Security Horn Circuit

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

DESCRIPTION

When the theft deterrent system is operating, the certification ECU (smart key ECU assembly) 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".

Smart Key





OK:

Security horn operates normally.

NG -- INSPECT FUSE (SECURITY)

OK -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

2. INSPECT FUSE (SECURITY)

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

(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 RELAY
OK -- Continue to next step.

4. INSPECT SECURITY HORN ASSEMBLY

(a) Remove the security horn Removal.





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

OK:





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

5. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] AND SECURITY HORN)





(a) Remove the security horn relay from the engine room relay block.

(b) Disconnect the E30 ECU connector.

(c) Disconnect the A19 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 CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal