Q: How to reset TPMS if no button is available

The only way to reset the light is to put the system in relearn mode. First, make sure all the tire pressures are even set and to specifications. You may need to hook up a battery charger on low first to keep battery from dying out. You will need to turn all accessories off. Turn the key to the "On" position with the engine off for 20 minutes and then drive the vehicle above 16 mph for at least 7 minutes. Once the relearn procedure is done, the light will go out. If the light does not go out, then you will need to have system repaired. You may have to replace tire pressure sensors since they can start to go bad after about 5 or 6 years of use.