TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: ECU Power Source Circuit; 2007 MY LX470 [08/2006

Last Modified: 7-3-2017	6.8:8.0.40	Doc ID: RM0000018LV008X
Model Year Start: 2007	Model: LX470	Prod Date Range: [08/2006 - ]
Title: TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: ECU Power Source Circuit; 2007 MY LX470 [08/2006 - ]

ECU Power Source Circuit

DESCRIPTION

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

NOTICE:

When replacing the tire pressure warning ECU and receiver, read the IDs stored in the old ECU using the intelligent tester and write them down before removal.
It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.

1.	INSPECT FUSE (ECU-IG1)

(a) Remove the ECU-IG1 fuse from the cowl side junction block LH.

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

Standard resistance:

Tester Connection	Condition	Specified Condition
ECU-IG fuse	Always	Below 1 Ω

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

(a) Disconnect the T35 ECU connector.

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

Standard voltage:

Tester Connection	Switch Condition	Specified Condition
T35-1 (IG) - Body ground	Ignition switch ON	10 to 14 V

Standard resistance:

Tester Connection	Condition	Specified Condition
T35-9 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the T35 ECU connector.

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

Standard resistance:

Tester Connection	Condition	Specified Condition
T35-1 (IG) - Body ground	Always	10 kΩ or higher

REPLACE FUSE AND REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE FUSE