The trunk remote button on both master keys failed a while back. I thought the battery was low. The dealer replaced the battery on one key. The trunk release button then worked fine once, once only, but failed after then. The dealer could not solve the problem. They only suggested to replace the transponder. It may bring up the cost to reprogram or replace the master keys as well.

I took the car to the dealer and checked out the trunk remote lock. The lock switch looks and works OK.

I posted the problem but there was no solution found. As two years have gone by. Someone might figure out the solution.

Did anyone have the same issue? Suggestion will be appreciated.

Many thanks.

 

I hope necroing this thread produces a solution. I am having the same issue. New battery on one of the fobs, too.

 

Allso with same prob. have not tried to change the battery yet but general door locking works fine (y)