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 (driver side junction block assembly).

DTC No. DTC Detection Condition Trouble Area
B1242 In diagnostic mode, an applicable RDA signal cannot be received within 2.4 seconds after a PRG signal has been output from the main body ECU (driver side junction block assembly).

  • Wire harness or connector

  • Door control receiver

  • Main body ECU (Driver side junction block assembly)

WIRING DIAGRAM

A01EKNIE04

INSPECTION PROCEDURE

PROCEDURE


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


    1. A01ELJ1E03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))
      *2

      Front view of wire harness connector

      (to Door Control Receiver)

      Disconnect the D49 main body ECU (driver side junction block assembly) connector.

    2. Disconnect the M15 door control receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D49-12 (RDA) - M15-2 (RDA) Always Below 1 Ω
      D49-12 (RDA) - Body ground Always 10 kΩ or higher
      D49-10 (PRG) - M15-3 (PRG) Always Below 1 Ω
      D49-10 (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. A01EK9WE07
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Door Control Receiver)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M15-1 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      M15-5 (+B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE DOOR CONTROL RECEIVER


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


    NEXT

  4. REGISTER RECOGNITION CODE


    1. Perform the Registration procedure Click here.


    NEXT

  5. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Recheck for DTCs.

      OK
      DTC B1242 is not output.

    NG

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here

    OK

    END (DOOR CONTROL RECEIVER WAS DEFECTIVE)