| The tyre pressure monitor system is part of the software in the ABS control unit -J104-. The system is used to detect slow tyre pressure loss from a wheel. Event memory entries for the tyre monitor display are stored in the ABS control unit -J104-. The tyre pressure display compares the wheel speeds and consequently the rolling circumference of the individual wheels via the ABS sensors. |
| After the following work or modifications, the tyre pressure monitor display button -E492- must be pressed and held until a confirmation is sounded. |
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| Change in tyre pressure |
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| Changing one or more wheels |
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| Interchanging wheels, e.g. from front to rear |
| A change in the wheel's rolling circumference will be indicated by the TPM warning lamp -K220- lighting up in the instrument cluster. A tyre's rolling circumference may change as a result of: |
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| Insufficient tyre inflation pressure. |
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| Structural tyre damage. |
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| One-sided loading of vehicle |
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| Increased load on one axle, e.g. due to towing a trailer |
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