CAN COMMUNICATION SYSTEM (for LHD), Diagnostic DTC:U1125

DTC Code DTC Name
U1125 Lost Communication with Left Headrest Control ECU

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U1125 There is no communication from the active headrest control ECU LH (front seat headrest assembly LH).

  • Power source or inside of active headrest control ECU LH (front seat headrest assembly LH)

  • Active headrest control ECU LH (front seat headrest assembly LH)

WIRING DIAGRAM

A01GXWUE02

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (ACTIVE HEADREST CONTROL ECU LH - BATTERY AND BODY GROUND)


    1. A01H19HE04
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Active Headrest Control ECU LH [Front Seat Headrest Assembly LH])

      Disconnect the active headrest control ECU LH (front seat headrest assembly LH) connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      e73-3 (IG1) - Body ground Power switch on (IG) 11 to 14 V

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      e73-1 (GND) - Body ground Always Below 1 Ω
      e73-4 (LSW) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ACTIVE HEADREST CONTROL ECU LH (FRONT SEAT HEADREST ASSEMBLY LH) Click here