How do I program a new RKE transmitter if I have two already-recognized transmitters?
With the vehicle off, place the two recognized transmitters in the transmitter pocket, then insert the vehicle key of the new transmitter into the key lock cylinder on the outside of the driver door and turn it to the unlock position five times within 10 seconds. The DIC will display READY FOR REMOTE #2, 3, 4, Etc. Place the new transmitter in the transmitter pocket and press ENGINE START/STOP until it is learned, then remove the transmitter and press K or Q. When finished programming all transmitters, press and hold ENGINE START/STOP for 12 seconds to exit programming mode. (Page 14)
From the official Chevrolet Trailblazer manual, page 14
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