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

This door control receiver receives signals from the transmitter and sends these signals to the main body ECU (network gateway ECU).

DTC No. DTC Detection Condition Trouble Area
B1242 In diagnostic mode, applicable RDA signal cannot be received 3 times in succession after the PRG signal is output from the main body ECU (network gateway ECU).

  • Wire harness or connector

  • Door control receiver

  • Main body ECU (network gateway ECU)

WIRING DIAGRAM

A004ITZE15
*a to Main Fuse
*b Door Control Receiver
*c Main Body ECU (Network Gateway ECU)

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


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


    1. Disconnect the D6 main body ECU (network gateway ECU) connector.

    2. Disconnect the H27 door control receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D6-6 (PRG) - H27-3 (PRG) Always Below 1 Ω
      D6-6 (PRG) or H27-3 (PRG) - Body ground Always 10 kΩ or higher
      D6-7 (RDA) - H27-2 (RDA) Always Below 1 Ω
      D6-7 (RDA) or H27-2 (RDA) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT DOOR CONTROL RECEIVER (POWER SOURCE, GROUND)


    1. A004KFME01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Door Control Receiver)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H27-5 (+B) - Body ground Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      H27-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE DOOR CONTROL RECEIVER


    1. Temporarily replace the door control receiver with a new or normally functioning one Click here.


    NEXT

  4. REGISTER RECOGNITION CODE


    1. Perform the Registration procedures Click here.

      Tech Tips

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


    NEXT

  5. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  6. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC is not output.

      Tech Tips

      Reinstall the parts, such as sensors and connectors, and restore the vehicle to its previous conditions before rechecking for DTCs.


    OK

    END (DOOR CONTROL RECEIVER IS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (NETWORK GATEWAY ECU) Click here