belt "average" lifetime 240000km or lifetime of vehecile if made from EPDM (ethylene propelen dyeen monomer)
"1. unplug the bulb from its connection just give it a tug.
2. remove the rubber weather seal (sometimes it helps to use pliers to pull on the tabs) remove the outside seal first the when thats lose with your hands remove inner section of the seal.
3. look and you will see a thin metal clamp. push down on it and it will swing open leaving the bulb loose for removal.
4. remove and replace.
5. swing clamp in place and lock it in. there is a notch with a spot for the clamp to be pushed under and secured.
6. Replace rubber weather seal. outside section first, then push the inner section around the connection with your hands.
7. plug that bitch back in."