2008 Saturn Astra Owner's Manual - Page 241

Vehicle Service and Care TPMS Malfunction Light The TPMS will not function properly if one or more of the TPMS sensors are missing or inoperable. When the system detects a malfunction, the low tire warning light flashes for about one minute and then stays on for the remainder of the ignition cycle. Some of the conditions that can cause the malfunction light to come on are: 9-51 • Replacement tires or wheels do not match the vehicle's original equipment tires or wheels. Tires and wheels other than those recommended for the vehicle could prevent the TPMS from functioning properly. See Buying New Tires on page 9-54. Tire Inspection and Rotation Inspect tires regularly for signs of wear or damage. Also inspect the spare tire. For more information on tire inspection, see When It Is Time for New Tires on page 9-53. Rotating vehicle tires helps them to wear evenly and keeps the vehicle performing like it did when tires were new. Rotate the tires and check wheel alignment approximately every 5,000 to 8,000 miles (8 000 to 13 000 km) or when unusual tire wear is noted. See "Scheduled Maintenance" in the Index of the "Limited Warranty, Maintenance and Owner Assistance Information" manual for more information. Also check the wheels for damage, see Wheel Replacement on page 9-58 for more information. • Operating electronic devices or being near facilities using radio wave frequencies similar to the TPMS could cause the TPMS sensors to malfunction. If the TPMS is not functioning it cannot detect or signal a low tire condition. See your dealer/retailer for service if the TPMS malfunction light comes on and stays on. • One of the road tires has been replaced with the spare tire. The spare tire does not have a TPMS sensor. The TPMS malfunction light and DIC message should go off once you re-install the road tire containing the TPMS sensor. • One or more TPMS sensors are missing or damaged. The TPMS malfunction light should go off after the TPMS sensors are installed and the vehicle is driven for a few moments over 19 mph (31 km/h). See your dealer/retailer for service.