Instruments - Tire Pressure Warning Light ON

PRODUCT GENERAL INFORMATION
PG003-04

Title:
TIRE PRESSURE WARNING SYSTEM
LIGHT ON

Models

'04 LS 430

June 21, 2004

Introduction
On some 2004 model year LS 430 vehicles, the low tire message indicator on the combination meter display may illuminate without a noticeable change in tire pressure. This condition may be caused by one of the following conditions:

^ If the initialization of the Tire Pressure Warning System (TPWS) is not conducted correctly during the Pre-Delivery Service Inspection (PDS), the low tire message indicator on the combination meter display may illuminate without a noticeable change in tire pressure. Always verify the system has been initialized during PDS.

^ In rare instances, the TPWS operating logic may be sensitive to the various driving conditions under which a particular customer is operating their vehicle. The operating logic has been changed in the Skid Control ECU to help improve this condition for that particular customer.

For those cases where the system may be too sensitive, the operating logic has been changed in the Skid Control ECU to help improve this condition for that particular customer.

NOTE:
Most vehicles will require reinitialization of the TPWS only. Replace Actuator Assembly only on vehicles where the customer's specific driving patterns cause the TPWS light to come on.

Applicable Vehicles

^ 2004 model year LS 430 vehicles produced BEFORE the Production Change Effective VINs shown below.





Production Change Information





Parts Information





Warranty Information

Applicable Warranty*:
This repair is covered under the Lexus Comprehensive Warranty. This warranty is in effect for 48 months or 50,000 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.





Initialization Procedure

NOTE:
In the following cases, the TPWS light may illuminate:

^ Tire size is different from the original equipment specification.

^ Different sizes or types of tires are used simultaneously.

^ A spare tire, snow tires or tire chains are used.

^ The vehicle is driven on an unpaved, extremely rough or slippery road.

^ One of the tires on the vehicle is extremely worn.

^ The vehicle is towing a trailer.

^ Continuous rapid acceleration/deceleration or sharp turns.

^ Outside temperature is below 32°F (0° C) or over 104°F (40° C).

1. With the vehicle stopped, turn the ignition switch to the ON position.





2. Press tire pressure warning reset switch once to turn the "Low Tire" indicator OFF.





3. Then press and hold the tire pressure warning reset switch again until the "Pressure Initial" indicator comes on.





1. Replace the brake actuator assembly.

2. Perform Zero Point Calibration. Refer to TSIB No. BR001-04 "Zero Point Calibration."

3. Initialize the TPWS again using the procedure in step 2.