake Switch >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK OVERALL FUNCTION-I 

    With CONSULT-II 

    1. Turn ignition switch ON.
    2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-II.
    3. Check "BRAKE SW1" indication under the following conditions.
    DIAGNOSIS PROCEDURE

    Condition INDICATION
    Brake pedal: Slightly depressed OFF
    Brake pedal: Fully released ON
    Fig 1: Consult-II DATA MONITOR Display Screen
    G04075136Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions.
    DIAGNOSIS PROCEDURE

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

    OK or NG 

    OK: GO TO 2.

    NG: GO TO 3.

    Fig 2: Checking Voltage Between Ground And ECM Terminal 108
    G04075137Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK OVERALL FUNCTION-II 

    With CONSULT-II 

    Check "BRAKE SW2" indication in "DATA MONITOR" mode.

    DIAGNOSIS PROCEDURE

    Condition INDICATION
    Brake pedal: Fully released OFF
    Brake pedal: Slightly depressed ON
    Fig 3: Consult-II DATA MONITOR Display Screen
    G04075138Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    Check voltage between ECM terminal 101 and ground under the following conditions.

    DIAGNOSIS PROCEDURE

    Condition VOLTAGE
    Brake pedal: Fully released Approximately 0V
    Brake pedal: Slightly depressed Battery voltage
    Fig 4: Checking Voltage Between ECM Terminal 101 And Ground
    G04144010Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO 8.

  3. 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 5: Identifying ICC Brake Switch Harness Connector
      G04144011Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ICC brake switch terminal 1 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO 5.

    NG: GO TO 4.

    Fig 6: Checking Voltage Between Connector Terminal 1 and Ground
    G04075143Courtesy of NISSAN MOTOR CO., U.S.A.
  4. 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.

  5. 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 7.

    NG: GO TO 6.

  6. 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.

  7. CHECK ICC BRAKE SWITCH 

    Refer to , "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 15.

    NG: Replace ICC brake switch.

  8. CHECK DTC WITH ICC UNIT 

    Refer to "TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS ".

    OK or NG 

    OK: GO TO 9.

    NG: Repair or replace.

  9. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch (1) harness connector.
      • ICC brake switch (2)
      Fig 7: Identifying Stop Lamp Switch Harness Connector
      G04144013Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Disconnect ICC brake hold relay (1) harness connector.
      • <-: Vehicle front
      Fig 8: Identifying ICC Brake Hold Relay Harness Connector
      G04144014Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

      Fig 9: Checking Voltage Between Stop Lamp Switch Terminal 1 And Ground
      G04144015Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Check voltage between ICC brake hold relay terminal 3 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO 11.

    NG: GO TO 10.

    Fig 10: Checking Voltage Between ICC Brake Hold Relay Terminal 3 And Ground
    G04144016Courtesy of NISSAN MOTOR CO., U.S.A.
  10. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector E101
    • 10A fuse
    • Harness for open or short between battery and stop lamp switch
    • Harness for open or short between battery and ICC brake hold relay

      : Repair open circuit or short to ground or short to power in harness or connectors.

  11. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between the following;

      ECM terminal 101 and stop lamp switch terminal 2,

      ECM terminal 101 and ICC brake hold relay terminal 5.

      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 13.

    NG: GO TO 12.

  12. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E108, M15
    • Harness for open or short between ECM and stop lamp switch
    • Harness for open or short between ECM and ICC brake hold relay

      : Repair open circuit or short to ground or short to power in harness or connectors.

  13. CHECK STOP LAMP SWITCH 

    Refer to , "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 14.

    NG: Replace stop lamp switch.

  14. CHECK ICC BRAKE HOLD RELAY 

    Refer to , "COMPONENT INSPECTION ".

    OK: GO TO 15.

    NG: Replace ICC brake hold relay.

  15. CHECK INTERMITTENT INCIDENT 

    Refer to , "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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