LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2012 >> G25 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Brake System) >> DTC/Circuit Diagnosis >> DTC C1A60: Control Module >> Diagnosis Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Nissan Leaf. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK 12V BATTERY
    1. Turn the power switch OFF.
    2. Check the 12V battery terminal connections. Refer to "WORK FLOW ".
    3. Check the 12V battery. Refer to "WORK FLOW ".

    Is the inspection result normal? 

    YES: Go to 2.

    NO: Repair or replace malfunctioning parts and Go to 2.

  2. PERFORM SELF-DIAGNOSIS (1)

    With CONSULT

    1. Connect 12V battery cable to negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    2. Turn the power switch OFF to ON.
      CAUTION: Never engage READY state.
    3. Repeat step  2 for 2 times or more.
      CAUTION: Be sure to wait for 5 seconds or more after turning the power switch OFF.
    4. Turn the power switch OFF.
    5. Close all doors including the back door, and wait outside of vehicle for 5 minutes or more.
    6. Turn the power switch ON.
      CAUTION: Never engage READY state.
    7. Erase self-diagnosis result of "BRAKE".
      CAUTION: Turn the power switch OFF and wait 5 minutes or more after erase self-diagnosis result.
    8. Depress brake pedal by 100 mm (3.94 in) or more, and hold the position for 5 seconds or more.
    9. Release brake pedal.
    10. Repeat steps  8 to  9 for 3 times.
    11. Perform "BRAKE" self-diagnosis.

    Is DTC "C1A60" detected? 

    YES: Go to 3.

    NO: INSPECTION END

  3. CHECK CONNECTOR TERMINALS
    1. Close all doors including the back door, and wait outside of vehicle for 5 minutes or more.
      CAUTION: Never depress brake pedal.
    2. Disconnect 12V battery cable from negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    3. Disconnect the electrically-driven intelligent brake unit harness connector, then check for failures of pin terminals and connections.

    Is the inspection result normal? 

    YES: Go to  5.

    NO: Repair or replace malfunctioning parts and Go to 4.

  4. PERFORM SELF-DIAGNOSIS (2)

    With CONSULT

    1. Connect the electrically-driven intelligent brake unit harness connector.
    2. Connect 12V battery cable to negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    3. Turn the power switch OFF to ON.
      CAUTION: Never engage READY state.
    4. Repeat step  3 for 2 times or more.
      CAUTION: Be sure to wait for 5 seconds or more after turning the power switch OFF.
    5. Turn the power switch OFF.
    6. Close all doors including the back door, and wait outside of vehicle for 5 minutes or more.
    7. Turn the power switch ON.
      CAUTION: Never engage READY state.
    8. Erase self-diagnosis result of "BRAKE".
      CAUTION: Turn the power switch OFF and wait 5 minutes or more after erase self-diagnosis result.
    9. Depress brake pedal by 100 mm (3.94 in) or more, and hold the position for 5 seconds or more.
    10. Release brake pedal.
    11. Repeat steps  9 to  10 for 3 times.
    12. Perform "BRAKE" self-diagnosis.

    Is DTC "C1A60" detected? 

    YES: Go to 5.

    NO: INSPECTION END

  5. CHECK POWER SWITCH ON POWER SUPPLY
    1. Connect the electrically-driven intelligent brake unit harness connector.
    2. Connect 12V battery cable to negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    3. Turn the power switch OFF.
    4. Close all doors including the back door, and wait outside of vehicle for 5 minutes or more.
      CAUTION: Never depress brake pedal.
    5. Disconnect 12V battery cable from negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    6. Disconnect the electrically-driven intelligent brake unit harness connector.
    7. Connect 12V battery cable to negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    8. Check voltage between the electrically-driven intelligent brake unit harness connector and ground.
      VOLTAGE REFERENCE

      Electrically-driven intelligent brake unit - Voltage
      Connector Terminal
      E34 26 Ground Approximately 0 V
    9. Turn the power switch ON.
      CAUTION: Never engage READY state.
    10. Check voltage between the electrically-driven intelligent brake unit harness connector and ground.
    VOLTAGE REFERENCE

    Electrically-driven intelligent brake unit - Voltage
    Connector Terminal
    E34 26 Ground 10 - 16 V

    Is the inspection result normal? 

    YES: Go to  8.

    NO: Go to 6.

  6. CHECK POWER SWITCH ON POWER SUPPLY CIRCUIT
    1. Turn the power switch OFF.
    2. Disconnect 12V battery cable from negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    3. Check 15A fuse (#62).
    4. Disconnect IPDM E/R harness connector.
    5. Check continuity between electrically-driven intelligent brake unit and IPDM E/R.
      CONTINUITY REFERENCE

      Electrically-driven intelligent brake unit IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E34 26 E15 62 Existed
    6. Check continuity between electrically-driven intelligent brake unit harness connector and ground.
    CONTINUITY REFERENCE

    Electrically-driven intelligent brake unit - Continuity
    Connector Terminal
    E34 26 Ground Not existed

    Is the inspection result normal? 

    YES: Perform diagnosis of power system with power switch ON. Refer to "WIRING DIAGRAM - ON POWER SUPPLY - ".

    NO: Repair or replace malfunctioning parts and Go to 7.

  7. PERFORM SELF-DIAGNOSIS (3)

    With CONSULT

    1. Connect the electrically-driven intelligent brake unit harness connector.
    2. Connect IPDM E/R harness connector.
    3. Connect 12V battery cable to negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    4. Turn the power switch OFF to ON.
      CAUTION: Never engage READY state.
    5. Repeat step  4 for 2 times or more.
      CAUTION: Be sure to wait for 5 seconds or more after turning the power switch OFF.
    6. Turn the power switch OFF.
    7. Close all doors including the back door, and wait outside of vehicle for 5 minutes or more.
    8. Turn the power switch ON.
      CAUTION: Never engage READY state.
    9. Erase self-diagnosis result of "BRAKE".
      CAUTION: Turn the power switch OFF and wait 5 minutes or more after erase self-diagnosis result.
    10. Depress brake pedal by 100 mm (3.94 in) or more, and hold the position for 5 seconds or more.
    11. Release brake pedal.
    12. Repeat steps  10 to  11 for 3 times.
    13. Perform "BRAKE" self-diagnosis.

    Is DTC "C1A60" detected? 

    YES: Go to 8.

    NO: INSPECTION END

  8. CHECK 12V BATTERY POWER SUPPLY
    1. Turn the power switch OFF.
    2. Disconnect 12V battery cable to negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    3. Disconnect the electrically-driven intelligent brake unit harness connector.
    4. Connect 12V battery cable to negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    5. Check voltage between the electrically-driven intelligent brake unit harness connector terminals.
      VOLTAGE REFERENCE

      Electrically-driven intelligent brake unit Voltage
      Connector Terminal
      E34 1 - 31 10 - 16 V
      2 - 31
      11 - 31
    6. Turn the power switch ON.
      CAUTION: Never engage READY state.
    7. Check voltage between the electrically-driven intelligent brake unit harness connector terminals.
    VOLTAGE REFERENCE

    Electrically-driven intelligent brake unit Voltage
    Connector Terminal
    E34 1 - 31 10 - 16 V
    2 - 31
    11 - 31

    Is the inspection result normal? 

    YES: Go to  11.

    NO: Go to 9.

  9. CHECK 12V BATTERY POWER SUPPLY CIRCUIT
    1. Turn the power switch OFF.
    2. Disconnect 12V battery cable to negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    3. Check 60A fusible link (#F).
    4. Check continuity and for short circuit between harness connector terminal 1 of electrically-driven intelligent brake unit and 60A fusible link (#F).
    5. Check continuity and for short circuit between harness connector terminal 2 of electrically-driven intelligent brake unit and 60A fusible link (#F).
    6. Check 10A fuse (#78).
    7. Check continuity and for short circuit between harness connector terminal 11 of electrically-driven intelligent brake unit and 10A fuse (#78).

    Is the inspection result normal? 

    YES: Perform diagnosis for 12V battery power supply. Refer to "WIRING DIAGRAM - BATTERY POWER SUPPLY - ".

    NO: Repair or replace malfunctioning parts and Go to 10.

  10. PERFORM SELF-DIAGNOSIS (4)

    With CONSULT

    1. Connect the electrically-driven intelligent brake unit harness connector.
    2. Connect 12V battery cable to negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    3. Turn the power switch OFF to ON.
      CAUTION: Never engage READY state.
    4. Repeat step  3 for 2 times or more.
      CAUTION: Be sure to wait for 5 seconds or more after turning the power switch OFF.
    5. Turn the power switch OFF.
    6. Close all doors including the back door, and wait outside of vehicle for 5 minutes or more.
    7. Turn the power switch ON.
      CAUTION: Never engage READY state.
    8. Erase self-diagnosis result of "BRAKE".
      CAUTION: Turn the power switch OFF and wait 5 minutes or more after erase self-diagnosis result.
    9. Depress brake pedal by 100 mm (3.94 in) or more, and hold the position for 5 seconds or more.
    10. Release brake pedal.
    11. Repeat steps  9 to  10 for 3 times.
    12. Perform "BRAKE" self-diagnosis.

    Is DTC "C1A60" detected? 

    YES: Go to 11.

    NO: INSPECTION END

  11. CHECK GROUND CIRCUIT
    1. Disconnect 12V battery cable to negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    2. Disconnect the electrically-driven intelligent brake unit harness connector.
    3. Check continuity between electrically-driven intelligent brake unit and ground.
    CONTINUITY REFERENCE

    Electrically-driven intelligent brake unit - Continuity
    Connector Terminal
    E34 31 Ground Existed

    Is the inspection result normal? 

    YES: Go to  13.

    NO: Repair or replace malfunctioning parts and Go to 12.

  12. PERFORM SELF-DIAGNOSIS (5)

    With CONSULT

    1. Connect the electrically-driven intelligent brake unit harness connector.
    2. Connect 12V battery cable to negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    3. Turn the power switch OFF to ON.
      CAUTION: Never engage READY state.
    4. Repeat step  3 for 2 times or more.
      CAUTION: Be sure to wait for 5 seconds or more after turning the power switch OFF.
    5. Turn the power switch OFF.
    6. Close all doors including the back door, and wait outside of vehicle for 5 minutes or more.
    7. Turn the power switch ON.
      CAUTION: Never engage READY state.
    8. Erase self-diagnosis result of "BRAKE".
      CAUTION: Turn the power switch OFF and wait 5 minutes or more after erase self-diagnosis result.
    9. Depress brake pedal by 100 mm (3.94 in) or more, and hold the position for 5 seconds or more.
    10. Release brake pedal.
    11. Repeat steps  9 to  10 for 3 times.
    12. Perform "BRAKE" self-diagnosis.

    Is DTC "C1A60" detected? 

    YES: Go to 13.

    NO: INSPECTION END

  13. CHECK DATA MONITOR

    With CONSULT

    1. Connect the electrically-driven intelligent brake unit harness connector.
    2. Connect 12V battery cable to negative terminal. Refer to "REMOVAL AND INSTALLATION ".
    3. Turn the power switch OFF to ON.
      CAUTION: Never engage READY state.
    4. Repeat step  3 for 2 times or more.
      CAUTION: Be sure to wait for 5 seconds or more after turning the power switch OFF.
    5. Select "BRAKE" and "DATA MONITOR" according this order.
    6. Check "MOTOR POWER SUPPLY" and "CONTROL MODULE POWER". Refer to "REFERENCE VALUE ".

    Is the inspection result normal? 

    YES: Go to 14.

    NO: Replace the electrically-driven intelligent brake unit. Refer to "REMOVAL AND INSTALLATION ".

  14. PERFORM SELF-DIAGNOSIS (6)

    With CONSULT

    1. Turn the power switch OFF to ON.
      CAUTION: Never engage READY state.
    2. Repeat step  1 for 2 times or more.
      CAUTION: Be sure to wait for 5 seconds or more after turning the power switch OFF.
    3. Turn the power switch OFF.
    4. Close all doors including the back door, and wait outside of vehicle for 5 minutes or more.
    5. Turn the power switch ON.
      CAUTION: Never engage READY state.
    6. Erase self-diagnosis result of "BRAKE".
      CAUTION: Turn the power switch OFF and wait 5 minutes or more after erase self-diagnosis result.
    7. Depress brake pedal by 100 mm (3.94 in) or more, and hold the position for 5 seconds or more.
    8. Release brake pedal.
    9. Repeat steps  7 to  8 for 3 times.
    10. Perform "BRAKE" self-diagnosis.

    Is DTC "C1A60" detected? 

    YES: Replace the electrically-driven intelligent brake unit. Refer to "REMOVAL AND INSTALLATION ".

    NO: INSPECTION END

scientia non olet · About LEMON Manuals