On the 1st gen cars there's a way to reprogram the TPMS sensors with just the key fob. I don't know if you can do that on the 2nd gen cars, but hopefully someone else can chime in on that. It may be that you'll have to have the dealer reprogram them for you. If you have a good dealership, they'll do it for free, since it takes all of about 3 or 4 minutes; if you have a more typical dealership, they'll probably charge you 1/2 hour of labor or something ridiculous like that.What do I do in order for the computer to recognize the new wheels and pressure sensors?
Reset it for what? What size were your 18" tires, and what size are your new 20" tires?and how do I reset the computer for 20" wheels instead of 18" factory wheels and tires?
You can't reset your odometer to compensate for larger wheels/tires. You might ask you Cadillac dealer if they can reset it using their computers.What do I do in order for the computer to recognize the new wheels and pressure sensors? and how do I reset the computer for 20" wheels instead of 18" factory wheels and tires?
The self programming still works on gen 2. I used it on my 19" wheels/tires. Here is the procedure:
1.Turn the ignition to the ON position (engine off).
2.Using the key fob, press and hold lock and unlock buttons simultaneously until horn sounds, and then LF turn signal will become illuminated to indicate learn mode enabled. Or using the DIC, press and release INFO button until TIRE LEARN message is indicated on display. Hold down SET/RESET button until horn sounds, LF turn signal is illuminated to indicate learn mode enabled.
3.Starting with LF tire, increase/decrease the pressure until horn sounds.
4.After horn sounds, proceed as in step 3 for the next 3 sensors in the following order: RF, RR, LR.
5.After LR sensor has been learned, turn ignition to OFF position. Adjust all tires to pressure listed on tire placard.
OK, that's the same procedure that the 1st gen cars use. There is no need to release (or add) air continuously until the horn honks. You just need to drop or add a couple/few PSI from the tire so that the system can sense a change. So, release air from the tire for maybe 6 or 8 seconds, then stop and wait. If the horn doesn't beep after a bit (sometimes the horn honks almost immediately, other times I've had it take as long as probably 20 seconds), release air for another few seconds and then wait again.parking brake on,turn ignition to acc. hold down lock/unlock buttons together until you hear 2 horn beeps. Starting on driver side front,lower your tire psi continuously until you a hear a single honk. Then to passenger side front,again lower air until beep,then passenger rear,then driver rear. After driver rear you should hear 2 honks,tpms read honk,and a confirmation honk. your done. Turn key off,re-fill air to correct PSI. You only have 5 min to get all tires done once you start. Just did it last week on my 09 cts.
forgot to mention I had to drop mine down to around 20psi before horn honked,so be patient
Agreed, it's a ridiculous racket. The new cars @ Hendrick have "nitrogen-filled tires" as a $199 dealer add-on! :nono:Don't worry about the nitrogen. If you need more pressure just add good old fashioned compressed air. Using nitrogen in everyday passenger vehicles is a waste of money IMO.