Toyota Venza: Wireless Door Lock Tuner Circuit Malfunction (B1242)

Toyota Venza Service Manual / Door Lock / Wireless Door Lock Control System(w/o Smart Key System) / Wireless Door Lock Tuner Circuit Malfunction (B1242)

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

PROCEDURE

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

(a) Disconnect the D49 main body ECU connector and the M15 door control receiver connector.

(b) 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

Text in Illustration

Front view of wire harness connector

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

Front view of wire harness connector

(to Door Control Receiver)

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (BATTERY, BODY GROUND)

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

Standard:

Tester Connection	Condition	Specified Condition
M15-1 (GND) - Body ground	Always	Below 1 Ω
M15-5 (+B) - Body ground	Always	11 to 14 V

Text in Illustration

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	REPLACE DOOR CONTROL RECEIVER

(a) Temporarily replace the door lock control receiver with a new or known good one (See page ).

4.	REGISTER RECOGNITION CODE

(a) Perform the Registration procedure (See page ).

5.	CONFIRM DTC

(a) Clear the DTCs (See page ).

(b) Recheck for DTCs.

Result	Proceed to
DTC is not output	A
DTC is output	B

END (DOOR CONTROL RECEIVER WAS DEFECTIVE)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

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DESCRIPTION The door control receiver receives signals from the transmitter and sends these signals to the main body ECU. The main body ECU then controls all doors by sending lock/unlock signals ...

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