DDM Issue?

[Hg M75]

A few years ago a couple of my door actuators were starting to getting lazy in my '04 sport, so I bought 4 new ones from Ford and replaced all 4. Recently I noticed my drivers door would unlock but not lock by the switch, the remote or the auto lock. The only way to lock the drivers door was manually push the plunger at the top of the door down. It would unlock no problem by remote, switch and by the interior door handle. Thinking I had a bum actuator in the drivers door I bought another from Ford but the problem persists. Only thing I can think of left is the drivers door module. Since the drivers door has it own relay in the module separate from the rest of the doors its my thought that the relay for the driver door gets the most use due to the two stage unlocking compared to the others. Anyone else have something similar happen? Any fixes like a resolder job for that relay?

[mustangeddie]

Had the same issue with one of mine changing the ddm fixed the problem.

[BAD MERC]

Mine does it too. All unlock, all lock except driver door. It used to be sporadic and now that it's a thing I might just chase down the bad relay and do a writeup. Or install my spare module.

[jaywish]

I have the same issue and replace the actuator last year. I guess the DDM is a generic Panther part and at least not MM specific?

[Hg M75]

BAD MERC, that would be awesome to do a write up. I'm very happy to fix things myself and this seems problematic enough based on the replies here. If you dig into it please let me know, appreciate any insight.

[mustangeddie]

I have the same issue and replace the actuator last year. I guess the DDM is a generic Panther part and at least not MM specific?

I'm pretty sure any 03 & up Crown Vic or GM are the same. Part# from one I took out of an 04 is 3W7T-13C791-AA.