To reset, make sure you are on the screen with the tire pressures
displayed and the key is in position 2. press the reset button on the cluster shell (that also resets the trip odo) and hold. Display
will read "monitor current pressures? or reactivate system?"
and then will instruct you to use the + button on the wheel or
press the reset button and hold. This info can also be found in that massive owners manual under TPC for tire pressure monitor.
I would also recommend upping the pressures to 32psi front and rear which will keep the SL from munching on it's tires too fast.
Have fun.
DR.D