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

A01X1ICE05
*a MPX-B NO.1
*b from Battery
*c Main Body ECU
*d Door Control Receiver

CAUTION / NOTICE / HINT

Note


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

  • When replacing the door control receiver, refer to the registration procedures Click here.

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 DOOR CONTROL RECEIVER (DOOR CONTROL RECEIVER - MAIN BODY ECU)


    1. Disconnect the L47 receiver connector.

    2. Disconnect the E118 main body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L47-2 (RDA) - E118-4 (RDA) Always Below 1 Ω
      L47-3 (PRG) - E118-5 (PRG) Always Below 1 Ω
      L47-2 (RDA) - Body ground Always 10 kΩ or higher
      L47-3 (PRG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01X5DOE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Door Control Receiver)

      Disconnect the L47 receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L47-1 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L47-5 (+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 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.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    END (DOOR CONTROL RECEIVER IS DEFECTIVE)

    B

    REPLACE MAIN BODY ECU Click here

    C

    REPLACE MAIN BODY ECU Click here