Initialization Of VGRS System During PDS (PD025-06)

Publication date: 2006-03-13
Reference number: PD025-06

INITIALIZATION OF VGRS SYSTEM DURING PDS

TECHNICAL SERVICE BULLETIN

Reference Number(s): PD025-06, Date of Issue: March 13, 2006

LEXUS:	2007 GS 450h
GROUP:	PRE-DELIVERY SERVICE
COPYRIGHT:	© 2018 Lexus, a division of Toyota Motor Sales, USA License Agreement TMS1002

INTRODUCTION

This bulletin describes the initialization procedure for the Variable Gear Ratio Steering (VGRS) system.

The DCC fuse is removed at the assembly plant to reduce parasitic current draw from the battery during transport and storage. As a result of the removal of the DCC fuse, the VGRS system will be inoperative and the steering wheel may be off-center at the time the DCC fuse was removed.

After the DCC fuse is installed, the VGRS system will be operative, but the steering wheel may be off-center by 5 - 10 degrees to the right or left. This condition may also appear when the battery terminal has been disconnected.

Initialize the VGRS system following the procedure in this bulletin after installing the DCC fuse or when reconnecting the battery terminal.

NOTE: Do NOT adjust the steering wheel centering (i.e., do not adjust tie rod ends) BEFORE initialization of the VGRS system, or the steering may be off-center on the opposite side after initialization.

APPLICABLE VEHICLES

2007 model year GS 450h vehicles.

WARRANTY INFORMATION

OP CODE	DESCRIPTION	TIME	OFP	T1	T2
N/A	Not Applicable to Warranty	-	-	-	-

REQUIRED SSTS

ITEM NO.

SPECIAL SERVICE TOOLS (SSTs)

PART NUMBER

QTY

DRW⁽²⁾

Lexus Diagnostic Tester Kit ⁽¹⁾

NOTE:

All components from this kit/set are required
12 Megabyte Diagnostic Tester Program Card (P/N 01002593-005) with version 13.3a Software (or later) is required

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

LEX220036

CAN Interface Module Kit ⁽¹⁾

NOTE:

All components from this kit/set are required

01002744

⁽¹⁾	Essential SSTs.

⁽²⁾	Refers to drawer number in SST Storage System.

NOTE: Additional Diagnostic Tester Kits, CAN Interface Modules, Program Cards, or other SSTs may be ordered by calling SPX/OTC at 1-800-933-8335.

INITIALIZATION PROCEDURE

Install the DCC fuse to its original location.

Fig 1: Installing DCC Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Push the engine START/STOP switch to select the "IG-ON" mode and confirm that "Check VGRS" is displayed on the multi-information display.
Drive the vehicle on a straight road at 22 mph (35 km/h) or more for 5 seconds or longer.
At this point, the steering wheel will remain off-center 5-10 degrees.

NOTE: In this step, the neutral position of the steering wheel is recorded in the VGRS ECU memory.
Make several right and left turns. The speed when turning is not critical.
Stop the vehicle in a safe location. Turn the steering wheel from lock to lock at a speed of less than 90°/sec. Drive straight again, and the steering wheel should be centered.
Confirm the steering wheel is centered:
- Steering wheel is centered - Initialization is complete.
- Steering wheel is off-center - Go to step 7.
Confirm initialization has been completed.
1. Access the VGRS Data List using the Diagnostic Tester.
2. Confirm the "STRAIGH ANG FLG" parameter reads "VALID."
  NOTE:
  Prior to initialization, the "STRAIGH ANG FLG" parameter will read "INVALID."
  When the VGRS initialization procedure is complete, the "STRAIGH ANG FLG" parameter will change to "VALID."
  - If "VALID" and steering is off-center, refer to the Repair Manual.
  - If "INVALID," return to step 2 and perform driving procedure again.
  - If "INVALID" returns again, check for VGRS system DTCs and diagnose the condition following the procedures found in the Repair Manual.
Confirm the steering wheel is centered via a road test.