Toyota Venza: Security Indicator Light Circuit

Toyota Venza Service Manual / Theft Deterrent / Keyless Entry / Theft Deterrent System(w/o Smart Key System) / 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 continuously due to a continuous signal received from the immobiliser system while in the armed state.

The main body ECU (driver side junction block assembly) causes the security indicator to come on only during the arming preparation and alarm sounding states.

WIRING DIAGRAM

PROCEDURE

1.	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 indicator operates.

Main Body

Tester Display	Test Part	Control Range	Diagnostic Note
Security Indicator	Security indicator	ON / OFF	-

OK:

The security indicator light flashes and goes off correctly when operated through the Techstream.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY - MAIN BODY ECU)

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

(b) Disconnect the F2 accessory meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D51-4 (IND) - F2-2 (SEC)	Always	Below 1 Ω
D51-4 (IND) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

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

Front view of wire harness connector

(to Accessory Meter Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY - BODY GROUND)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F2-12 (E) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Accessory Meter Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT ACCESSORY METER ASSEMBLY (SECURITY INDICATOR LIGHT)

(a) Reconnect the F2 accessory meter assembly connector with the D51 ECU connector still disconnected.

(b) Apply battery voltage from the wire harness back side between the specified terminals of the indicator, and check the lighting condition of the security indicator.

OK :

Measurement Condition	Specified Condition
Battery positive (+) → Terminal F2-2 (SEC) Battery negative (-) → Terminal F2-12 (E)	Security indicator comes on

Measurement Condition

Specified Condition

Battery positive (+) → Terminal F2-2 (SEC)

Battery negative (-) → Terminal F2-12 (E)

Security indicator comes on

Text in Illustration

*1	Component with harness connected (Accessory Meter Assembly)

NOTICE:

If the positive (+) lead and the negative (-) lead are incorrectly connected, the security indicator will not come on.
Voltage of more than 12 V will damage the security indicator.
If the voltage is too low, the security indicator will not come on.

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

REPLACE ACCESSORY METER ASSEMBLY

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