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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis (Single Page) >> Steering >> Steering Control Systems >> Steering Control System (Direct Adaptive Steering) (DTC/Circuit Diagnosis) (1 Of 2) >> DTC/Circuit Diagnosis >> C13BC-00 Control Module IGN Power Sup >> DTC Diagnosis Procedure
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DTC Diagnosis Procedure

  1. CHECK IGNITION POWER SUPPLY FOR STEERING ANGLE MAIN CONTROL MODULE 
      1. Ignition switch OFF.
      2. Disconnect steering angle main control module connector.
      3. Check the voltage between steering angle main control module harness connector and ground.
        (+) (-) Voltage(Approx.)
        Steering angle main control module
        Connector Terminal
        E149 25 Ground 0 V
      4. Ignition switch ON.
      5. Check the voltage between steering angle main control module harness connector and ground.
        (+) (-) Voltage(Approx.)
        Steering angle main control module
        Connector Terminal
        E149 25 Ground Battery voltage

    Is the inspection result normal?

    YES>>

    GO TO 2.

    NO>>

    GO TO 3.

  2. CHECK INTERMITTENT INCIDENT FOR STEERING ANGLE MAIN CONTROL MODULE 
      1. Ignition switch OFF.
      2. Check enlarged contact spring of terminal. Refer to How to Check Terminal .
      3. Perform intermittent incident while turning steering wheel. Refer to Intermittent Incident .

    Is the inspection result normal?

    YES>>

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

    NO>>

    Repair or replace malfunctioning component.

  3. CHECK IGNITION POWER SUPPLY CIRCUIT (1) 
      1. Ignition switch OFF.
      2. Disconnect steering angle main control module connector and steering angle sub control module connector.
      3. Check the continuity between steering angle main control module harness connector and steering angle sub control module harness connector.
        Steering angle main control module Steering angle sub control module Continuity
        Connector Terminal Connector Terminal
        E149 25 E144 27 Yes

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    Repair or replace malfunctioning component.

  4. CHECK INTERNAL CIRCUIT IN STEERING ANGLE SUB CONTROL MODULE 
    1. Check the continuity between steering angle sub control module harness connector terminals.
      Steering angle sub control module Continuity
      Terminals
      25 27 Yes

    Is the inspection result normal?

    YES>>

    GO TO 5.

    NO>>

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

  5. CHECK IGNITION POWER SUPPLY FOR STEERING ANGLE SUB CONTROL MODULE 
      1. Check the voltage between steering angle sub control module harness connector and ground.
        (+) (-) Voltage(Approx.)
        Steering angle sub control module
        Connector Terminal
        E144 25 Ground 0 V
      2. Ignition switch ON.
      3. Check the voltage between steering angle sub control module harness connector and ground.
        (+) (-) Voltage(Approx.)
        Steering angle sub control module
        Connector Terminal
        E144 25 Ground Battery voltage

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

    GO TO 7.

  6. CHECK INTERMITTENT INCIDENT FOR STEERING ANGLE SUB CONTROL MODULE 
      1. Ignition switch OFF.
      2. Check enlarged contact spring of terminal. Refer to How to Check Terminal .
      3. Perform intermittent incident while turning steering wheel. Refer to Intermittent Incident .

    Is the inspection result normal?

    YES>>

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

    NO>>

    Repair or replace malfunctioning component.

  7. CHECK IGNITION POWER SUPPLY CIRCUIT (2) 
      1. Ignition switch OFF.
      2. Disconnect steering force control module connector.
      3. Check the continuity between steering angle sub control module harness connector and steering force control module harness connector.
        Steering angle sub control module Steering force control module Continuity
        Connector Terminal Connector Terminal
        E144 25 E141 27 Yes

    Is the inspection result normal?

    YES>>

    GO TO 8.

    NO>>

    Repair or replace malfunctioning component.

  8. CHECK INTERNAL CIRCUIT IN STEERING FORCE CONTROL MODULE 
    1. Check the continuity between steering force control module harness connector terminals.
      Steering force control module Continuity
      Terminals
      25 27 Yes

    Is the inspection result normal?

    YES>>

    GO TO 9.

    NO>>

    Replace steering force control module. Refer to Removal and Installation .

  9. CHECK IGNITION POWER SUPPLY FOR STEERING FORCE CONTROL MODULE 
      1. Check the voltage between steering force control module harness connector and ground.
        (+) (-) Voltage(Approx.)
        Steering force control module
        Connector Terminal
        E141 25 Ground 0 V
      2. Ignition switch ON.
      3. Check the voltage between force control module harness connector and ground.
        (+) (-) Voltage(Approx.)
        Steering force control module
        Connector Terminal
        E141 25 Ground Battery voltage

    Is the inspection result normal?

    YES>>

    GO TO 10.

    NO>>

    GO TO 11.

  10. CHECK INTERMITTENT INCIDENT FOR STEERING FORCE CONTROL MODULE 
      1. Ignition switch OFF.
      2. Check enlarged contact spring of terminal. Refer to How to Check Terminal .
      3. Perform intermittent incident while turning steering wheel. Refer to Intermittent Incident .

    Is the inspection result normal?

    YES>>

    Replace steering force control module. Refer to Removal and Installation .

    NO>>

    Repair or replace malfunctioning component.

  11. CHECK IGNITION POWER SUPPLY CIRCUIT (3) 
      1. Ignition switch OFF.
      2. Check the 10A fuse (#53).
      3. Check the harness for open or short between steering force control module harness connector E141 terminal 25 and the 10A fuse (#53).

    Is the inspection result normal?

    YES>>

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

    NO>>

    Repair or replace malfunctioning component.

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