Scheme 9
Scheme 10
Scheme 11
Scheme 12
Scheme 13
Normal Operation
The TPMS module requires an operating voltage in a range between 10 and 17 volts.
Voltage is supplied by circuit 1002 (BK/PK) (ignition feed) and circuit 3049 (BK/LG) (B+ voltage at all times). Ground is provided through circuit 57 (BK).
With the ignition on, the TPMS module enters the training mode when a combination of inputs are received from the brake pedal position (BPP) switch and the ignition status switch (from the instrument cluster).
The BPP signal and ignition status signal are sent to the TPMS module on the SCP network.
If there is a fault in the TPMS, the message center receives information from the TPMS module. Faults such as low tire pressures, damaged or nonfunctional tire pressure sensors, and TPMS module DTCs are sent to the message center.
The horn output relay circuit receives a signal from the body security module (BSM) during the TPMS module training mode.
Voltage to the horn output relay circuit is carried through circuit 490 (DB).
Each tire pressure sensor transmits a specific radio frequency to the TPMS module once every minute when the vehicle ignition is on.
The tire pressure sensor valve stem serves as an antenna which sends the radio signal to the TPMS module. The tire pressure sensor is battery powered.