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Changing a wheel and replacing tires
The tire settings on the on-board computer must be updated after changing a wheel.
If the tire settings are not updated, the message "Wheel change? Input new TPM settings!" is displayed on the on-board computer.
Attention to TPM Malfunction Indicator
Your vehicle has also been equipped with a Tire Pressure Monitoring (TPM) malfunction indicator when the system is not operating properly.
The TPM malfunction indicator is combined with the low tire pressure telltale.
When the system detects a malfunction, the telltale will flash for approximately one minute and then remain continuously illuminated. This sequence will continue upon subsequent vehicle start-ups as long as the malfunction exists.
When the malfunction indicator is illuminated, the system may not be able to detect or signal low tire pressure as intended.
TPM malfuntions may occur for a variety of reasons, including the installation of replacement or alternate tires or wheels on the vehicle that prevent the TPM from functioning properly.
The warning light in the speedometer lights up:
– When a loss in pressure has been detected.
– When learning newly mounted wheels/wheel sensors, as long as the vehicle's own wheels have not yet been recognized.
In the event of a defect in Tire Pressure Monitoring or a temporary fault, the warning light in the speedometer flashes for approx. one minute and then remains continuously illuminated.
The tire pressure warning light in the instrument panel goes out only when the cause of the fault has been rectified.
Monitoring of the other wheels is continued if there is a fault in one or two wheel transmitters.
– The tire pressure warning light lights up.
– The message "TPM partial monitoring" is displayed on the on-board computer.
– No tire pressures are displayed on the onboard computer for wheels with faulty wheel transmitters.
In the event of faults the Tire Pressure Monitoring cannot monitor the tire pressure.
The warning light in the speedometer flashes for approx. one minute and then remains continuously illuminated and a corresponding message appears on the on-board computer.
Monitoring is not active when:
– the Tire Pressure Monitoring is faulty,
– wheel transmitters for the Tire Pressure Monitoring are missing,
– during the learning phase after the tire settings have been updated,
– after a wheel change without updating the tire settings,
– more than four wheel transmitters are detected,
– there is external interference by other radio sources, e.g. wireless headphones,
– tire temperatures are too high.
Pressure increase as the result of temperature increase
In accordance with physical principles, the air pressure changes as the temperature changes. The tire pressure increases or decreases by around 1.5 psi/0.1 bar/10 kPA for every 18 °F (10 °C) change in temperature.
The Tire Pressure Monitoring takes this relationship between tire pressure and temperature into account.
Tire pressure specifications
Information on tire pressure for public roads can be found in this Owner's Manual in the Technical Data chapter or on the tire-pressure plate in the left door aperture.
These values apply to cold tires at 68 °F (20 °C) ambient temperature.