Toyota Venza manuals

Toyota Venza: 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.

WIRING DIAGRAM


PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

Body

Tester Display

Test Part

Control Range

Diagnostic Note

Security Horn

Security horn

ON/OFF

-

OK:

The security horn assembly sounds and stops correctly when operated through the Techstream.


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

2.

INSPECT SECURITY HORN ASSEMBLY

(a) Remove the security horn assembly (See page ).



(b) Check the operation of the security horn assembly.

OK:

Measurement Condition

Specified Condition

Battery positive (+) → Terminal 1

Horn sounds

Battery negative (-) → Horn body


NG

REPLACE SECURITY HORN ASSEMBLY


OK

3.

INSPECT SEC HORN RELAY

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


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Battery voltage applied to terminals 1 and 2

Below 1 Ω

3 - 5

Battery voltage not applied between terminals 1 and 2

10 kΩ or higher


NG

REPLACE SEC HORN RELAY


OK

4.

CHECK HARNESS AND CONNECTOR (SEC HORN RELAY POWER SOURCE)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

Engine room relay block SEC HORN relay terminal 1 - Body ground

Always

Below 1 V

Text in Illustration

*1

Engine Room Relay Block

*2

SEC HORN Relay Terminal



NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

5.

CHECK HARNESS AND CONNECTOR (SEC HORN RELAY - MAIN BODY ECU)

(a) Disconnect the D51 main body ECU (driver side junction block assembly) connector.


(b) Measure the resistance on the relay block side according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

Engine room relay block SEC HORN relay terminal 1 - D51-6 (SH)

Always

Below 1 Ω

Engine room relay block SEC HORN relay terminal 1 - Body ground

Always

10 kΩ or higher

Text in Illustration

*1

Engine Room Relay Block

*2

SEC HORN Relay Terminal

*3

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

6.

CHECK HARNESS AND CONNECTOR (SEC HORN RELAY POWER SOURCE)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

Engine room relay block SEC HORN relay terminal 3 - Body ground

Always

Below 1 V

Text in Illustration

*1

Engine Room Relay Block

*2

SEC HORN Relay Terminal



NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

7.

CHECK HARNESS AND CONNECTOR (SEC HORN RELAY - SECURITY HORN ASSEMBLY)

(a) Disconnect the A23 security horn assembly connector.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Engine room relay block SEC HORN relay terminal 5 - A23-1

Always

Below 1 Ω

Engine room relay block SEC HORN relay terminal 5 - Body ground

Always

10 kΩ or higher

Text in Illustration

*1

Engine Room Relay Block

*2

SEC HORN Relay Terminal

*3

Front view of wire harness connector

(to Security Horn Assembly)


OK

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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 h ...

Security Indicator Light Circuit
DESCRIPTION Even when the theft deterrent system is in the disarmed state, the security indicator blinks due to a signal output from the immobiliser system. The security indicator blinks continuo ...

Other materials about Toyota Venza:

Catalyst System Efficiency Below Threshold (Bank 1) (P0420)
MONITOR DESCRIPTION The ECM uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency. The first sensor, the air fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heat ...

Data Signal Circuit between Navigation Receiver Assembly and Extension Module
DESCRIPTION The stereo component tuner assembly sends the image data signal to the navigation receiver assembly via this circuit. WIRING DIAGRAM PROCEDURE 1. CHECK NAVIGATION WIRE (a) Remove the navigation wire (See pag ...

Tcm
Components COMPONENTS ILLUSTRATION Removal REMOVAL CAUTION / NOTICE / HINT NOTICE: If automatic transmission parts are replaced, refer to Parts Replacement Compensation Table to determine if any additional operations are necessary (See page ). ...

© 2016-2025 Copyright www.tovenza.com

0.1403