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Home >> Infiniti >> 2010 >> M45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1550 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.
    INDICATION CONDITION CHART

    CONDITION INDICATION
    Brake pedal: Fully released ON
    Brake pedal: Slightly depressed OFF

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions.
    VOLTAGE CONNECTOR TERMINALS REFERENCE CHART

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

    OK or NG 

    OK: GO TO 2.

    NG: GO TO  3.

    Fig 1: Checking Voltage Between ECM Terminal 108 And Ground
    G04900670Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK OVERALL FUNCTION-II

    With CONSULT-III 

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

    INDICATION CONDITION CHART

    CONDITION INDICATION
    Brake pedal: Fully released OFF
    Brake pedal: Slightly depressed ON

    Without CONSULT-III 

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

    VOLTAGE CONNECTOR TERMINALS REFERENCE CHART

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

    OK or NG 

    OK: GO TO  15.

    NG: GO TO  8.

    Fig 2: Checking Voltage Between ECM Terminal 101 And Ground
    G04875395Courtesy of NISSAN MOTOR CO., U.S.A.
  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 3: Identifying ICC Brake Switch And Stop Lamp Switch
      G05210064Courtesy 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  5.

    NG: GO TO 4.

    Fig 4: Checking Voltage Between ICC Brake Switch Terminal 1 And Ground
    G04875403Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E102
    • 10 A 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 to SYSTEM WIRING DIAGRAMS S article.

      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 SENSOR INTEGRATED UNIT

    Refer to "SELF-DIAGNOSTIC FUNCTION ".

    OK or NG 

    OK: GO TO 9.

    NG: Repair or replace malfunctioning part.

  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 5: Identifying ICC Brake Switch And Stop Lamp Switch
      G05210064Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Disconnect ICC brake hold relay (1) harness connector.
      • Vehicle Front
      Fig 6: Identifying ICC Brake Hold Relay Harness Connector
      G06303383Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

      Fig 7: Checking Voltage Between Stop Lamp Switch Terminal 1 And Ground
      G05210075Courtesy of NISSAN MOTOR CO., U.S.A.
    5. 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  11.

    NG: GO TO 10.

    Fig 8: Checking Voltage Between ICC Brake Hold Relay Terminal 3 And Ground
    G05210076Courtesy of NISSAN MOTOR CO., U.S.A.
  10. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E101
    • 10 A 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 SYSTEM WIRING DIAGRAMS article.

      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 "DIAGNOSIS PROCEDURE ".

    INSPECTION END 

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