STEERING COLUMN: POWER TILT AND POWER TELESCOPIC STEERING COLUMN SYSTEM: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 J
Service Category: Steering	Section: Steering Column
Model Year: 2008	Model: LX570	Doc ID: RM000000XZ7017X
Title: STEERING COLUMN: POWER TILT AND POWER TELESCOPIC STEERING COLUMN SYSTEM: DESCRIPTION (2008 LX570)

IG Power Source Circuit

DESCRIPTION

When the engine switch is turned on (IG), the IG power source circuit supplies positive (+) voltage to the multiplex tilt and telescopic ECU.

The multiplex tilt and telescopic ECU also receives engine switch signals via this circuit.

1.	INSPECT FUSE (ECU-IG No. 1)

(a) Remove the ECU-IG No. 1 fuse from the main body ECU.

(b) Measure the resistance of the fuse.

Standard Resistance:

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

2.	CHECK MULTIPLEX TILT AND TELESCOPIC ECU (IG TERMINAL VOLTAGE)

(a) Disconnect the E27 connector from the multiplex tilt and telescopic ECU.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
E27-8 (IG) - E27-11 (GND)	Engine switch on (IG)	11 to 14 V

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E27-11 (GND) - Body ground	Always	Below 1 Ω

4.	CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - MAIN BODY ECU)

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
2D-56 - Body ground	Engine switch on (IG)	11 to 14 V