Diagnosis Procedure
WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
- CONFIRMATION OF DTC WHICH DETECTED
- Turn ignition switch ON.
- Erase DTC.
- Perform DTC confirmation procedure again. Refer to DTC Confirmation Procedure .
Is DTC U1266 detected with DTC U1249 and U125D?
YES
Replace display control unit. Refer to Removal and Installation .
NO
GO TO 2.
- CHECK USB HARNESS CONNECTION
- Turn ignition switch OFF.
- Visually check USB harness connector between display control unit and TCU.
Is the inspection result normal?
YES
GO TO 3.
NO
Repair or replace USB harness.
- CHECK TCU 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.