Check Tire Pressure

The amber CHECK TIRE PRESSURE (Pontiac) or the LOW TIRE PRESSURE (Oldsmobile) indicator is commanded on by the EBCM via a Class 2 serial data message to the instrument cluster.

To reset the tire pressure, the BCM reads a momentary switch found in the LH IP Junction Block arid transmits a Class 2 serial data message to the instrument cluster. The switch must be momentarily depressed twice (2) in order to enter the Tire Inflation Monitoring System (TIMS) reset stage. At this point the CHECK TIRE PRESSURE (Pontiac) LOW TIRE PRESSURE (Oldsmobile) flashes at 1 Hz by the instrument cluster to inform the driver that the TIMS reset has chosen Oil Life or TIMS. The driver then has a time period to depress and hold the switch. Once this condition is met the instrument cluster sends out a Class 2 serial data Low Tire Pressure Reset message. The EBCM reacts to this message by determining the new tire pressure. In addition, the indicator illuminates for a period of time and then turns off when the reset period is complete. The reset program is exited under either of the following conditions:
^ If the reset switch is not depressed for the correct number of times
^ If the reset switch is not depressed for the correct time periods

When the BCM receives the reset acknowledge report from the EBCM, an acknowledgment chime shall sound.

Upon a loss of Class 2 serial data between the EBCM and the instrument cluster, the commanded indicator remains in its last state. Upon a loss of Class 2 serial data between the BCM and the instrument cluster, the BCM commanded chime state remains off.