DTC    B1242/42    Wireless Door Lock Tuner Circuit Malfunction

for Preparation Click here


DESCRIPTION

This door control receiver receivers signals from the transmitter and sends these signals to the multiplex network body ECU.

DTC No.
DTC Detection Condition
Suspected Area
B1242/42
In the diagnostic mode, the applicable RDA signal cannot be received within 1 second after PRG signal has been output from the body ECU.
  1. Wire harness
  2. Door control receiver
  3. Instrument panel J/B (Multiplex network body ECU)

WIRING DIAGRAM


B112261E01


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BODY ECU TO DOOR CONTROL RECEIVER)


    B110073E05

  1. Disconnect the multiplex network body ECU (B5) connector and door control receiver connector.

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

    Standard resistance:
    Tester connection
    		Condition
    		Specified condition
    B5-11 (PRG) - D3-3 (PRG)
    		Always
    		Below 1 Ω
    B5-11 (PRG) - Body ground
    		Always
    		10 kΩ or higher
    B5-12 (RDA) - D3-2 (RDA)
    		Always
    		Below 1 Ω
    B5-12 (RDA) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT DOOR CONTROL RECEIVER (+B TERMINAL)


    B110074E08

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

    Standard voltage:
    Tester connection
    		Condition
    		Specified condition
    D3-5 (+B) - Body ground
    		Always
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (+B CIRCUIT)
OK


3.INSPECT DOOR CONTROL RECEIVER (E TERMINAL)


    B110074E05

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

    Standard resistance:
    Tester connection
    		Condition
    		Specified condition
    D3-1 (E) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (E CIRCUIT)
OK


4.REPLACE DOOR CONTROL RECEIVER

  1. Reconnect the multiplex network body ECU connector.

  1. Replace the door control receiver (Click here).

  1. Perform the REGISTRATION procedures (Click here).

    HINT:
    If there is a new door control receiver or one functioning normally 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.RECHECK DTC

  1. Clear the DTC (Click here).

  1. Check if the same DTC is detected (Click here).

    HINT:
    Reinstall the sensors, connector, etc. and restore the vehicle to its previous condition before rechecking for DTCs.


Result:

Condition
Proceed to
DTC (B1242/42) is output
A
DTC (B1242/42) is not output
B



B
END
A

REPLACE INSTRUMENT PANEL JUNCTION BLOCK