Cadillac CTS 2008 Owner's Manual page 93

Battery Replacement
Replace the battery if the Replace Battery In Remote
Key message displays in the DIC. See "Replace Battery
In Remote Key" under DIC Warnings and Messages
on page 3-56 for additional information.
A weak battery may also cause the DIC to display
Electronic Key Not Detected when you try to start the
vehicle. If this happens, place the transmitter in the
center console storage area transmitter pocket with the
buttons facing to the front of the vehicle. Then, with
the vehicle in PARK (P) or NEUTRAL (N), press
the brake pedal and the ignition control knob. See
Starting the Engine on page 2-35, for additional
information about your vehicle's electronic keyless
ignition with push start. Although this will start the
vehicle, it is recommended that you replace the
transmitter battery as soon as possible.
Notice: When replacing the battery, do not touch
any of the circuitry on the transmitter. Static
from your body could damage the transmitter.
To replace the battery:
1. Separate the halves of the transmitter with a flat,
thin object inserted into the slot on the side or
back of the transmitter.
2. Remove the old battery. Do not use a metal object.
3. Insert the new battery, positive side facing down.
Replace with a CR2032 or equivalent battery.
4. Put the transmitter back together tightly.
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