Toyota Venza: IG Signal Circuit

Toyota Venza Service Manual / Lighting (int) / Lighting System / 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.

(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	-

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.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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
3 - 5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

REPLACE NO. 1 IGNITION RELAY

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))

(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))

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK VEHICLE CONDITION

(a) Check the vehicle condition.

Condition	Proceed to
w/o Smart Key System	A
w/ Smart Key System	B

GO TO STEP 7

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.

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

Front view of wire harness connector

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

Front view of wire harness connector:

(to Ignition Switch)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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
2 (AM1) - 4 (IG1)	Ignition switch ON	Below 1 Ω

Text in Illustration

*1	Component without harness connected (Ignition Switch)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

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))

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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