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 No.

Detection Item

DTC Detection Condition

Trouble Area

B1273

Sliding Roof ECU Communication Stop

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

C217632E15

CAUTION / NOTICE / HINT

Note:

  • When using the intelligent tester with the engine 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 for circuits related to this system before performing the following inspection procedure.

  • When the sliding roof drive gear sub-assembly is removed and reinstalled or replaced, the sliding roof drive gear sub-assembly must be initialized (Click here).

Tip:

When DTC B1273 and B2325 are output simultaneously, perform troubleshooting for DTC B2325 first (Click here).

PROCEDURE

  1. CLEAR DTC

    1. Clear the DTCs

      Click here

      Body Electrical > Main Body > Clear DTCs

    Result

    Result

    NEXT
    NEXT

  2. CHECK FOR DTC

    1. Check for DTCs

      Click here

      Body Electrical > Main Body > Trouble Codes

      OK

      DTC B1273 is not output.

    Result

    Result

    OK

    NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click here

    NG

  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 hereClick 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

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    C216964C01

    *a

    Front view of wire harness connector (to Sliding Roof Drive Gear Sub-assembly)

    1. 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

      Condition

      Specified Condition

      W2-1 (B) - Body ground

      Always

      11 to 14 V

      W2-5 (IG) - Body ground

      Engine switch on (IG)Always

      11 to 14 V

    Result

    Result

    OK

    NG
    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

    Result

    Result

    NEXT
    NEXT

  6. CLEAR DTC

    1. Clear the DTCs

      Click here

      Body Electrical > Main Body > Clear DTCs

    Result

    Result

    NEXT
    NEXT

  7. CHECK FOR DTC

    1. Check for DTCs

      Click here

      Body Electrical > Main Body > Trouble Codes

      OK

      DTC B1273 is not output.

    Result

    Result

    OK

    NG
    OK

    END (SLIDING ROOF DRIVE GEAR IS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click hereClick here