Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM000001BBR001X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: STEERING COLUMN: VARIABLE GEAR RATIO STEERING SYSTEM: C1554/54; EPS Relay Circuit; 2007 MY LX470 [08/2006 -        ]

DTC

C1554/54

EPS Relay Circuit

DESCRIPTION

When the VGRS ECU detects a malfunction in the power supply relay (located inside the VGRS ECU), the ECU turns on the warning light, records the DTC, and stops VGRS operation.

DTC No.

DTC Detection Condition

Trouble Area

C1554/54

The system detects a malfunction of the power source relay or an open circuit.
  • VGRS fuse
  • VGRS ECU

WIRING DIAGRAM

PROCEDURE

1.

CHECK VOLTAGE BETWEEN TERMINALS PIG AND PGND OF VGRS ECU CONNECTOR

(a) Record and clear VGRS DTCs.

(b) Start the engine and measure the voltage between terminals V10-1 (PIG) and V10-2 (PGND) of the VGRS ECU.

Result

Result

Proceed to

9 to 16 V

A

Below 9 V

B

Above 16 V

C
B

CHECK AND REPAIR HARNESS AND VGRS FUSE

C

CHECK AND REPAIR CHARGING SYSTEM

A

2.

CHECK VGRS FOR DTC C1554/54

(a) Is DTC C1551/54 present?

NOTICE:

Fault may be intermittent. Check harness and connectors carefully and retest.

YES

REPLACE VGRS ECU

NG

NO FAULT DETECTED