Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJHH
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM(w/o Smart Key System): B1242; Wireless Door Lock Tuner Circuit Malfunction; 2016 - 2020 MY Sienna [12/2015 -        ]

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.

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.
  • Wire harness or connector
  • Door control receiver
  • Main body ECU

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

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

(a) Disconnect the D13 main body ECU connector and the L26 door control receiver connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D13-26 (RDA) - L26-2 (RDA)

Always

Below 1 Ω

D13-26 (RDA) - Body ground

Always

10 kΩ or higher

D13-25 (PRG) - L26-3 (PRG)

Always

Below 1 Ω

D13-25 (PRG) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

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

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

Standard:

Tester Connection

Condition

Specified Condition

L26-1 (GND) - Body ground

Always

Below 1 Ω

L26-5 (+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

3.

REPLACE DOOR CONTROL RECEIVER

(a) Temporarily replace the door control receiver with a new or known good one (See page 2016 - 2020 MY Sienna [12/2015 -        ]; DOOR LOCK: DOOR CONTROL RECEIVER: REMOVAL ).

NEXT

4.

REGISTER RECOGNITION CODE

(a) Perform the Registration procedure (See page 2016 - 2020 MY Sienna [12/2015 -        ]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM(w/o Smart Key System): REGISTRATION ).

NEXT

5.

CONFIRM DTC

(a) Clear the DTCs (See page 2016 - 2020 MY Sienna [12/2015 -        ]; DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM(w/o Smart Key System): DTC CHECK / CLEAR ).

(b) Recheck for DTCs.

Result

Result

Proceed to

DTC is not output

A

DTC is output

B
A

END (DOOR CONTROL RECEIVER WAS DEFECTIVE)
B

REPLACE MAIN BODY ECU