LIN COMMUNICATION SYSTEM, Diagnostic DTC:B1273

DTC Code DTC Name
B1273 Sliding Roof ECU Communication Stop

DESCRIPTION

This DTC is stored when LIN communication between the sliding roof drive gear and main body ECU (instrument panel junction block assembly) stops for 10 seconds or more.

DTC Code DTC Detection Condition Trouble Area
B1273 No communication between the sliding roof drive gear and main body ECU (instrument panel junction block assembly) for 10 seconds or more.

  • Sliding roof drive gear

  • Main body ECU (instrument panel junction block assembly)

  • Harness or connector

WIRING DIAGRAM

A004NIDE98

CAUTION / NOTICE / HINT

Note


  • When using the intelligent tester with the ignition switch off to troubleshoot:

    Connect the intelligent tester to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.

  • Inspect the fuses and bulbs for circuits related to this system before performing the following inspection procedure.

Tech Tips

When the communication between the sliding roof drive gear and main body ECU (instrument panel junction block assembly) stops, DTC B2325 is also stored.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC B1273 is output A
      DTC B1273 is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SLIDING ROOF DRIVE GEAR)

    A004RIKE02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Main Body ECU)
    *2

    Front view of wire harness connector

    (to Sliding Roof Drive Gear)

    1. Disconnect the D79 ECU connector.

    2. Disconnect the K9 drive gear connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D79-23 (LIN2) - K9-4 (MPX1) Always Below 1 Ω
      D79-23 (LIN2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (SLIDING ROOF DRIVE GEAR - BATTERY AND BODY GROUND)


    1. A004OPRE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Sliding Roof Drive Gear)

      Disconnect the K9 drive gear connector.

    2. Measure the resistance and voltage according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      K9-2 (E) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      K9-1 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY


    1. Temporarily replace the sliding roof drive gear with a new or normally functioning one Click here.

    2. Clear the DTCs Click here.


    NEXT

  6. CHECK FOR DTC


    1. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC B1273 is not output A
      DTC B1273 is output B

    A

    END (SLIDING ROOF DRIVE GEAR IS DEFECTIVE)

    B

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)