2008 CADILLAC SRX keyless entry remote must be programmed to your vehicle before it will work for you. Programming can only be done at an automotive locksmith shop or the dealership with the vehicle present. There are no onboard programming instructions available for 2008 CADILLAC SRX remote. This keyless entry remote comes with Brand new battery and is tested for functionality before sending. The numbers on the back of your remote should read 25839476, and have 5 buttons with remote start.