My remote was doing this same thing. Once it's batteries were switched the problem disappeared. So my guess is that it takes slightly more power to lock the doors with the remote than it does to unlock them.
i cant lock the car from inside anymore, they lock/unlock button only unlocks the doors now. The doors lock as I pick up some speed (as usual). When I lock the car with the remote the car locks just fine, but the lights don't flash twice. The lights do flash when I unlock with the remote. I'm really scratching my head on this one. I checked the fuses under the hood and they are all in good clean shape.
My remote was doing this same thing. Once it's batteries were switched the problem disappeared. So my guess is that it takes slightly more power to lock the doors with the remote than it does to unlock them.
1998 c280 (WHITE)
Kenwood Excelon KDC- X579 Head
KAC iP500 Ipod Interface
2 Kenwood KCF-w3012 1500Watt 12\" Subs
Sony GTR2002 1200 Watt Amp
More Mods To Come
dude use a fuse tester, or a probe kit....you can look at a fuse all day long and visual see nothing wrong..but it could have like a hairline break. I would get a tester and see if the switch is bad or theres a wire break...its a bad wire break good luck finding it lol
Theres a demon in my car i tell yah....its name is KOMPRESSOR lmfao