Security Horn Circuit

THEFT DETERRENT: THEFT DETERRENT SYSTEM: Security Horn Circuit
- Security Horn Circuit

DESCRIPTION

* When the theft deterrent system is operating, the main body ECU outputs a signal continuously at 0.4 second intervals, causing the security horn to sound.

WIRING DIAGRAM





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".

Main Body





OK:

Security horn operates normally.

NG -- INSPECT FUSE (MET-B)

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Theft Deterrent System

2. INSPECT FUSE (MET-B)

(a) Remove the MET-B fuse from the engine room relay block unit B.

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

Standard resistance:





NG -- REPLACE FUSE
OK -- Continue to next step.

3. INSPECT SECURITY HORN RELAY





(a) Remove the SECURITY 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 SECURITY HORN RELAY
OK -- Continue to next step.

4. INSPECT SECURITY HORN ASSEMBLY

(a) Remove the security horn Removal.





(b) Check operation of the horn.

OK:





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

5. CHECK HARNESS AND CONNECTOR (SECURITY HORN RELAY - BATTERY)

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





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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (SECURITY HORN RELAY - SECURITY HORN)

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





(b) Disconnect the A28 security horn connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SECURITY HORN RELAY)

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





(b) Disconnect the J1 main body ECU connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU