THEFT DETERRENT SYSTEM (w/o Smart Entry and Start System) Security Horn Circuit

DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU controls the security horn.

WIRING DIAGRAM

A017DQAE04

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ENGINE ROOM JUNCTION BLOCK)


    1. A017DR8E02

      Disconnect the D9 ECU connector.

    2. Connect a negative battery lead to terminal 6 (SH) of the D9 ECU connector.

    3. Check operation of the security horn.

      OK
      Measurement Condition Specified Condition
      Battery negative (-) → D9-6 (SH) Horn sounds

    NG

    INSPECT SECURITY HORN ASSEMBLY Click here

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. INSPECT SECURITY HORN ASSEMBLY


    1. A017C70

      Remove the security horn assembly Click here.

    2. Connect a positive battery lead to terminal 1 of the security horn assembly, and a negative battery lead to the horn body.

    3. Check operation of the horn.

      OK
      Measurement Condition Specified Condition
      Battery positive (+) → Terminal 1 Horn sounds
      Battery negative (-) → Horn body

    NG

    REPLACE SECURITY HORN ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK - SECURITY HORN ASSEMBLY)


    1. A017G55E03

      Disconnect the 2A engine room junction block connector and A16 security horn assembly connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      2A-5 - A16-1 Always Below 1 Ω
      2A-5 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (BATTERY - ENGINE ROOM JUNCTION BLOCK)


    1. A017F0RE03

      Disconnect the 2G engine room junction block assembly connector.

    2. Measure the voltage on the junction block side according to the value(s) in the table below.

      Standard voltage
      Tester Connection Condition Specified Condition
      2G-1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK - MAIN BODY ECU)


    1. Disconnect the 2D engine room junction block connector.

    2. Disconnect the D9 ECU connector.

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

      A017F9ZE02
      Standard resistance
      Tester Connection Condition Specified Condition
      2D-11 - D9-6 (SH) Always Below 1 Ω
      D9-6 (SH) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ENGINE ROOM JUNCTION BLOCK