I have a 2010 Matrix AWD that i am considering for winter tires .... i normally buy a second set of steel rims/tires for winter but the TPMS system is causing me to hesitate. My Lexus has 2 internal memory's for each of the 2 sets of TPMS units ..... the Matrix does not.
So ..... does that mean a trip to the dealer every time i swap sets 
?
KC
Direct Tire Pressure Monitoring Systems (TPMS) mount pressure sensors inside each wheel. Indirect systems do not utilize TPMS sensors, instead they monitor the rotational speed of each wheel via the Electronic Stability Control (ESC) and anti-lock braking systems (ABS). An under inflated tire has a slightly smaller diameter and will rotate faster than the others.
To retain Direct TPMS functionality with winter tires pressure sensors must be installed in the winter wheels at $80- $100 each. The new sensors must be “awakened” with a TPMS Activating Tool to communicate with the car's ECU, an additional $60- $100 service charge.
It can also be a seasonal wallet buster! Each time the TPMS sensor equipped tires are swapped out the car's ECU must relearn each sensor's unique Electronic Serial Number (ESN), another $60- $100 service charge additional to the cost of installing the seasonally correct wheels depending on the vehicle. It's not worth it in my view until the greed subsides and prices come way down. Without sensors the dash warning light will remain “on” and periodic manual tire pressure checks will be required.
Many vehicles can be put into ESN learn mode, some via a “Set” button under the dash near the steering column or in the glove box. Most Japanese makes and models, however, require a special electronic device, a US$125 ATEQ TPMS Quickset Tool.
