School me on DSC and DCT

[Rucky]

Per [ref]Rucky[/ref] link shared above the infoguide references the following button, but i cant see what this actually does... can anyone enlighten me?:

Resets the tyre pressure monitoring system when you have pumped up your tyres to the correct pressures.
TPMS being a function of relative wheel speed so a flat tyre rotates a bit slower and it trips. Wheel speed sensing for TPMS is also relevant to DSC as they are all interlinked.

 

[Marcoose]

TPMS being a function of relative wheel speed so a flat tyre rotates a bit slower and it trips.

I did not know that.

 

[Anonymous]

Some confusion on tyre pressure warning systems...

There are two discrete systems...

Many earlier cars and in some markets even today use a 2nd order system that compares the rotational speed of each wheel, it deduces by comparing relative speeds by using the ABS wheel sensors whether one wheel is rotating slower and flags that up as a possible tyre pressure issue. Often called TPM.

Later systems and mandated in some markets is TPMS, where a sensor in each wheel recess inside the tyre measures the actual pressure and transmits that via a radio link to a display..usually these displays show actual pressure rather than a simple green/red type traffic light

 

[Rucky]

No confusion, the button in question resets the Tyre pressure monitor system and thus the wheel speed datums.
But yes I agree some cars have direct pressure measurement which has nothing to do with rotational speed.

 

[Anonymous]

No confusion, the button in question resets the Tyre pressure monitor system and thus the wheel speed datums.
But yes I agree some cars have direct pressure measurement which has nothing to do with rotational speed.

Since this was originally an E89 discussion I was pointing out that earlier E89s had TPM and later ones TPMS...