TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 J
Service Category: Suspension	Section: Tire Pressure Monitoring
Model Year: 2008	Model: LX570	Doc ID: RM000000XN2026X
Title: TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: DESCRIPTION (2008 LX570)

ECU Power Source Circuit

DESCRIPTION

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

NOTICE:

It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU after the ECU and/or the tire pressure warning valve and transmitter has been replaced.

1.	INSPECT FUSE (ECU-IG NO. 4)

(a) Remove the ECU-IG No. 4 fuse from the cowl side junction block RH.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
ECU-IG No. 4 fuse	Always	Below 1 Ω

2.	CHECK HARNESS AND CONNECTOR (ECU - BATTERY)

(a) Disconnect the L10 ECU connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
L10-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
L10-1 (IG) - Body ground	Engine switch off	Below 1 V

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

(a) Disconnect the L10 ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
L10-7 (GND) - Body ground	Always	Below 1 Ω

4.	CHECK HARNESS AND CONNECTOR (ECU - FUSE)

(a) Disconnect the L10 ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
L10-1 (IG) - Body ground	Always	10 kΩ or higher