also try this... take the cover off the battery and see how may digits are on the "key head marking"
If it has 5 or 7 digits, it needs to be programmed with diagnostic equipment at a main dealer.
If it has 8 digits, the following will work:
Ensure ignition switched OFF. Press vehicle central door locking button for more than 5 seconds.
NOTE: Doors should lock then unlock.
Carry out the following within 10-15 seconds: Press first key lock/unlock button twice (once on some models). Press second key lock/unlock button twice (once on some models).
NOTE: Doors will lock or unlock.
The number of digits determine the type of remote control you have
Key head marking:
5 characters - Infrared
7 characters - Infrared
8 characters - Transponder and infrared or radio frequency
None - Transponder and radio frequency