DTC U0121[00] (Flash Code 34) Lost Communication With Anti-Lock Brake System (ABS) Control Module (Headlight Automatic Leveling Control)

1. DTC U0121[00] description

The headlight auto leveling control unit communicates the control information with the EHCU via the CAN communication circuit. If the headlight auto leveling control unit cannot receive the control information from the EHCU, the DTC is set.

2. Condition for setting DTC U0121[00]

Condition for running the DTC

  • The ignition switch is ON.

Condition for setting the DTC

  • The headlight auto leveling control unit detects that the control information cannot be received from the EHCU for 2 seconds or more.

3. Action taken when DTC U0121[00] sets

  • The headlight leveling actuator drive is stopped.
  • The headlight automatic leveling warning light illuminates.
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