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Home >> Infiniti >> 2017 >> Q50 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 225 (Audio, Visual & Navigation System (INFINITI INTOUCH) (Diagnostic Trouble Codes (DTCS) B1F10-U1725 And Circuit Diagnosis) (Hybrid)) >> DTC / Circuit Diagnosis >> DTC U1266: TCU >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

  1. 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  .

  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.

  3. 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.

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