A calibration process is required for the TPMS module to learn the initial rolling radii of the four tires and peak tire resonance values. The calibration procedure must be performed any time the tire pressures are adjusted, or when the tires are rotated or replaced.
The TPMS calibration procedure is initiated by pressing the TPMS switch (if equipped) or doing customization (without TPMS switch).
Upon the completion of system calibration, vehicle mileage and calibration data is stored in the VSA modulator-control unit. If larger diameter accessory wheels have been installed, the TPMS system needs to be calibrated to recognize the new wheel size. This procedure is performed using the HDS threshold rewriting function.