Toyota RAV4 manuals

Toyota Sienna Service Manual: Wireless Door Lock Tuner Circuit Malfunction

DTC B1242 Wireless Door Lock Tuner Circuit Malfunction

DESCRIPTION

When a RDA signal is not input to the door control receiver within 1 second after the multiplex network body ECU outputs a PRG signal, this DTC is set.

DTC No.

DTC Detection Condition

Suspected Area

B1242

Within 1 second after PRG signal is output from multiplex network body ECU during self-diagnostic mode, corresponding RDA signal is not input
  • Wire harness
  • Door control receiver
  • Multiplex network body ECU

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

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

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

  1. Disconnect the D4 receiver connector.
  2.  Disconnect the B9 ECU connector.
  3.  Check the resistance between the wire harness side connectors.

Standard resistance

Standard resistance

  1. Check the voltage and resistance between the D4 receiver connector or B9 ECU connector and the body ground.

Standard

Standard

2 CHECK DOOR CONTROL RECEIVER

  1. Check that the DTC is not output.

REPLACE MULTIPLEX NETWORK BODY ECU

Diagnostic trouble code chart
HINT:  If a trouble code is displayed during the DTC check, inspect the circuit listed for that code. For details of the code, refer to the "See page" in the DTC chart.   ...

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Other materials:

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Installation
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Reassembly
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