Tire Pressure Warning Reset Switch: Description and Operation

GF40.15-P-5127SX System Activation Button, Component Description
MODEL 221 with CODE (475) Tire pressure monitor (Siemens)
MODEL 221
with CODE (494) USA version
with CODE (498) Japan version
with CODE (470) Tire pressure monitor (base)






Task
The tire pressure monitor system is permanently operational and is not operated actively by the driver. Each time the interior CAN is woken up by the starting procedure or ignition "On" (circuit 15) N88, the TPM [RDK] control unit carries out a reinitialization and starts to transmit signals to the multifunction display A reactivation of the TPM system can be triggered by the system selection button and the scroll forward/back button.

The TPM system can be reactivated in the following cases:
- Tire pressure changed (e.g. by refilling)
- After each wheel or tire change

With the activation of the TPM system the air pressure values of the wheels set by the driver are stored in the TPM [RDK] control unit as specified monitoring data.