Toyota Venza: Horn Circuit

Toyota Venza Service Manual / Theft Deterrent / Keyless Entry / Theft Deterrent System(w/o Smart Key System) / Horn Circuit

DESCRIPTION

When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (driver side junction block assembly) transmits a signal to cause the horn to sound at intervals of 0.4 seconds.

WIRING DIAGRAM

PROCEDURE

1.	INSPECT HORNS

(a) Press the horn switch and check if the horns sound.

Result	Proceed to
Horns sound	A
Horns do not sound	B

GO TO HORN SYSTEM

2.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Select the item below in the Active Test and then check that the horns operate.

Main Body

Tester Display	Test Part	Control Range	Diagnostic Note
Vehicle Horn	Vehicle horns	ON / OFF	-

OK:

The vehicle horns sound and stop correctly when operated through the Techstream.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

Engine Hood Courtesy Switch Circuit

DESCRIPTION The security courtesy switch is installed together with the hood lock. This switch turns off when the engine hood is opened and turns on when the engine hood is closed. WIRING DIAGRAM ...

Security Horn Circuit

DESCRIPTION When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (driver side junction block assembly) controls the security horn. WIRI ...

Other materials about Toyota Venza:

Electrical Key Oscillator(for Rear Side)
Components COMPONENTS ILLUSTRATION Removal REMOVAL PROCEDURE 1. REMOVE REAR BUMPER PLATE LH 2. REMOVE REAR BUMPER PLATE RH 3. REMOVE REAR BUMPER ASSEMBLY 4. REMOVE ELECTRICAL KEY ANTENNA (a) Disconnect the connector. ...

How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use the following procedures to troubleshoot the tire pressure warning system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT ...

Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE BREATHER PLUG HOSE (a) Using a screwdriver, remove the No. 2 breather plug (ATM) from the transaxle case sub-assembly. (b) Using a screwdriver, remove ...