Removal Procedure

Insert a small coin between the two halves of the transmitter case at the slot provided near the key ring hole.
Twist the coin in order to open the case.
Open the transmitter case.

Fig 1: Opening Transmitter Case
Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to HANDLING ESD SENSITIVE PARTS NOTICE in Cautions and Notices.
Remove the battery.

Fig 2: Removing Battery
Courtesy of GENERAL MOTORS CORP.