THEFT DETERRENT SYSTEM Horn Circuit

DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the horn to sound at intervals of 0.4 seconds.

WIRING DIAGRAM

A01HEU5E04

CAUTION / NOTICE / HINT

Note


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

  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*

    *: w/ Door Control Battery

    Click here

PROCEDURE


  1. CHECK HORNS OPERATION


    1. Press the horn switch and check if the horns sound.

      Result
      Proceed to
      Horns sound
      Horns do not sound

    Horns do not sound

    GO TO HORN SYSTEM Click here

    Horns sound

  2. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

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

      A01HIBWN02
      *1 HORN
      Standard Resistance
      Tester Connection Condition Specified Condition
      4B-49 - A-28 (HORN) Always Below 1 Ω
      Result
      Proceed to
      OK (for LHD)
      OK (for RHD)
      NG (for LHD)
      NG (for RHD)

    OK (for LHD)

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK (for RHD)

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG (for LHD)

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    NG (for RHD)

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here