Security Horn Circuit

THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: Security Horn Circuit
- Security Horn Circuit

DESCRIPTION

When the theft deterrent system is in the alarm sounding state, the main body ECU outputs a signal repeatedly at 0.4 second intervals, causing the security horn assembly to sound.

WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (SECURITY HORN)

(a) Operate the Techstream according to the steps on the display and select Active Test Theft Deterrent System.

Main Body





OK:

Security horn operates normally.

NG -- INSPECT S-HORN RELAY

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Theft Deterrent System

2. INSPECT S-HORN RELAY

(a) Remove the S-HORN relay from the engine room relay block.





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

Standard Resistance:





NG -- REPLACE S-HORN RELAY
OK -- Continue to next step.

3. INSPECT SECURITY HORN ASSEMBLY

(a) Remove the security horn Removal.

(b) Apply battery voltage to the horn connector and check the operation of the horn.

OK:





NG -- REPLACE SECURITY HORN ASSEMBLY Removal
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - MAIN BODY ECU, SECURITY HORN AND BATTERY)

(a) Remove the S-HORN relay from the engine room relay block.

(b) Remove the main body ECU Removal.

(c) Disconnect the A23 horn connector.

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

Standard Resistance:





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

Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal