PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A65, C1A9A, C1A9B, C1A9C

DTC Code DTC Name
C1A65 Right Active Headrest System
C1A9A Front Capacitive Sensor RH
C1A9B Open in Front Motor Line RH Circuit
C1A9C Front Headrest Control ECU RH Writing Error

DESCRIPTION

When the active headrest ECU detects an internal malfunction in the headrest, DTC C1A9A, C1A9B and C1A9C are stored.

When the driving support ECU receives a signal indicating a malfunction from the active headrest ECU, DTC C1A65 is stored.

DTC Code DTC Detection Condition Trouble Area
C1A65

  1. Power switch ON (IG)

  2. Signal indicating malfunction received from active headrest ECU

  3. 2 seconds or more

  • Front seat headrest assembly RH

  • Driving support ECU
C1A9A

  1. Short circuits are detected when power switch is turned ON (IG), and open circuits are detected when performing Active Test

  2. Head position detection sensor in headrest has open or short circuit

  3. 1 second (for short circuits, DTC is stored when malfunction is detected 5 times consecutively after power switch is turned ON (IG))

  • Front seat headrest assembly RH

  • Driving support ECU
C1A9B

  1. Power switch ON (IG)

  2. Headrest motor circuit has open or short circuit

  3. 1 second

  • Front seat headrest assembly RH

  • Driving support ECU
C1A9C

  1. Power switch ON (IG)

  2. Internal malfunction in active headrest ECU

  3. 1 second

  • Front seat headrest assembly RH

  • Driving support ECU

INSPECTION PROCEDURE

PROCEDURE


  1. REPLACE FRONT SEAT HEADREST ASSEMBLY RH


    1. Replace the front seat headrest assembly RH Click here.


    NEXT

  2. CHECK FOR DTC


    1. Clear DTCs Click here.

    2. Reproduce problem symptoms based on the DTC detection conditions.

    3. Check for DTCs Click here.

      OK
      DTC C1A65 is not output.

      Note

      If DTC C1A9A, C1A9B and C1A9C is output, do not replace the driving support ECU. When replacing the driving support ECU, always replace it with a new one and be sure to perform initialization Click here. If an ECU which was installed to another vehicle is used, the information stored in the ECU will not match the information from the vehicle, and as a result, a DTC may be stored.


    NG

    REPLACE DRIVING SUPPORT ECU Click here

    OK

    END