Date registered: May 2011
Vehicle: 2005 S600
Location: Virginia Beach
Mentioned: 13 Post(s)
Quoted: 54 Post(s)
Since the other circuits work, I think you have a leak in the circuit for that door.
You said that you don’t but the computer shows that the pump runs TOO LONG on that circuit. After running too long, the pump will shut down that pneumatic circuit to protect the pump from overheating.
Pulling the pump fuse resets that protection, but the pump faults again when it runs too long and shuts down that circuit.
Until you find the leak (which you do have) this circuit won’t work correctly. Pulling the pump fuse over and over will simply cause the pump to run too long, and it will shut down again to protect it self.
The leak may be in the vacuum lines, not just in the actuator, though the actuator is common.
One final thought, given the age of the car, the pump itself may be getting weak and this one pneumatic circuit is the “canary in the coal mine”. I would check pump output pressure as well.
When you hook the car up to the computer, have your friend print out the troubleshooting steps for that fault. You need to find the leak, or determine the pump condition, and for that, the MB troubleshooting steps from STAR are the best way to proceed.
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