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The Tire Pressure Warning System
The 2006 Lexus IS350 is outfitted with a tire pressure warning system, which detects low tire pressure and displays a warning on the multi-information display. When the display shows “CHECK SYSTEM” and includes a lit symbol of an exclamation mark inside of a bulging flat tire, it is time to pull over and check for a potential flat tire.
Occasionally on a cold day, the warning may light up because the tire pressure is lower than normal due to the low temperature. However, this is not any cause for concern as the drop in pressure is temporary.
If the tire is truly flat from damage to the tire, then of course it must be either repaired or replaced. Once it has been repaired/replaced, then the Tire Pressure Warning System will need to be reset with the procedure outline below.
How To Reset The Tire Pressure Sensor
At the lower-left hand side of the steering column, there is a set of three buttons: one center circular button labeled “ON/OFF”, and two arrow buttons on each side of the circular button. The left and right buttons cycle through the menu on the multi-information display. In order to reset the tire pressure sensor, use the following reset procedure:
- Ensure the vehicle’s tires are all filled with air to the proper inflation pressure (recommended tire pressures are normally found on a sticker on the inside jamb of the driver’s side door frame).
- Park the vehicle and start the engine.
- Press the left or right arrow buttons until the “PRESSURE INITIAL” screen comes up on the multi-information display.
- Press and hold the center button for at least 3 seconds until you hear a chime and the tire pressure indicator light flashes 3 times.
- Drive the vehicle and the warning light should disappear shortly after.
If the “PRESSURE INITIAL” warning does not go away after following the reset procedure and a short drive of the vehicle, then it is best to have the tire pressure sensors scanned and evaluated for further issues. When I personally had this problem, I took the car into the local America’s Tire and they determined that two of the sensors’ batteries were dead.
Tire Pressure Monitoring System (TPMS) batteries are of the lithium-ion type, and they last between 5-10 years. Given the Lexus IS350 we own is a 2006, it lasted 12 years–longer than expected. I opted to have the TPMS sensors in all four tires replaced at the same since the other working two might be on its last legs. After this was completed, the tire technician programmed the sensors. I performed the reset procedure as outlined above, and after 10 seconds of driving, the tire pressure warning finally went off.