Resurrecting this from the dead. I have a similar scenario, but I'm not sure.
I have an '06 GXP, I run 18X8 alcoas with stock 255's all around in the summer and 18X7 alcoas withi stock 225's in the winter.
I recently put my 18X8's on and noticed my drivers side front getting lower. But my DIC never warned me, etc. Now when I go to the DIC and try to reset the TPS nothing happens. I hold it and it just goes back to my day/date screen.
I'm looking at the owners manual right now and in section 3-55 it says "Press the set/reset to reset the tire inflation monitor system. The message, TIRE INFLATION HAS BEEN SET, will appear on the screen if the Check Tire Pressure message, indicating an irregularity in the pressure of one of the tires, had previously appeared on the DIC. If the Check Tire Pressure message did not appear and the set/reset button is pressed, teh system will reset, but no acknowledgement message will appear on the screen".
So the way I'm reading this is this is that the system is truly resetting, but it's not saying it was because the DIC never told me there was a tire low.
But why didn't the DIC tell me (my tire was at like 18 lbs)? Somewhere in the manual it says that the DIC will only go off if one tire is more than 12 lbs lower.
I want to reset my DIC and have the computer tell me it's been reset, but I can't get it to. Am I missing something?
Just so I get this out there, I'm not real knowledgeable about working on cars. This may seem like a dumb question to some because it's your common knowledge. Unfortuntely, it's not for me.

:th_wtf:
Any help is appreciated.