DTC Diagnosis Procedure

1. If DTC "C1A40-23" or "C1A40-24" is displayed with DTC "U1000-01", first diagnose the DTC "U1000-01".

Is applicable DTC detected?

YES>>

Perform diagnosis of applicable. Refer to DTC Description .

NO>>

GO TO 2.

1. 1. Turn the ignition switch OFF.
   2. Disconnect following connectors.
      • ADAS control unit
      • Steering assist switch
   3. Check for continuity between ADAS control unit harness connector and Steering assist switch harness connector.

      ADAS control unit		Steering assist switch		Continuity
      Connector	Terminal	Connector	Terminal
      M258	18	M256	1	Existed

   4. Check for continuity between ADAS control unit harness connector and ground.

      ADAS control unit		Ground	Continuity
      Connector	Terminal
      M258	18		Not existed

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair the harnesses or connectors.

1. Check for continuity between Steering assist switch harness connector and ground.

   Steering assist switch		Ground	Continuity
   Connector	Terminal
   M250	6		Existed

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair the harnesses or connectors.

1. 1. Turn the ignition switch OFF.
   2. Disconnect steering assist switch harness connector.
   3. Check warning system switch. Refer to Intermittent Incident .

Is the inspection result normal?

YES>>

Repair the ADAS control unit. Refer to Removal and Installation .

NO>>

Replace the steering assist switch. Refer to Removal and Installation .