TPMS and dome light woes
Posted: Mon Nov 05, 2012 4:27 pm
This is my first post here. I purchased a 2012 AWD SLS in June and have loved every minute of it so far... well, almost.
My problem is the dreaded TPMS system. While the stock wheels are 18" I found a screaming deal on a set of virtually new Hankook Winter iPike tires mounted on 16" MB wheels with the same offset and bolt pattern. These are extremely close to the OEM overall tire diameter and the wheel size is smaller.
I took them to the local Discount Tire as they sell these units. They installed four VDO Redi-Sensors. I was disappointed to find out that Suzuki (or VDO?) doesn't support the "learnable" sensor model so I will need to have them reset each time I swap summer/winter shoes. Bummer, but c'est la vie. I drove out with the winter tires on and no issues. Everything was good for about 20 miles and then the "Service TPMS" light came on. I took it back a few days later and they found no issues but reset the sensor. Again, everything was fine for 20 miles and now the light is back on.
I'm wondering if the sensors also work off of wheel speed. From what I've read these external sensors only are tied to pressure but perhaps Suzuki has it set up different in the ECU. Since I went from the 18" to the 16" wheels they would now spin faster. Does anybody know?
The other issue I've noticed is the dome light is not working now though the switch is in the middle. It works just fine if I switch it on but no go otherwise. I'm thinking maybe some code was switched during the process of pressing the driver door switch for the TPMS reset. Anyone know this one?
Thanks for any help that can be provided. Besides this stupid TPMS system I love the car! I've put on a clear bra and 15% tint. Looks fantastic.

My problem is the dreaded TPMS system. While the stock wheels are 18" I found a screaming deal on a set of virtually new Hankook Winter iPike tires mounted on 16" MB wheels with the same offset and bolt pattern. These are extremely close to the OEM overall tire diameter and the wheel size is smaller.
I took them to the local Discount Tire as they sell these units. They installed four VDO Redi-Sensors. I was disappointed to find out that Suzuki (or VDO?) doesn't support the "learnable" sensor model so I will need to have them reset each time I swap summer/winter shoes. Bummer, but c'est la vie. I drove out with the winter tires on and no issues. Everything was good for about 20 miles and then the "Service TPMS" light came on. I took it back a few days later and they found no issues but reset the sensor. Again, everything was fine for 20 miles and now the light is back on.

I'm wondering if the sensors also work off of wheel speed. From what I've read these external sensors only are tied to pressure but perhaps Suzuki has it set up different in the ECU. Since I went from the 18" to the 16" wheels they would now spin faster. Does anybody know?
The other issue I've noticed is the dome light is not working now though the switch is in the middle. It works just fine if I switch it on but no go otherwise. I'm thinking maybe some code was switched during the process of pressing the driver door switch for the TPMS reset. Anyone know this one?
Thanks for any help that can be provided. Besides this stupid TPMS system I love the car! I've put on a clear bra and 15% tint. Looks fantastic.