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Home >> Infiniti >> 2010 >> G37 Base, 2D Convertible >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTC P100A Through P2A03 >> DTC P1572: ICC Brake Switch >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK OVERALL FUNCTION-I

    With CONSULT-III 

    1. Turn ignition switch ON.
    2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-III.
    3. Check "BRAKE SW1" indication under the following conditions.
      MONITOR ITEM CONDITION CHART

      Monitor item Condition Indication
      BRAKE SW1 Brake pedal (A/T)
      Brake pedal or clutch pedal (M/T)      		 Slightly depressed OFF
      Brake pedal (A/T)
      Brake pedal and clutch pedal (M/T)      		 Fully released ON

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connector terminals under the following condtions.
      TERMINAL VOLTAGE REFERENCE CHART

      ECM Condition Voltage (V)
      Connector + -
      Terminal Terminal
      M107 126 (ICC brake switch signal) 128 Brake pedal (A/T)
      Brake pedal or clutch pedal (M/T)      		 Slightly depressed Approx. 0
      Brake pedal (A/T)
      Brake pedal and clutch pedal (M/T)      		 Fully released Battery voltage

      Is the inspection result normal? 

      YES: GO TO 2.

      NO-1: A/T models: GO TO  3.

      NO-2: M/T models: GO TO  8.

  2. CHECK OVERALL FUNCTION-II

    With CONSULT-III 

    Select "BRAKE SW2" and check indication under the following conditions.

    MONITOR ITEM CONDITION CHART

    Monitor item Condition Indication
    BRAKE SW2 Brake pedal Slightly depressed ON
    Fully released OFF

    Without CONSULT-III 

    Check the voltage between ECM harness connector terminals as per the following.

    TERMINAL VOLTAGE REFERENCE CHART

    ECM Condition Voltage (V)
    Connector + -
    Terminal Terminal
    M107 122 (Stop lamp switch signal) 128 Brake pedal Slightly depressed Battery voltage
    Fully released Approx. 0

    Is the inspection result normal? 

    YES: GO TO  22.

    NO: GO TO  16.

  3. CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ICC brake switch harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between ICC brake switch harness connector and ground.
      TERMINAL VOLTAGE REFERENCE CHART

      ICC brake switch Ground Voltage
      Connector Terminal
      E114 1 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E103
    • 10 A fuse (No. 3)
    • Harness for open or short between ICC brake switch and fuse

      Repair open circuit or short to ground 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 the continuity between ICC brake switch harness connector and ECM harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      ICC brake switch ECM Continuity
      Connector Terminal Connector Terminal
      E114 2 M107 126 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E106, M6
    • Harness for open or short between ICC brake switch and ECM

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

  7. CHECK ICC BRAKE SWITCH

    Refer to "COMPONENT INSPECTION (ICC BRAKE SWITCH) ".

    Is the inspection result normal? 

    YES: GO TO  22.

    NO: Replace ICC brake switch.

  8. CHECK ICC CLUTCH SWITCH CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ICC brake switch harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between ICC brake switch harness connector and ground.
      TERMINAL VOLTAGE REFERENCE CHART

      ICC brake switch Ground Condition Voltage (V)
      Connector Terminal
      E114 1 Ground Clutch pedal Slightly depressed Approx. 0
      Fully released Battery voltage

      Is the inspection result normal? 

      YES: GO TO  13.

      NO: GO TO 9.

  9. CHECK ICC CLUTCH SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ICC clutch switch harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between ICC clutch switch harness connector and ground.
      TERMINAL VOLTAGE REFERENCE CHART

      ICC clutch switch Ground Voltage
      Connector Terminal
      E113 1 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  11.

      NO: GO TO 10.

  10. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E103
    • 10 A fuse (No. 3)
    • Harness for open or short between ICC clutch switch and fuse

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

  11. CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I
    1. Turn ignition switch OFF.
    2. Check the continuity between ICC clutch switch harness connector and ICC brake switch harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      ICC clutch switch ICC brake switch Continuity
      Connector Terminal Connector Terminal
      E113 2 E114 1 Existed
    3. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 12.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

  12. CHECK ICC CLUTCH SWITCH

    Refer to "COMPONENT INSPECTION (ICC CLUTCH SWITCH) ".

    Is the inspection result normal? 

    YES: GO TO  22.

    NO: Replace ICC clutch switch.

  13. CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between ICC brake switch harness connector and ECM harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      ICC brake switch ECM Continuity
      Connector Terminal Connector Terminal
      E114 2 M107 126 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  15.

      NO: GO TO 14.

  14. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E106, M6
    • Harness for open or short between ICC brake switch and ECM

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

  15. CHECK ICC BRAKE SWITCH

    Refer to "COMPONENT INSPECTION (ICC BRAKE SWITCH) ".

    Is the inspection result normal? 

    YES: GO TO  22.

    NO: Replace ICC brake switch.

  16. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch harness connector.
    3. Disconnect ICC brake hold relay harness connector.
    4. Check the voltage between stop lamp switch harness connector and ground.
      TERMINAL VOLTAGE REFERENCE CHART

      Stop lamp switch Ground Voltage
      Connector Terminal
      E110 3 Ground Battery voltage
    5. Check the voltage between ICC brake hold relay harness connector and ground.
      TERMINAL VOLTAGE REFERENCE CHART

      ICC brake hold relay Ground Voltage
      Connector Terminal
      E51 3 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  18.

      NO: GO TO 17.

  17. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E103
    • 10 A fuse (No. 7)
    • 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 in harness or connectors.

  18. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Disconnect ECM harness connector.
    2. Check the continuity between stop lamp switch harness connector and ECM harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      Stop lamp switch ECM Continuity
      Connector Terminal Connector Terminal
      E110 4 M107 122 Existed
    3. Check the continuity between ICC brake hold relay harness connector and ECM harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      ICC brake hold relay ECM Continuity
      Connector Terminal Connector Terminal
      E51 5 M107 122 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  20.

      NO: GO TO 19.

  19. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E103, M2
    • 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, short to ground or short to power in harness or connectors.

  20. CHECK STOP LAMP SWITCH

    Refer to "COMPONENT INSPECTION (STOP LAMP SWITCH) ".

    Is the inspection result normal? 

    YES: GO TO 21.

    NO: Replace stop lamp switch.

  21. CHECK ICC BRAKE HOLD RELAY

    Refer to "COMPONENT INSPECTION (ICC BRAKE HOLD RELAY) ".

    Is the inspection result normal? 

    YES: GO TO 22.

    NO: Replace ICC brake hold relay.

  22. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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