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

B004RLEE27

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.

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.

      Click here

    2. B004YNNE06

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

      Standard Resistance
      for LHD:
      Tester Connection Condition Specified Condition
      5F-16 - A-28 (HORN) Always Below 1 Ω
      Standard Resistance
      for RHD:
      Tester Connection Condition Specified Condition
      5F-28 - A-28 (HORN) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here