Toyota RAV4 manuals

Toyota Sienna Service Manual: Security Horn Circuit

DESCRIPTION

During the alarm sounding state, the relay in the ECU turns on and off in a cycle of approximately 0.2 seconds, causing the security horn to sound.

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 INSPECT SECURITY HORN ASSEMBLY

INSPECT SECURITY HORN ASSEMBLY

  1. Disconnect the T1 security horn connector.
  2.  Check the operation of the security horn.

Standard

Standard

2 CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BODY ECU - SECURITY HORN ASSEMBLY)

 CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BODY ECU - SECURITY HORN ASSEMBLY)

  1. Disconnect the B8 ECU connector.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

REPLACE MULTIPLEX NETWORK BODY ECU

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