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 (multiplex network body ECU).

DTC Code DTC Detection Condition Trouble Area Note
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 (multiplex network body ECU)

 for 5L-E

WIRING DIAGRAM

B001CY8E01
*a from Battery
*b Door Control Receiver
*c Main Body ECU (Multiplex Network Body ECU)

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following 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 HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the R26 door control receiver connector.

    2. Disconnect the G64 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R26-2 (RDA) - G64-26 (RDA) Always Below 1 Ω
      R26-3 (PRG) - G64-25 (PRG)
      R26-2 (RDA) or G64-26 (RDA) - Other terminals and body ground Always 10 kΩ or higher
      R26-3 (PRG) or G64-25 (PRG) - Other terminals and body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. B001G2YC01
      *a

      Front view of wire harness connector

      (to Door Control Receiver)

      Disconnect the door control receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R26-1 (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
      R26-5 (+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.

    OK

    END (DOOR CONTROL RECEIVER IS DEFECTIVE)

    NG

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