Horn Circuit

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

DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the multiplex network body ECU transmits a signal to cause the horn to sound at intervals of 0.4 seconds.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect Techstream (with CAN VIM) to the DLC3.

(b) Turn the ignition switch on (IG).

(c) Press Techstream main switch on.

(d) Select the item below in the Active Test and then check that the indicator operates.

Body No. 5:





OK:

The horn sounds or stops correctly when operating it through Techstream.

NG -- INSPECT FUSE (HORN)

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

2. INSPECT FUSE (HORN)

(a) Remove the HORN fuse from the engine room R/B and J/B.

(b) Check the resistance.

Standard resistance:

Below 1 Ohms

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

3. CHECK WIRE HARNESS (ENGINE ROOM J/B - BATTERY)

(a) Disconnect 1F J/B connector.





(b) Measure the voltage of the wire harness side connector.





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

4. INSPECT HORN ASSEMBLY

(a) Low pitched horn:

(1) Apply battery voltage and check operation of the low pitched horn.





OK:





(b) High pitched horn:

(1) Apply battery voltage and check operation of the high pitched horn.





OK:





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

5. CHECK WIRE HARNESS (ENGINE ROOM J/B - HORN ASSEMBLY)

(a) Disconnect 1C J/B connector.





(b) Disconnect A9 or A10 horn connector.

(c) Check the resistance between the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY