My locks are not currently working on my 05 S500 and I was wondering if there is any way to test the vacuum pump?? I can pop the trunk and when i press the lock or unlock button on the keypad i hear a clicking but no vac motor running. Is the vac pump bad?? Is there a relay for the pump itself that could be bad? My trunk release is also not working nor the trunk assist.(i have to open the trunk with a key) THanks for your help!!

 

hi ck for the pump on l/s trunk make sure fuse on rear fuse box is good 20 amp
if fuse is good try to reset pump by unpluging the pump if it works u need to replace the pump , remenber that new pump need to be code with das