WIRELESS DOOR LOCK CONTROL SYSTEM(w/o 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. This DTC is stored when the applicable RDA signal cannot be received within 1 second of the PRG signal being output from the main body ECU.

DTC Code DTC Detection Condition Trouble Area
B1242 The applicable RDA signal cannot be received within 1 second of the PRG signal being output from the main body ECU.

  • Harness or connector

  • Door control receiver

  • Main body ECU

WIRING DIAGRAM

A004ODXE02
*a from Battery
*b Door Control Receiver
*c Main Body ECU

CAUTION / NOTICE / HINT

Note


  • As the door control battery is installed between the vehicle battery and main body ECU (instrument panel junction block assembly), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (instrument panel junction block assembly) before performing this troubleshooting procedure Click here.

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

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B1242 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

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

    A004RKME02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Main Body ECU [Instrument Panel Junction Block])
    *2

    Front view of wire harness connector

    (to Door Control Receiver)

    1. Disconnect the D81 ECU connector.

    2. Disconnect the H14 receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D81-5 (RDA) - H14-2 (RDA) Always Below 1 Ω
      D81-6 (PRG) - H14-3 (PRG)
      D81-5 (RDA) or H14-2 (RDA) - Body ground Always 10 kΩ or higher
      D81-6 (PRG) or H14-3 (PRG) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - BATTERY AND BODY GROUND)

    A004TR1E02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Door Control Receiver)

    1. Disconnect the H14 receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H14-1 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      H14-5 (+B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE DOOR CONTROL RECEIVER


    1. Temporarily replace the door control receiver with a new one.


      1. for Sedan: Refer to the following procedures Click here.

      2. for Wagon: Refer to the following procedures Click here.

    2. Perform the registration procedures Click here.


    NEXT

  6. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  7. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B1242 is not output.

    OK

    END (DOOR CONTROL RECEIVER IS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)