PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A66, C1A9D, C1A9E, C1A9F

DTC Code DTC Name
C1A66 Left Active Headrest System
C1A9D Front Capacitive Sensor LH
C1A9E Open in Front Motor Line LH Circuit
C1A9F Front Headrest Control ECU LH Writing Error

DESCRIPTION

When the active headrest ECU detects an internal malfunction in the headrest, DTC C1A9D, C1A9E and C1A9F are stored.

When the driving support ECU receives a signal indicating a malfunction from the active headrest ECU, DTC C1A66 is stored.

DTC Code DTC Detection Condition Trouble Area
C1A66

  1. Power switch ON (IG)

  2. Signal indicating malfunction received from active headrest ECU

  3. 2 seconds

  • Front seat headrest assembly LH

  • Driving support ECU
C1A9D

  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 LH

  • Driving support ECU
C1A9E

  1. Power switch ON (IG)

  2. Headrest motor circuit has open or short circuit

  3. 1 second

  • Front seat headrest assembly LH

  • Driving support ECU
C1A9F

  1. Power switch ON (IG)

  2. Internal malfunction in active headrest ECU

  3. 1 second

  • Front seat headrest assembly LH

  • Driving support ECU

PROCEDURE


  1. REPLACE FRONT SEAT HEADREST ASSEMBLY LH


    1. Replace the front seat headrest assembly LH 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 C1A66 is not output.

      Note

      If DTC C1A9D, C1A9E and C1A9F 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.


    OK

    END

    NG

    REPLACE DRIVING SUPPORT ECU Click here