VARIABLE GEAR RATIO STEERING: VARIABLE GEAR RATIO STEERING SYSTEM: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 C
Service Category: Steering	Section: Steering Column
Model Year: 2008	Model: LX570	Doc ID: RM000000YUE00JX
Title: VARIABLE GEAR RATIO STEERING: VARIABLE GEAR RATIO STEERING SYSTEM: DESCRIPTION (2008 LX570)

DTC

C15C7/78

DC Motor Power Source Voltage Malfunction

DTC

C15C8/79

Power Supply Relay Failure

DESCRIPTION

The steering control ECU monitors PIG (motor power source voltage) and detects a malfunction in the power supply relay (located inside the steering control ECU).

If the steering control ECU detects a malfunction, it will turn on the master warning light, store these DTCs, and stop VGRS operation.

DTC Code	DTC Detection Condition	Trouble Area
C15C7/78	The steering control ECU detects that the IG terminal voltage is between 9 and 16 V, and the PIG terminal voltage is below 7 V or higher than 18.5 V for 2.4 seconds.	Harness or connector Steering control ECU
C15C8/79	The steering control ECU detects a malfunction in the power source relay or an open circuit.	Harness or connector Steering control ECU

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

The fault may be intermittent. Check the harnesses and connectors thoroughly and retest.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Record and clear the DTCs .

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E82-7 (PGND) - Body ground	Always	Below 1 Ω
E83-8 (PGD2) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Condition	Specified Condition
E82-8 (PIG) - Body ground	Always	11 to 14 V

2.	RECONFIRM DTC OUTPUT

(a) Check for DTCs .

Result

Result	Proceed to
C15C7/78 or C15C8/79 is not output	A
C15C7/78 or C15C8/79 is output	B