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 sub-assembly and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC Code DTC Detection Condition Trouble Area
B1273 No communication between the sliding roof drive gear sub-assembly and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Sliding roof drive gear sub-assembly

  • Main body ECU (multiplex network body ECU)

  • Harness or connector

WIRING DIAGRAM

A01DLY8E09

INSPECTION PROCEDURE

Note


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

    Connect the intelligent tester to the vehicle and turn a courtesy light 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 communication between the sliding roof drive gear sub-assembly and main body ECU (multiplex network body ECU) stops, DTC B2325 is also stored.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B1273 is not output.

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SLIDING ROOF DRIVE GEAR) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

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


    1. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly Click here.

    2. Disconnect the W2 sliding roof drive gear sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-16 (LIN2) - W2-4 (MPX1) Always Below 1 Ω
      A-16 (LIN2) or W2-4 (MPX1) - 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. A01DPO9E04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Sliding Roof Drive Gear Sub-assembly)

      Disconnect the W2 sliding roof drive gear sub-assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      W2-2 (E) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      W2-1 (B) - Body ground Always 11 to 14 V
      W2-5 (IG) - Body ground Ignition switch ON 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 sub-assembly with a new or normally functioning one Click here.


    NEXT

  6. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  7. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B1273 is not output.

    NG

    REPLACE MAIN BODY ECU Click here

    OK

    END (SLIDING ROOF DRIVE GEAR IS DEFECTIVE)