Tire Monitor System - Activation and Initialization

L-SB-0028-12

April 19, 2012

Tire Pressure Warning System Activation & Initialization

Service Category
General

Section
Pre-Delivery Service

Market USA





Applicability

Introduction

2013 model year RX 450h are equipped with a direct-type Tire Pressure Warning System (TPWS). Each tire (except the spare tire) has a tire pressure warning valve/sensor that measures tire pressure. The data is transmitted to the Tire Pressure Warning System antenna/receiver and then to the Tire Pressure Warning System ECU.

During Pre-Delivery Service (PDS), the tire pressure warning valves/sensors must be activated and the system initialized according to the procedure in this bulletin.





Required Tools & Equipment





Warranty Information





Reference

^ After cycling the ignition to the "IG-ON" position, the Low Tire Pressure Warning Light will blink until all the tire pressure warning valves/sensors are activated.

^ The Diagnostic Trouble Codes (DTCs) listed below may be stored in the TPWS ECU until the tire pressure warning valves/sensors are activated.

^ The DTCs will automatically clear when the tire pressure warning valves/sensors are activated.

Activation Procedure

1. Connect TIS techstream.

2. Cycle the ignition switch to the "IG-ON" position and check that the Low Tire Pressure Warning Light blinks.

3. Press or remove the valve core to reduce the tire inflation pressure rapidly by 6 psi (0.4 kgf/sq.cm, 40 kPa), or more, within 30 seconds.

If the tire in.ation pressure is NOT reduced by6 psi (0.4 kgf/sq.cm, 40 kPa), or more, within 30 seconds, the tire pressure warning valves/sensors will NOT be activated.

4. Check that the Low Tire Pressure Warning Light goes OFF after all the tire pressure warning valves/sensors are activated.

5. Using TIS techstream, check for TPWS DTCs.

^ If NO DTCs are stored, go to step 1 of the Initialization Procedure.

^ If DTCs C2111 - C2114 are stored, repeat step 3.

^ If any other DTCs are stored, refer to the Repair Manual.

Initialization Procedure

1. Cycle the ignition switch to the "IG-ON" mode and connect TIS techstream.

2. Adjust all tires (except the spare tire) to the standard tire inflation pressure, as indicated on the Tire and Loading Information label located inside the vehicle and confirm that the Low Tire Pressure Warning Light is OFF.

3. Push and hold the Tire Pressure Warning "SET" Switch for 3 seconds until the Low Tire Pressure Warning Light blinks 3 times and then turns OFF to set the tire pressure initialization.

4. Cycle the ignition switch to the "OFF" position and then to the "IG-ON" position.

5. Check the tire pressure values of all the tires using TIS techstream.

NOTE

^ It can take 2 - 3 minutes for the tire pressure values to be displayed on the TIS techstream Data List.

^ If the tire pressure values CANNOT be displayed on the TIS techstream screen, the initialization is NOT complete. Repeat steps 2 - 4.

© 2012 Lexus, a division of Toyota Motor Sales, USA