Dtc B1242 Wireless Door Lock Tuner Circuit Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK DOOR CONTROL RECEIVER (DOOR CONTROL RECEIVER - MAIN BODY ECU)

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

REPLACE DOOR CONTROL RECEIVER

CLEAR DTC

CHECK FOR DTC

DTC 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.

DTC Code
DTC Detection Condition
Trouble Area
B1242
The applicable RDA signal cannot be received within 1 second of the PRG signal being output from the main body ECU.
  1. Harness or connector
  2. Door control receiver
  3. Main body ECU (multiplex network body ECU)

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Door Lock.Power Door Lock Control System. Dtc B1242 Wireless Door Lock Tuner Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. When replacing the door control receiver, refer to the registration procedures (LandCruiser RM000001WYL02BX.html).
1.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000002BZF06RX.html).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000002BZF06RX.html).

    OK:
    DTC B1242 is not output.


NG
Go to step 3
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMI00MX.html)

3.CHECK DOOR CONTROL RECEIVER (DOOR CONTROL RECEIVER - MAIN BODY ECU)

  1. Disconnect the R26 receiver connector.

  1. Disconnect the G64 ECU connector.

  1. 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) - Body ground
    		Always
    		10 kΩ or higher
    R26-3 (PRG) or G64-25 (PRG) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Door Lock.Power Door Lock Control System. Dtc B1242 Wireless Door Lock Tuner Circuit Malfunction

  1. Disconnect the R26 receiver connector.

  1. Measure the resistance and voltage 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
    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    R26-5 (+B) - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Door Control Receiver)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE DOOR CONTROL RECEIVER

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

    1. for 5 Door: (LandCruiser RM0000046JL02MX.html).
    2. for 3 Door: (LandCruiser RM0000046JQ00VX.html).

  1. Perform the registration procedures (LandCruiser RM000001WYL02BX.html).


NEXT


6.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000002BZF06RX.html).


NEXT


7.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000002BZF06RX.html).

    OK:
    DTC B1242 is not output.


NG
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (LandCruiser RM000003WBO05FX.html)
OK

END (DOOR CONTROL RECEIVER IS DEFECTIVE)