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

  • Instrument panel junction block assembly

WIRING DIAGRAM

B309040E11

CAUTION / NOTICE / HINT

Note:

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

    Connect the GTS to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS 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

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

Tip:

When the 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

      Body Electrical > Main Body > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  2. CHECK FOR DTC

    1. Check for DTCs.

      Click here

      Body Electrical > Main Body > Trouble Codes

    Result

    Proceed to

    DTC B1273 is output

    DTC B1273 is not output
    DTC B1273 is not output

    USE SIMULATION METHOD TO CHECK

    DTC B1273 is output

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      for LHD:

      Click here

      for RHD:

      Click here

    2. Disconnect the Q8 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) - Q8-11 (MPX1)

      Always

      Below 1 Ω

      A-16 (LIN2) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)Click here

    OK

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

    1. B295816C06

      *a

      Front view of wire harness connector

      (to Sliding Roof Drive Gear Sub-assembly)

      Disconnect the Q8 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

      Q8-12 (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

      Q8-8 (B) - Body ground

      Power switch off

      11 to 14 V

    Result

    Proceed to

    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

    2. Clear the DTCs.

      Click here

      Body Electrical > Main Body > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  6. CHECK FOR DTC

    1. Check for DTCs.

      Click here

    Result

    Proceed to

    DTC B1273 is not output

    DTC B1273 is output (for LHD)

    DTC B1273 is output (for RHD)
    DTC B1273 is not output

    END (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY IS DEFECTIVE)

    DTC B1273 is output (for LHD)

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click here

    DTC B1273 is output (for RHD)

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click here

  7. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

    1. Disconnect the 3D instrument panel junction block assembly connector.

    2. Disconnect the Q8 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

      3D-54 - Q8-11 (MPX1)

      Always

      Below 1 Ω

      3D-54 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK (for LHD)

    OK (for RHD)

    NG
    OK (for LHD)

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    Click here

    OK (for RHD)

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR