MULTIPLEX COMMUNICATION SYSTEM, Diagnostic DTC:B1273

DTC Code DTC Name
B1273 Sliding Roof ECU Communication Stop

DESCRIPTION

This DTC is detected if communication between the sliding roof control ECU and gateway ECU stops for more than 10 seconds.

DTC No. DTC Detection Condition Trouble Area
B1273 Sliding roof control ECU communication stops

  • Sliding roof control ECU

  • Wire harness or connector

WIRING DIAGRAM

A015ZOBE02

INSPECTION PROCEDURE

Tech Tips

If "+B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTCB1273, repair the "+B or GND short malfunction of communication bus" DTCs first Click here.

PROCEDURE


  1. INSPECT FUSE (S/ROOF)


    1. Remove the S/ROOF fuse from the main body ECU LH (cowl side junction block LH).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S/ROOF fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

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


    1. A015ZEHE07

      Disconnect the R6 ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      R6-5 (B) - Body ground Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      R6-7 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SLIDING ROOF CONTROL ECU - BATTERY AND BODY GROUND)

    OK

  3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)


    1. A016106E07

      Disconnect the R6 and R5 connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R6-10 (MPX1) - R5-38 (MPX2) Always Below 1 Ω
      R6-10 (MPX1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COMMUNICATION)

    OK

    REPLACE SLIDING ROOF CONTROL ECU Click here