Tech Tip: Don’t Let TPWS Problems Leave You Flat – UnderhoodService
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Tech Tip: Don’t Let TPWS Problems Leave You Flat

The Tire Pressure Warning System (TPWS) on certain 2004 and 2005 Lexus models won’t turn off even after a tire has been repaired. Once a repair is made, the system needs to be re-initialized. During initialization, the Tire Pressure Warning System, located within the ABS or Skid Control ECU, learns the tire sizes from rotational speeds and resonance frequencies. Once the system has initialized ….

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The Tire Pressure Warning System (TPWS) on certain 2004 and 2005 Lexus models won’t turn off even after a tire has been repaired. Once a repair is made, the system needs to be re-initialized. During initialization, the Tire Pressure Warning System, located within the ABS or Skid Control ECU, learns the tire sizes from rotational speeds and resonance frequencies. Once the system has initialized, if tire pressures drop, the TPWS light will illuminate. Applicable vehicles: 2004-2005 model year LS 430 and RX 330 vehicles

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Initialization conditions:
The Tire Pressure Warning light can illuminate requiring initialization if any of the following changes occur: When air pressure is adjusted up or down; when the tires are rotated; when one or more tires are replaced; when suspension components (i.e., struts, shocks, springs, knuckle) are replaced; when an alignment is performed.

1. Adjust the tire pressure to the specification.

2. Turn the IG switch on, but do not start the engine.

3. a. Without Multi-Display: Press and release the Tire Pressure Warning switch to turn the Tire Pressure Warning light off.
b. With Multi-Display: Press the Tire Pressure Warning switch to turn the Tire Pressure Warning light off.

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4. a. Without Multi-Display: Press and hold the Tire Pressure Warning switch until the Tire Pressure Warning light blinks three times.
b. With Multi-Display: Press and hold the Tire Pressure Warning switch until “Pressure Initial” appears on the Multi-Display.

5. The TPWS will typically initialize within one hour during normal driving conditions.

Courtesy of ALLDATA.

For additional information on ALLDATA, visit www.alldata.com.

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