Toyota Venza manuals

Toyota Venza: 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.

(c) Turn the Techstream 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

-

OK:

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


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

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)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

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.

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

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


B

REPLACE IGNITION SWITCH ASSEMBLY (for 2GR-FE)


C

REPLACE IGNITION SWITCH ASSEMBLY (for 1AR-FE)


A

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)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

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)


OK

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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