Tire Monitor System - Activation & Initialization

L-SB-0063-11

August 4, 2011

Tire Pressure Warning System Activation & Initialization

Service Category
General

Section
Pre-Delivery Service

Market
USA





Applicability

Introduction

2012 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 inflation pressure is NOT reduced by 6 psi (0.4 kgf/sq.cm 40 kPa) or more within 30 seconds the tire pressure warning valves/sensors will NOT be activated.

NOTE

This operation is required for the system to be activated and MUST be performed for each tire (except the spare tire) one at a time.

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 C21 11 - C21 14 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.