2002 Chevrolet TrailBlazer Owner's Manual - Page 82

To replace the battery in the remote keyless entry transmitter do the following: Liftgate/Liftglass CAUTION: It can be dangerous to drive with the liftgate or liftglass open because carbon monoxide (CO) gas can come into your vehicle. You can't see or smell CO. It can cause unconsciousness and even death. If you must drive with the liftgate or liftglass open or if electrical wiring or other cable connections must pass through the seal between the body and the liftgate or liftglass: D Make sure all other windows are shut. D Turn the fan on your heating or cooling system to its highest speed with the setting on panel or bi-level with recirculation off. That will force outside air into your vehicle. See "Comfort Controls" in the Index. D If you have air outlets on or under the instrument panel, open them all the way. See "Engine Exhaust" in the Index. 1. Insert a thin coin in the slot between the covers of the transmitter housing. Gently pry the transmitter apart. 2. Remove and replace the battery with a three-volt CR2032 or equivalent battery, positive (+) side down. 3. Align the covers and snap them together. 4. Check the operation of the transmitter. 2-13