88 300E central locking

The alarm system arms when I lock the passenger door but the other doors do not lock. Where do you suggest I begin? I have a schematic but it appears that the wiring from the passenger door switch is intact since the system arms.

The central locking system operates properly when I lock the drivers door or the trunk(all vacuum actuated locks reposition and the alarm arms)

[jeffsr]

Start in the passenger door. The vacuum actuator is not working. The alarm arms because it is not actuated by the vacuum circuit. Uses a microswitch on the lock mechanism. You might also check the vacuum line where it passes from the body to the door. Constant flexing there..

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE

[toddlaroche]

Do you need to remove the door panel to get to the vacumm actuator? I think my driver's side door vacumm actuator must be faulty. The driver's side lock, when turned, doesn't activate the central locking system. The trunk and passenger-side locks do just fine. Is replacing the vacumm actuator easy?

[ejsharp]

Years ago I tore the insides of my 87 300E apart. Had the seats, door panels, and whatever else I could remove out of the car and distributed across my lawn.

I finnaly found the culpret. It was a corroded wiring connector for the locking system located under the carpet and rubber subfloor where the right rear passenger would place their feet... about a foot and a half forward of the vacume pump.

So make sure you have current going to the parts before replacing them.