REMOTE ENGINE STARTER SYSTEM, Diagnostic DTC:B126A

DTC Code DTC Name
B126A Remote Engine Starter ECU Communication Stop

DESCRIPTION

This DTC is stored when BERKES communication between the remote engine starter ECU and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC No. DTC Detection Condition Trouble Area
B126A No communication between remote engine starter ECU and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Remote engine starter ECU

  • Wire harness or connector

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

A011QLTE02

INSPECTION PROCEDURE

Note

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • Before replacing the remote engine starter ECU, refer to Registration Click here.

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (REMOTE ENGINE STARTER ECU - BATTERY AND BODY GROUND)

    1. Disconnect the I141 remote engine starter ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I141-10 (R+B) - Body ground Always 11 to 14 V
      I141-1 (RSIG) - Body ground Engine switch on (IG) 11 to 14 V
      I141-1 (RSIG) - Body ground Engine switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      I141-19 (RGN1) - Body ground Always Below 1 Ω
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - REMOTE ENGINE STARTER ECU)

    1. Disconnect the I13 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I13-25 (BTX) - I141-4 (BTX) Always Below 1 Ω
      I13-26 (BRX) - I141-3 (BRX) Always Below 1 Ω
      I13-25 (BTX) - Body ground Always 10 kΩ or higher
      I13-26 (BRX) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE REMOTE ENGINE STARTER ECU

    1. Temporarily replace the remote engine starter ECU with a new one Click here.

    NEXT

  4. REGISTER REMOTE ENGINE STARTER ID

    1. Register the remote engine starter ID Click here.

    NEXT

  5. CHECK DTC OUTPUT

    1. Clear the DTC Click here.

    2. Perform the remote engine start operation.

    3. Check for DTCs.

      OK
      DTC B126A is not output.
    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

    END (REMOTE ENGINE STARTER ECU WAS DEFECTIVE)