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Old 10-03-2004, 10:12 AM   #1 (permalink)
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Date registered: Sep 2004
Vehicle: 1994 S420
Location: los angeles, ca
Posts: 184
Reverse antena sensors-won't go down!

My reverse antena sensors will not go down into place. I have checked them and don't seem to understand why. They were working before but from one day to another they justed stayed up. If any one can give some info. on how to solve the problem, it is "GREATLY" appreciated.
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Old 10-03-2004, 04:22 PM   #2 (permalink)
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Date registered: Sep 2004
Vehicle: 1994 S420
Location: los angeles, ca
Posts: 184
RE: Reverse antena sensors-won't go down!

Now i cant even open my trunk....man what a mess!
I have a 94 S420.
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Old 10-03-2004, 05:53 PM   #3 (permalink)
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Date registered: Dec 2002
Vehicle: 92 500SEL -01 E320T
Location: Florida
Posts: 2,225
RE: Reverse antena sensors-won't go down!

The pump that controls those is under ther the passenger rear seat, pray, pull the fuses and hope it is reettable if not is the pump, few hundred like 5
this pump controls the rods , lumbare, ac assist, and some headrests, plus locking, Do a search
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Old 10-04-2004, 04:16 PM   #4 (permalink)
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Date registered: Sep 2004
Posts: 46
RE: Reverse antena sensors-won't go down!

Quote:
Peter Guenther - 10/3/2004 7:53 PM

The pump that controls those is under ther the passenger rear seat, pray, pull the fuses and hope it is reettable if not is the pump, few hundred like 5
this pump controls the rods , lumbare, ac assist, and some headrests, plus locking, Do a search
I have a 94 S and on my car the backup antennas are electric.There has to be some switch that activates them when you put the car in reverse. check around transmission and at antennas themselves.

Try using your key to open trunk
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Old 10-05-2004, 08:31 AM   #5 (permalink)
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Date registered: May 2004
Vehicle: '95 S320
Location: Northeast U.S.
Posts: 49
RE: Reverse antena sensors-won't go down!

I recently did some trouble-shooting on my vacuum system and I can tell you the backup rods, gas door lock, trunk release, trunk lid handle, lumbar, door locks were all controlled via the pump. To raise the backup rods, the pump has to blow pressure to the rods. To lower the rods, the pump has to create vacuum by sucking the rods back down. If you have a leak in the system, it will prevent different items from functioning. In my case, the trunk lid handle wasn't extending when the trunk was open. I could hear a whinning noise for about 10 - 20 seconds after the trunk was opened that was the pump trying to push the lid handle out. After a period of time, the pump circuit gives up if it can't perform the action. It turned out that the gas door lock diaphram had developed a leak. I replaced the diaphram and it solved my problem.

Your problem may be a faulty part in the system (maybe even the pump) or a leaking, loose, or disconnected hose. If other things like the door locks and lumbar still work, then it is probably not the pump but another part in the system.
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Old 10-06-2004, 04:34 AM   #6 (permalink)
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RE: Reverse antena sensors-won't go down!

Quote:
I have a 94 S and on my car the backup antennas are electric
there's no such thing.

all are pneumatic.
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Old 10-06-2004, 07:04 PM   #7 (permalink)
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Date registered: Sep 2004
Vehicle: 1994 S420
Location: los angeles, ca
Posts: 184
RE: Reverse antena sensors-won't go down!

Thankx to all of you, you have been much help. I took the car in to a place here called mbz motors, all they do is work on mercedes, they checked out the problem and it it definetly the pump that is located under the rear passanger seat. Just so you guys will know if one day your pump gose out it's $ 700.00 just for the fu@#n pump......oh well....again thankx for the info....much help
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Old 10-06-2004, 07:12 PM   #8 (permalink)
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RE: Reverse antena sensors-won't go down!

fact is:

it was just the motor carbon brush inside the pump that's worn out.
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Old 10-10-2004, 08:11 AM   #9 (permalink)
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Date registered: Aug 2002
Vehicle: e320
Location: kitchener, ontario,canada
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RE: Reverse antena sensors-won't go down!

Wildponey:

Have you discarded the old unit? I'm looking for internal parts and was wondering if you were interested in shipping it to me?

Ron
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Old 10-11-2004, 11:00 PM   #10 (permalink)
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Date registered: Sep 2004
Vehicle: 1994 S420
Location: los angeles, ca
Posts: 184
RE: Reverse antena sensors-won't go down!

so sorry, today was trash day and you know the rest of the story........it's gone!........well thankx for asking[:(]
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