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Home >> Infiniti >> 2010 >> M35 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1217 To P2A03 >> DTC P1572: ICC Brake Switch >> Diagnosis Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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 Slightly depressed OFF
      Fully released ON

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connector terminals under the following conditions.
      Fig 1: Checking Voltage Between ECM Harness Connector Terminals
      G06306755Courtesy of NISSAN MOTOR CO., U.S.A.
      CONNECTOR TERMINAL VOLTAGE CHART

      ECM Condition Voltage (V)
      Connector + -
      Terminal Terminal
      M9 126 (ICC brake switch signal) 128 Brake pedal Slightly depressed Approx. 0
      Fully released Battery voltage

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: GO TO  3.

  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 under the following conditions.

    Fig 2: Checking Voltage Between ECM Harness Connector Terminals
    G06306756Courtesy of NISSAN MOTOR CO., U.S.A.
    CONNECTOR TERMINAL VOLTAGE CHART

    ECM Condition Voltage (V)
    Connector + -
    Terminal Terminal
    M9 122 (Stop lamp switch signal) 128 Brake pedal Slightly depressed Battery voltage
    Fully released Approx. 0

    Is the inspection result normal? 

    YES: GO TO  15.

    NO: GO TO  8.

  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.
      CONNECTOR TERMINAL VOLTAGE CHART

      ICC brake switch Ground Voltage
      Connector Terminal
      E111 1 Ground Battery voltage
      Fig 3: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
      G04875403Courtesy of NISSAN MOTOR CO., U.S.A.

      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 E102
    • 10 A fuse (No. 12)
    • Harness for open or short between ICC brake hold relay switch and fuse

      Repair open circuit, 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 the continuity between ICC brake switch harness connector and ECM harness connector.
      CONNECTOR TERMINAL CONTINUITY CHART

      ICC brake switch ECM Continuity
      Connector Terminal Connector Terminal
      E111 2 M9 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 E108, M15
    • 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  15.

    NO: Replace ICC brake switch.

  8. CHECK DTC WITH ICC SENSOR INTEGRATED UNIT

    Refer to "DIAGNOSTIC TROUBLE CODE (DTC) CHART ".

    Is the inspection result normal? 

    YES: GO TO 9.

    NO: Repair or replace.

  9. 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.
    4. Check the voltage between stop lamp switch harness connector and ground.
      CONNECTOR TERMINAL VOLTAGE CHART

      Stop lamp switch Ground Voltage
      Connector Terminal
      E124 1 Ground Battery voltage
      Fig 4: Checking Voltage Between Stop Lamp Switch Terminal 1 And Ground
      G05210075Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Check the voltage between ICC brake hold relay harness connector and ground.
      CONNECTOR TERMINAL VOLTAGE CHART

      ICC brake hold relay Ground Voltage
      Connector Terminal
      E80 3 Ground Battery voltage
      Fig 5: Checking Voltage Between ICC Brake Hold Relay Terminal 3 And Ground
      G05210076Courtesy of NISSAN MOTOR CO., U.S.A.

      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 E101
    • 10 A fuse (No. 20)
    • 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, 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 the continuity between stop lamp switch harness connector and ECM harness connector.
      CONNECTOR TERMINAL CONTINUITY CHART

      Stop lamp switch ECM Continuity
      Connector Terminal Connector Terminal
      E124 2 M9 122 Existed
    3. Check the continuity between ICC brake hold relay harness connector and ECM harness connector.
      CONNECTOR TERMINAL CONTINUITY CHART

      ICC brake hold relay ECM Continuity
      Connector Terminal Connector Terminal
      E80 5 M9 122 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  13.

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

  13. CHECK STOP LAMP SWITCH

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

    Is the inspection result normal? 

    YES: GO TO 14.

    NO: Replace stop lamp switch.

  14. CHECK ICC BRAKE HOLD RELAY

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

    Is the inspection result normal? 

    YES: GO TO 15.

    NO: Replace ICC brake hold relay.

  15. CHECK INTERMITTENT INCIDENT

    Refer to "DESCRIPTION ".

    INSPECTION END

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