Open the keyless remote and you will see the battery take it out and replace it with the same size.
Cut open the remote with xacto knife , unsolder and replace the battery.
Split the remote open at the key fob loop.
Most keyless remotes just snap together. Look closely for a small notch in the seam of the remote. A regular watch style battery is inside.
You do not have to reset the keyless remote after battery replacement.
Your keyless remote might not work for your 2002 Chevy Tahoe because the battery in the remote is dead. You can replace this battery by prying the remote cover off of the back of the remote or by removing the screws holding the cover closed.
it seems you cant , seald unit
I was informed by a BMW dealer there isn't a battery to replace and you have to order a new remote and then have it programmed by the dealer.
Pretty simple, open the remote...most likely just snaps apart, replace with same part number battery
im guessing that your talking about the alarm/keyless remote. You will find that you have to get closer and closer to the car to be able to unlock it. You should replace the battery when you have to be within about 10ft from the car.
I took mine to radio shack and they did it for me! I've heard not to try and do it yourself
First guess; the battery is dead. If you replace the battery and that doesn't solve the problem, you may need to have the dealer reprogram the remote for your lock code.