Hello my name is XXXXX XXXXX i will do my best to help you.
as far as the steering wheel controls the lighting inside the buttons are led"s and once they go the only way to fix is to replace the buttons. they are available seperatly i belive instead of having to buy the whole steeing wheel and such.
as for the seat heater the clicking your hearing is the relay so that tells me that the power supply is probably godd and your seat heating pad is faulty. you will need to remove the seat and replace the pad under the covers. if you never done this kind of work before its best left to someone that is very familiar with upholstry because its a very time consuming tedious job.
Please click ACCEPT if i have been helpful and let me know if i can be of anymore assistance
positive feedback and BONUSES are GREATLY APPRECIATED,THANKS,Lou