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 ECU (sliding roof drive gear sub-assembly) and main body ECU (driver side junction block assembly) stops for more than 10 seconds.

DTC No. DTC Detection Condition Trouble Area
B1273 No communication between the sliding roof ECU (sliding roof drive gear sub-assembly) and main body ECU (driver side junction block assembly) for more than 10 seconds.

  • Sliding roof ECU (Sliding roof drive gear sub-assembly)

  • Main body ECU (Driver side junction block assembly)

  • Wire harness or connector

  • S/ROOF fuse

WIRING DIAGRAM

A01EJFAE81

INSPECTION PROCEDURE

Note


  • When the sliding roof ECU (sliding roof drive gear sub-assembly) is replaced or removed and reinstalled, it requires initialization Click here.

  • When using the GTS to troubleshoot with the ignition switch off:

    Connect the GTS to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the GTS and vehicle begins.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU - BATTERY AND BODY GROUND)


    1. A01EMS0E21
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Sliding Roof ECU (Sliding Roof Drive Gear Sub-assembly))

      Disconnect the P4 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P4-2 (E) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      P4-1 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SLIDING ROOF ECU)


    1. A01EKKYE09
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))
      *2

      Front view of wire harness connector

      (to Sliding Roof ECU (Sliding Roof Drive Gear Sub-assembly))

      Disconnect the D48 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D48-10 (LIN2) - P4-4 (LIN) Always Below 1 Ω
      P4-4 (LIN) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)


    1. Replace the sliding roof ECU (sliding roof drive gear sub-assembly) Click here.


    NEXT

  4. CHECK DTC OUTPUT


    1. Clear the DTC Click here.

    2. Recheck for DTCs.

      OK
      DTC B1273 is not output.

    NG

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here

    OK

    END (SLIDING ROOF ECU WAS DEFECTIVE)