DTC    B1242    Wireless Door Lock Tuner Circuit Malfunction

for Preparation Click here


DESCRIPTION

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

DTC No.
DTC Detection Condition
Trouble Area
B1242
In diagnostic mode, applicable RDA signal cannot be received within 1 second of PRG signal being output from main body ECU.
  1. Wire harness or connector
  2. Door control receiver
  3. Main body ECU

WIRING DIAGRAM


B211403E01


INSPECTION PROCEDURE

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

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


    B211404E01

  1. Disconnect the D42 main body ECU connector.

  1. Disconnect the G31 door control receiver connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D42-26 (RDA) - G31-2 (RDA)
    		Always
    		Below 1 Ω
    D42-26 (RDA) or G31-2 (RDA) - Body ground
    		Always
    		10 kΩ or higher
    D42-25 (PRG) - G31-3 (PRG)
    		Always
    		Below 1 Ω
    D42-25 (PRG) or G31-3 (PRG) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Door Control Receiver)
    *2
    		Front view of wire harness connector
    (to Main Body ECU)

  1. Reconnect the main body ECU connector.

  1. Reconnect the door control receiver connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT DOOR CONTROL RECEIVER (POWER SOURCE, GROUND)
B177993E07

  1. Disconnect the G31 door control receiver connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G31-5 (+B) - Body ground
    		Always
    		11 to 14 V

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G31-1 (GND) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Door Control Receiver)

  1. Reconnect the door control receiver connector.



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).

    HINT:
    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.

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



NG
REPLACE MAIN BODY ECU (Click here)
OK

END (DOOR CONTROL RECEIVER IS DEFECTIVE)