LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2023 >> QX55 Essential >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering Control System (Direct Adaptive Steering) (DTC/Circuit Diagnosis) (1 Of 2) >> DTC/Circuit Diagnosis >> DTC C13AC-00: Control Module >> DAST 1 >> Diagnosis Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnosis Procedure

  1. CHECK STEERING FORCE CONTROL MODULE POWER SUPPLY CIRCUIT (1) 
    1. Ignition switch OFF.
    2. Disconnect steering force control module connector.
    3. Check the voltage between steering force control module harness connector and ground.

      +

      -

      Voltage

      (Approx.)

      Steering force control module

      Connector

      Terminal

      E142

      33

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    GO TO 2.

  2. CHECK STEERING FORCE CONTROL MODULE POWER SUPPLY CIRCUIT (2) 
    1. Check the 60A fusible link (#Q).
    2. Check the harness for open or short between steering force control module harness connector E142 terminal 33 and the 60A fusible link (#Q).

    Is the inspection result normal?

    YES

    Perform the trouble diagnosis for battery power supply circuit. Refer to Wiring Diagram.

    GNSW70756Courtesy of NISSAN NORTH AMERICA

    NO

    Repair or replace malfunctioning components.

  3. CHECK STEERING ANGLE SUB CONTROL MODULE POWER SUPPLY CIRCUIT (1) 
    1. Ignition switch OFF.
    2. Disconnect steering angle sub control module connector.
    3. Check the voltage between steering angle sub control module harness connector and ground.

      +

      -

      Voltage

      (Approx.)

      Steering angle sub control module

      Connector

      Terminal

      E145

      33

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    GO TO 4.

  4. CHECK STEERING ANGLE SUB CONTROL MODULE POWER SUPPLY CIRCUIT (2) 
    1. Check the 100A fusible link (#Z).
    2. Check the harness for open or short between steering angle sub control module harness connector E145 terminal 33 and the 100A fusible link (#Z).

    Is the inspection result normal?

    YES

    Perform the trouble diagnosis for battery power supply circuit. Refer to Wiring Diagram.

    GNSW70756Courtesy of NISSAN NORTH AMERICA

    NO

    Repair or replace malfunctioning components.

  5. PERFORM SELF-DIAGNOSIS 

    SYMBOL CONSULT

    1. Ignition switch ON.
    2. Erase "Self Diagnostic Result" mode of "DAST 1".
    3. Ignition switch OFF and wait for at least 10 seconds.
    4. Start the engine.
      CAUTION: Never drive the vehicle.
    5. Select "Self Diagnostic Result" mode of "DAST 1".

    Is DTC "C13AC-00" detected?

    YES

    Replace steering angle main control module. Refer to Removal and Installation

    NO