Chevrolet Suburban 2007 Owner's Manual page 118

Battery Replacement
Under normal use, the battery in your RKE
transmitter should last about four years.
You can tell the battery is weak if the transmitter
will not work at the normal range in any location. If
you have to get close to your vehicle before the
transmitter works, it is probably time to change the
battery.
The REPLACE BATTERY IN REMOTE KEY
message in the vehicle's DIC will display if the
RKE transmitter battery is low. See "REPLACE
BATTERY IN REMOTE KEY" under DIC Warnings
and Messages on page 266 for additional
information.
Notice: When replacing the battery, use care
not to touch any of the circuitry. Static
from your body transferred to these surfaces
may damage the transmitter.
118
To replace the battery in the RKE transmitter do
the following:
1. Insert a flat object with a thin edge into the
notch on the side of the transmitter and
separate the bottom half from the top half.
2. Remove the old battery, but do not use a
metal object to do this.
3. Slide the new battery into the transmitter with
the positive side of the battery facing down.
Use a type CR2032 battery, or equivalent
type. Make sure the cover is on tightly,
so water will not get in.