The system does not replace proper tire maintenance. You must maintain correct tire pressure even if underinflation does not trigger the warning light.

The tire pressure monitoring system has a malfunction indicator light that alerts you when the system is not working properly. The malfunction indicator lamp and the low tire pressure warning light are linked. When the system detects a malfunction, the warning light flashes for approximately one minute and then stays on. This sequence is repeated each time you switch on the ignition as long as the malfunction persists.

When the malfunction indicator lamp is illuminated, the system may not be able to detect or signal tire pressures that are too low. A malfunction can occur for a variety of reasons, including the installation of a spare tire or spare wheel that prevents the system from working properly. Always check the tire pressure monitoring system malfunction indicator after replacing one or more tires or wheels on your vehicle. Make sure the system continues to function properly with the replacement tires or wheels. Refer to the paragraph If the temporary spare tire is fitted in this section.

Effect of temperature on tire pressure

Under normal driving conditions, tire pressure may increase by a maximum of .3 bar compared to a cold start situation.

If the vehicle remains stationary overnight and the temperature drops considerably compared to the daytime temperature, the tire pressure may drop by a maximum of .2 bar for a drop of 17°C or more from the ambient temperature. The system detects this drop in pressure as being significantly lower than the correct inflation pressure and the warning light illuminates.

Understanding the tire pressure monitoring system

The system measures the pressure of all four tires and sends the tire pressure readings to the vehicle.

The system detects this lower pressure as being significantly lower than the correct inflation pressure and the warning light illuminates. You need to inflate the tires to the correct pressure.

When fitting the temporary spare tire

If you need to replace a road wheel and tire assembly with a temporary spare, the system continues to detect a fault. The purpose is to remind you to have the damaged wheel and tire assembly repaired and to install the repaired wheel and tire assembly on the vehicle. To restore the system to proper operation, you must have the wheel and tire assembly repaired and reinstalled on your vehicle.

• When inflating the tires
• Inflate tires only when they are cold.
• If the light is on:
• Check each tire to make sure none are flat.
• If one or more tires are flat, make repairs as needed.
• Check tire pressure and inflate all tires to the correct pressure. See   Technical Specifications .
• You must follow the system reset procedure after each tire change or tire pressure adjustment.

To maintain the load capacity of the vehicle, the pressure of the front tires must be different from that of the rear tires.

The system activates the warning light when the front and rear tire pressures are different.

Tires should be rotated regularly to ensure consistent performance and maximum tire life. The system therefore needs to know when the tires have been rotated to determine which tire pairs are fitted to the front and rear axles. Using this information, the system can correctly detect any lack of tire pressure and warn the driver