Diagnosis Procedure

CONFIRMATION OF DTC WHICH DETECTED
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC confirmation procedure again. Refer to DTC DESCRIPTION .
Is DTC U1266 detected with DTC U1249 and U125D?

YES

Replace display control unit. Refer to REMOVAL AND INSTALLATION .

NO

GO TO STEP 2 .

CHECK USB HARNESS CONNECTION
1. Turn ignition switch OFF.
2. Visually check USB harness connector between display control unit and TCU.
Is the inspection result normal?

YES

GO TO STEP 3 .

NO

Repair or replace USB harness.

CHECK TCU UNIT POWER SUPPLY AND GROUND CIRCUIT

Check TCU power supply and ground circuit. Refer to DIAGNOSIS PROCEDURE .

Is the inspection result normal?

YES

Replace TCU. Refer to REMOVAL AND INSTALLATION .

NO

Repair or replace malfunctioning parts.