Circuit Operation

The Electronic Brake Traction Control Module (EBTCM) uses the wheel speed sensors to determine if a low tire pressure condition exists. After the vehicle has been driven for at least 10 miles, the EBTCM compares the wheel speed sensor inputs to the normal conditions. If the EBTCM senses a change in wheel speed at one wheel comparable to a change in tire pressure of at least 56 kPa (8 psi) from the other three tires, the EBTCM will then send a signal through the serial data (Class II) circuit 1122, the splice pack SP205, and circuit 1036 to the instrument cluster, this tells the EBTCM to turn on the LOW TIRE indicator. The serial data (Class 11) can be accessed using the scan tool connected to the Data Link Connector (DLC) on terminal 2.

Once the LOW TIRE indicator is turned on and then the low tire is repaired or replaced, the indicator can be turned off by using the tire inflation reset switch in the fuse block. Pressing this applies a ground from G203 through circuit 1550, the switch, and circuit 1055 to connector C1 terminal B10 of the EBTCM. The EBTCM then turns off the signal to the LOW TIRE indicator. Turning the ignition switch to the OFF position and then to the RUN position will also reset the indicator.