2003 Saab 9-3 Owner's Manual - Page 208

208 Car care The receiver is located in the trunk. Tire pressure information is sent wirelessly to the receiver. The system checks the tire pressure when the car is travelling over 18 mph (30 km/h). The system is "self-learning", which means that the position of the wheels can be changed without requiring adjustments to the monitoring system. The spare wheel does not have a sensor. The sensor batteries have an average life of 10 years. The batteries cannot be changed but require the sensor units to be replaced. The system does not warn if a tire is overinflated. Valve with sensor If the tire pressure drops If the tire pressure drops 0.3 bar (4 psi) below the recommended pressure, the SID will issue a warning as to which tire is affected. Tire pressure low, front left. Check tires. Adjust the tire pressure as soon as possible. Valve without sensor If the tire pressure continues to drop, the SID will issue a warning alarm when the pressure is 0.6 bar (9 psi) below the recommended value. Flat tire front left. Make a safe stop. Reduce speed (avoid heavy braking and violent steering wheel movements) and stop the car as soon as it is safe to do so. Change the wheel.