A/T Controls - Brake Hold System Won't Release

TRANSMISSION & CLUTCH
TC004-07

Title:
BRAKE HOLD SYSTEM DOES NOT
RELEASE UPON ACCELERATION

Models:
'07 LS 460/460L

April 16, 2007

Introduction

Some 2007 model year LS 460 vehicles may display a condition where the vehicle does NOT accelerate from a stop with the Brake Hold System engaged. The Transmission Control Module (TCM) logic has been revised to prevent this condition.

Applicable Vehicles

^ 2007 model year LS 460/460L vehicles produced BEFORE the Production Change Effective VINs shown below.





Production Change Information





Parts Information

^ The TCM should NOT be replaced as part of the Repair Procedure.

^ Authorized Modification Labels may be ordered in packages of 25 from the Materials Distribution Center (MDC) through Dealer Daily Dealer Support Materials System or by calling the MDC.





Warranty Information

Applicable Warranty*
This repair is covered under the Lexus Powertrain Warranty. This warranty is in effect for 72 months or 70,000 miles, whichever occurs first, from the vehicle's in-service date.

* Warranty application is limited to correction of a problem based upon a customer's specific complaint.





Required Tools & Material





Calibration Identification Chart

Repair Procedure





1. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Figure 1. Confirm if the TCM calibration has been updated. If the calibration ID listed is NOT the latest TCM calibration go to step 2.

2. Flash reprogram the TCM.

Note:
^ The GR8 Battery charger MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash reprogramming the vehicle.

^ For details on how to use the GR8 Battery charger please refer to the GR8 Instructions Manual, located on TIS, Diagnostics - Battery.

Follow the procedures outlined in TSIB No. SS002-07, "Techstream ECU Flash Reprogramming Procedure, " and flash the TCM with the NEW calibration file update.

3. Install the Authorized Modifications Label.

A. Using a permanent marker, enter the following information on the label:

^ TCM part number: [Refer to the Parts Information section for the CURRENT PART NUMBER]

^ Calibration ID(s): [Refer to the Calibration Identification Chart for the NEW CALIBRATION ID]

^ Dealer Code

^ Repair Date

^ Change Authority (this TSIB number): TC004-07

B. Affix the Authorized Modifications Label to the vehicle at the location shown in Figure 1. The Authorized Modifications Label is available through the MDC, P/N 00451-00001-LBL.

4. The repair is complete. Test drive the vehicle to confirm normal operation.