MULTIPLEX COMMUNICATION SYSTEM, Diagnostic DTC:B1209

DTC Code DTC Name
B1209 Driver Side Outer Mirror

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
B1209 Outer mirror control ECU (driver side) Communication stops

  • Outer mirror control ECU (driver side)

  • Wire harness or connector

WIRING DIAGRAM

A0163IME12

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" DTC B1209, repair the "+B or GND short malfunction of communication bus" DTCs first Click here.

PROCEDURE


  1. INSPECT FUSE (FR DOOR LH*1, FR DOOR RH*2, MPX-B)


    1. Remove the FR DOOR LH fuse from the main body ECU LH (cowl side junction block LH)*1.

    2. Remove the FR DOOR RH fuse from the main body ECU RH (cowl side junction block RH)*2.

    3. Remove the MPX-B fuse from the engine room relay block No. 1.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      FR DOOR LH fuse*1 Always Below 1 Ω
      FR DOOR RH fuse*2 Always Below 1 Ω
      MPX-B fuse Always Below 1 Ω

      • *1: for LHD

      • *2: for RHD


    NG

    REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU - BATTERY AND BODY GROUND)


    1. A015YO3E07

      Disconnect the M10 ECU connector*1.

    2. Disconnect the L10 ECU connector*2.

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

      Standard Voltage
      Tester Connection Condition Specified Condition

      M10-6 (BDR)*1 - Body ground

      L10-6 (BDR)*2 - Body ground

      		 Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition

      M10-1 (GND)*1 - Body ground

      L10-1 (GND)*2 - Body ground

      		 Always Below 1 Ω

      • *1: for LHD

      • *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (OUTER MIRROR CONTROL ECU - BATTERY AND BODY GROUND)

    OK

  3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)


    1. Disconnect the M10 and J55 ECU connectors*1.

      A0162JDE10

    2. Disconnect the L10 and P33 ECU connectors*2.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      M10-8 (MPX1) - J55-24 (MPX2)*1

      L10-8 (MPX1) - P33-27 (MPX1)*2

      		 Always Below 1 Ω

      M10-8 (MPX1)*1 - Body ground

      L10-8 (MPX1)*2 - Body ground

      		 Always 10 kΩ or higher

      • *1: for LHD

      • *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COMMUNICATION LINE)

    OK

    REPLACE OUTER MIRROR CONTROL ECU (DRIVER SIDE) Click here