WIRELESS DOOR LOCK CONTROL SYSTEM (w/o Smart Entry and Start System), Diagnostic DTC:B1242

DTC Code DTC Name
B1242 Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

The door control receiver receives signals from the transmitter and sends these signals to the main body ECU.

DTC No. DTC Detection Condition Trouble Area
B1242 In diagnostic mode, an applicable RDA signal cannot be received within 1 second after a PRG signal has been output from the main body ECU.

  • Wire harness or connector

  • Door control receiver

  • Main body ECU

WIRING DIAGRAM

A017D44E03

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DOOR CONTROL RECEIVER)


    1. for LHD:


      1. Disconnect the D6 main body ECU connector and the O28 door control receiver connector.

        A017CCME02

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

        Standard resistance
        Tester Connection Condition Specified Condition
        D6-12 (RDA) - O28-2 (RDA) Always Below 1 Ω
        D6-12 (RDA) - Body ground Always 10 kΩ or higher
        D6-10 (PRG) - O28-3 (PRG) Always Below 1 Ω
        D6-10 (PRG) - Body ground Always 10 kΩ or higher

    2. for RHD:


      1. Disconnect the D6 main body ECU connector and the O38 door control receiver connector.

        A017EMXE01

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

        Standard resistance
        Tester Connection Condition Specified Condition
        D6-12 (RDA) - O38-2 (RDA) Always Below 1 Ω
        D6-12 (RDA) - Body ground Always 10 kΩ or higher
        D6-10 (PRG) - O38-3 (PRG) Always Below 1 Ω
        D6-10 (PRG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (BATTERY, BODY GROUND)


    1. for LHD:


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

        A017D0QE01
        Standard
        Tester Connection Condition Specified Condition
        O28-1 (GND) - Body ground Always Below 1 Ω
        O28-5 (+B) - Body ground Always 11 to 14 V

    2. for RHD:


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

        A017FPBE01
        Standard
        Tester Connection Condition Specified Condition
        O38-1 (GND) - Body ground Always Below 1 Ω
        O38-5 (+B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE DOOR CONTROL RECEIVER


    1. Reconnect the D6 main body ECU connector.

    2. Replace the door control receiver with a normal one Click here.

    3. Perform the registration procedures Click here.

      Tech Tips

      If a normally functioning door control receiver is available, connect it and check if the wireless door lock function is normal or DTCs are output. If the alternative receiver functions normally, replace the original door control receiver.


    NEXT

  4. CONFIRM DTC


    1. Clear the DTCs Click here.

    2. Check if the same DTC is detected.

      Tech Tips

      Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)