Most of car remote will not work afterfew years of use.For me it is after 6 years of use. The most probable cause is drained cell sitting inside the remote housing. In general this service work is charged a lot by the authorised car service centres. The work is very simple, only thing to be noted is the right model number of the cell. I bought it on a local watch repair shop for Rs 70 for model CR1620. It works well. Share to the intrested and needed.
Thanks.