GM Service Manual Online
For 1990-2009 cars only

Tire Inflation Monitor (TIM) also known as Tire Pressure Monitor (TPM) is a unique feature for this vehicle. The TIM system will notify the driver when an urgent LOW inflation pressure condition is present in one of the vehicle's tires so that the driver can quickly perform the needed maintenance. When all repairs are completed (such as inflation of tires in order to correct pressure, or the replacement of a tire), press the Tire Inflation Reset Switch in order to reset the TIM system.