There are always caveats.:thumbs:
The BCM (Body control module) on the H3 is only capable of reading four TP sensors.
Now, from memory...
First year (2006) H3s were equipped from the factory with five sensors, one in each tire, a year or two later (can't remember exactly either 2007 or 2008) the H3 was to be only equipped with four sensors; installed in the tires at the four corners. It was a cost saving for GM (I won't say anymore on that subject), but also a fact that the spare tire, although considered totally safe for travel use was, what GM tire and wheel, considered a class B tire while the four on the ground were class A. And the recommendation to include the spare into the standard rotation was supposed to have been removed from the owners manual. (Not sure what the difference was between Class A and B; however, it was totally safe to drive on, as determined by GM's tire and wheel engineering department. I'll also add the close to 90 percent of Federal tire regulations can from GM's tire and wheel engineering group, so they did know their business.)
Done with history.
Now some facts from this old mind....
The BCM (on the H3) is capable of reading only four sensors and it does not read sensors as to location (like most newer vehicles or the more expensive vehicles back in those days). So if a tire in one corner goes low, it just says you have a low tire, it is up to you to determine the low tire.
Since the BCM only reads four sensors and does not show location, if you rotate the four tires on the ground you do not need to do a relearn of the sensors to the BCM. However, if you included the spare, a relearn was required cause the old spare, now on the ground would not be monitored, while the new spare (an old corner tire) will remain to be read by the BCM. A relearn will allow the BCM to learn all four tires on the ground including the new (old spare) and disregard the new spare. (At the time the relearn procedure is started, the computer deletes all four sensors from memory.)
Now, if you have a later model that had no sensor in the spare and it was used in rotation, if a person tried a relearn with the four tires at the corners, the computer could not complete the relearn cause it only sees three tires and is waiting for the fourth. (Remember the BCM resets the sensor IDs.) If you use the spare in rotation and DID NOT try a relearn the BCM would be happy cause it is still reading the four sensors (three on the ground/spare.)
On my 2006 H3, I rotated all five tires, and did the relearn. When I had my 2008, I only rotated the four on the ground, never did a relearn, and went from factory to Cooper STTs and then from Cooper STTs to Dunlop Fierce Attitude tires and never did a relearn. Just made sure the tire dealer marked the spare so it would always be a spare when I sent to the Cooper, and kept the Cooper spare when I went to the Dunlops.
I never