Door locks cycle between lock & unlock - PeachParts Mercedes-Benz Forum

dakarm34 · #1 10-08-2006, 10:40 AM

The trunk pump works, but it never stops. It locks and unlocks the doors constantly. I have disconnected it so I won't drain my battery. I also worked the key in all the locks in case the sensor was stuck with no difference.

Anyone have a clue?

Thanks, first time poster, but I love this site!
Rich

C Sean Watts · #2 10-08-2006, 10:49 AM

I would troubleshoot the electrical side of the trunk lock mechanism (resistance, continuity, flaky switch contacts etc.) Also, check out the screws that mount the air unit, loosen them slightly so that the box moves a few milimeters when it actuates, in a few rare cases this seems to work.

Samuel M. Ross · #3 10-09-2006, 01:55 AM

Quote:

Originally Posted by dakarm34

The trunk pump works, but it never stops. It locks and unlocks the doors constantly. I have disconnected it so I won't drain my battery. I also worked the key in all the locks in case the sensor was stuck with no difference.
Anyone have a clue?
Thanks, first time poster, but I love this site!Rich

You need to put the standard basic info in your signature!
See below...

greasybenz · #4 10-09-2006, 02:54 AM

well from his posts i found this.

dakarm34,'' 82 300sd turbo - 276k, in a field for 5 years!"

Samuel M. Ross · #5 10-09-2006, 04:00 PM

Quote:

Originally Posted by greasybenz

well from his posts i found this.
dakarm34,'' 82 300sd turbo - 276k, in a field for 5 years!"

So this one looks like this 1982 W126.120 Chassis came with M617.951 Engine and is a 300SD "Turbodiesel"

I just checked at: Vacuum Diagrams
and there does not appear to be a diagram for the W126 cars' door lock systems... you know the one with the electric pump in the spare tire well... the vacuum door lock system that canNOT adversely degrade the vacuum brake system if there is a major vacuum failure in the door lock system.

Q - Does anyone know where we can find such a diagram to help us diagnose and thus give "dakarm34" some help with his problem?

Sam

dakarm34 · #6 10-11-2006, 06:18 PM

I took apart the driver door to replace the window motor and mechanism, I put it all back together, and the window works great! I go for a drive and goto open the door, no dice. The mechanism moves, but evidently something behind the sheetmetal shadows is not working anymore. So I've paused my door locking/unlocking problem to focus on getting out of my car without looking ghetto.

Sorry about the missing signature, I hope I don't get kicked off this forum! I bought the car as an experiment - to test biodiesel on. I haven't made my first batch, but I'm getting my stuff ready. The car was sitting in a field for 5 years, I bought it from a co-worker who lives in Surry County. He drove it for many years, and got fed up with the stupid things breaking. The motor was rebuilt 60k miles ago, it now has 276k. There was a mouse in the trunk when I opened the spare tire lid, a snake skin in the dash, no lie! The rear window leaked so I had to gut her, power wash and odor gone the interior, it's not perfect, but it does smell better.

Thanks
Rich "RJ"
Here we go: ;-)
87 BMW 325iS - many go fast parts
90 BMW 325iS - wive's stocker - NASA Spec E30 one day
98 BMW M3/4 Dakar Yellow 4 door - pretty rare - go fast parts
01 BMW X5 4.4i Sport, fully loaded - really, I'm missing the hand that's supposed to come out
82 MB 300SD turbo - new battery, windshield, rear window seal, coolant hoses, fuel lines, all filters, all fluids, glo plugs, and many hours of fun, oh yeah - a VDO boost gauge mounted on the dash, left hand side clearing the top of the steering wheel, only 9PSI, damn it!

dakarm34 · #7 10-11-2006, 06:22 PM

Here's picks of it in the field/woods.

Thanks
Rich "RJ"
Here we go: ;-)
87 BMW 325iS - many go fast parts
90 BMW 325iS - wive's stocker - NASA Spec E30 one day
98 BMW M3/4 Dakar Yellow 4 door - pretty rare - go fast parts
01 BMW X5 4.4i Sport, fully loaded - really, I'm missing the hand that's supposed to come out
82 MB 300SD turbo - new battery, windshield, rear window seal, coolant hoses, fuel lines, all filters, all fluids, glo plugs, and many hours of fun, oh yeah - a VDO boost gauge mounted on the dash, left hand side clearing the top of the steering wheel, only 9PSI, damn it!

Samuel M. Ross · #8 10-11-2006, 07:09 PM

Quote:

Originally Posted by dakarm34

... I bought it [my car] from a co-worker who lives in Surry County.
Thanks
Rich "RJ"

... at first I thought you might a "Blimey Limey" but then I noticed you quoted the cost of your projects in USD.

Where are you from?
Regards from a half-breed "Limey"
Samuel "Millsaps" Ross!