Toyota Venza: ECU Power Source Circuit

Toyota Venza Service Manual / Tire Pressure Monitoring / Tire Pressure Warning System / ECU Power Source Circuit

DESCRIPTION

This is the power source for the tire pressure warning ECU.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using the Techstream and write them down before removal.

It is necessary to perform registration (See page ) of the transmitter IDs into the tire
pressure warning ECU after the ECU has been replaced.

PROCEDURE

1.	INSPECT FUSE (ECU-IG NO. 2)

(a) Remove the ECU-IG No. 2 fuse from the driver side junction block.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
ECU-IG No. 2 fuse	Always	Below 1 Ω

REPLACE FUSE

2.	INSPECT IGNITION RELAY NO. 1

(a) Remove the IG1 relay from the driver side junction block.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 - 5	Battery voltage is not applied between terminals 1 and 2	10 kΩ or higher
3 - 5	Battery voltage is applied between terminals 1 and 2	Below 1 Ω

REPLACE IGNITION RELAY NO. 1

3.	CHECK HARNESS AND CONNECTOR (ECU - BATTERY AND BODY GROUND)

(a) Disconnect the D31 ECU connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
D31-7 (IG) - Body ground	Ignition switch ON	11 to 14 V
D31-7 (IG) - Body ground	Ignition switch off	Below 1 V

Text in Illustration

*1	Front view of wire harness connector (to Tire Pressure Warning ECU)

Standard Resistance:

Tester Connection	Condition	Specified Condition
D31-9 (GND) - Body ground	Always	Below 1 Ω

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

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