Toyota Venza manuals

Toyota Venza: IG Signal Circuit

DESCRIPTION

This circuit detects the ignition switch ON or off condition, and sends it to the main body ECU (driver side junction block assembly).

WIRING DIAGRAM



CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the display on the Techstream.

Main Body

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

IG SW

Ignition switch or engine switch IG signal/ON or OFF

ON: Ignition switch ON

OFF: Ignition switch off

-

OK:

Normal conditions listed above are displayed.


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

2.

INSPECT NO. 1 IGNITION RELAY

(a) Remove the No. 1 ignition relay from the main body ECU (driver side junction block assembly).


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

When battery voltage is not applied to terminals 1 and 2

10 kΩ or higher

When battery voltage is applied to terminals 1 and 2

Below 1 Ω


NG

REPLACE NO. 1 IGNITION RELAY


OK

3.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)

(a) Disconnect the 2A main body ECU (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

Always

10 to 14 V

Text in Illustration

*1

Front view of wire harness connector

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

(c) Disconnect the 2F main body ECU (driver side junction block assembly) connector.


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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

4.

CHECK VEHICLE CONDITION

(a) Check the vehicle condition.

Condition

Proceed to

w/o Smart Key System

A

w/ Smart Key System

B


B

GO TO STEP 7


A

5.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - IGNITION SWITCH)

(a) Disconnect the D12 ignition switch connector.


(b) Disconnect the 2G main body ECU (driver side junction block assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2G-10 - D12-2 (AM1)

Always

Below 1 Ω

2G-29 - D12-4 (IG1)

Always

Below 1 Ω

2G-10 - Body ground

Always

10 kΩ or higher

2G-29 - Body ground

Always

10 kΩ or higher

Text in Illustration

*1

Front view of wire harness connector

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

*2

Front view of wire harness connector:

(to Ignition Switch)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

6.

INSPECT IGNITION SWITCH

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

2 (AM1) - 4 (IG1)

Ignition switch off

10 kΩ or higher

Ignition switch ON

Below 1 Ω

Text in Illustration

*1

Component without harness connected

(Ignition Switch)



OK

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


NG

REPLACE IGNITION SWITCH

7.

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - MAIN BODY ECU)

(a) Disconnect the 2G main body ECU (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

2G-29 - Body ground

Engine switch on (IG)

11 to 14 V

Text in Illustration

*1

Front view of wire harness connector

(to Main Body ECU (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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