Toyota Venza: Ignition Switch Circuit

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

DESCRIPTION

The main body ECU (driver side junction block assembly) determines the ignition switch position (OFF, ACC, ON) based on signals from the IG or ACC circuit.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Select the items below in the Data List and read the display on the Techstream.

Main Body

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
IG SW	Ignition switch ON signal/ON or OFF	ON: Ignition switch ON OFF: Ignition switch off	-
ACC SW	Ignition switch ACC signal/ON or OFF	ON: Ignition switch ACC OFF: Ignition switch off	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

IG SW

Ignition switch ON signal/ON or OFF

ON: Ignition switch ON

OFF: Ignition switch off

ACC SW

Ignition switch ACC signal/ON or OFF

ON: Ignition switch ACC

OFF: Ignition switch off

OK:

When the ignition switch is operated, the display changes as shown in the table.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (BATTERY - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 2A driver side junction block assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
2A-1 - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to Driver Side Junction Block Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT IGNITION SWITCH ASSEMBLY

(a) Remove the ignition switch assembly (See page for 2GR-FE,
for 1AR-FE).

(b) Disconnect the D12 ignition switch assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D12-4 (IG1) - D12-2 (AM1)	Ignition switch ON	Below 1 Ω
D12-3 (ACC) - D12-2 (AM1)	Ignition switch ACC	Below 1 Ω

Text in Illustration

*1	Component without harness connected (Ignition Switch Assembly)
*2	No Pin
*3	LOCK
*4	ACC
*5	ON
*6	START

Result

Result	Proceed to
OK	A
NG (for 2GR-FE)	B
NG (for 1AR-FE)	C

REPLACE IGNITION SWITCH ASSEMBLY (for 2GR-FE)

REPLACE IGNITION SWITCH ASSEMBLY (for 1AR-FE)

4.	CHECK HARNESS AND CONNECTOR (DRIVER SIDE J/B - DRIVER SIDE J/B)

(a) Disconnect the 2G driver side junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2G-10 - 2G-29	Ignition switch ON	Below 1 Ω
2G-10 - 2G-9	Ignition switch ACC	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Driver Side Junction Block Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - BODY GROUND)

(a) Disconnect the 2F driver side junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2F-16 - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Driver Side Junction Block Assembly)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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