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Post Info TOPIC: SL500 Mercedes Benz R230 Convertible hard top - door locks - trunk - not working opening / closing - Vacuum pump module


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SL500 Mercedes Benz R230 Convertible hard top - door locks - trunk - not working opening / closing - Vacuum pump module


Awhile back I had a customer come in with a complaint that his door locks, convertible top and soft close trunk were not working on his 2005 Mercedes Benz R230 SL500.

Upon inspection of the fuses there were none blown. I then checked out his soft close / release actuators in the trunk, which also appeared to be okay. Finally I was able to get into the computer with an updated scanner but this was of no help either.

Where I ended up was the vacuum pump. Now anyone who has worked on Mercedes knows that they use vacuum to control the door locks, and on models from 1991 and earlier this vacuum pump use to consist of a single line. Well on the newer R230's with the retractable hard top they have about 8! Not only that the pump is 3X the size and if that were not enough the damn thing retails for $1200, although we were able to find one for a mere $600 LOL.

Anyway, upon inspection of the Vaccum pump I ran straight power to the motor and found it to be working just fine, which unfortunatly means the control board is bad, which will require you to buy the engine module / vacuum pump. The vacuum pump is located in the trunk off to the left drivers side. You will need to remove the carpet and foam to access the hydrolic pump that runs the retractible hard top pump. Once you have access to the hydrolic pump you will need to remove the four bolts that holds that down. Under that you will find another foam panel, and then finally the Vacuum pump and module. Be sure not to disconnect any of the hydrolic lines to the pump for the retractible top as you can just move it to the side.

Okay, now that you seen enough photos of the car so you know its the same as yours, start by checking the fuses. They are located in the rear passengers side glove box.

Open the glove box and remove the panel. You can hardly tell it's there, but it is.

Check all these fuses. If they are all okay then it's a good chance your vacuum module is shot.

Go to the trunk. Open it. You should have a small key in the transponder (door lock key fob) use this to open the trunk manually. Pull all the carpet out until you see the spare tire like above.

Pull the foam out on the left driver side to expose the hydrolic pump for the retractable hard top. THIS IS NOT THE VACCUM PUMP. DON'T REMOVE THE LINES! Just the 4 nuts that hold the bracket down.

When the nuts are removed GENTLY slide the pump over. You will then have to remove more foam/sound proofing to gain access to the vacuum pump module.

See all them yellow lines? Them are the vaccum lines and they are attached to the vacuum pump. Dont do what I did and remove all the lines one by one, rather the grey plastic part is removable and will come off with all the lines in tact, this makes re-install WAY easier, but lucky for me I took pictures before removing them so I was able to get them back in the right spot. With the lines removed, disconnect the wires, there should be two bulk heads. Remove the pump, take apart and run power (12 V) to the pump. If the pump spins you know the board is shot. Bend over and take it in the can for at least $600 but WTF you own a $140,000 car so that should be nothing.

Now, send me a nice fat tip for helping you save $2000 which the delalership would have charged you. LOL Just kidding... Well maybe not, but at least a "Hey thanks that fixed my car" would be nice.



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State of Michigan Certified Master Auto Mechanic +2

Specialty Certified Since 1994



IN THE RUNNING

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RE: SL500 Mercedes Benz R230 Convertible hard top - door locks - trunk - not working opening / closing - Vacuum pump mod


LOL,

Great thread SELLC ! Now all I need is 140 K to grab an SL & then wait for the problems to start !

Rastus

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Thanks for the concise instructions. Are you saying that the door locks and the retractable top are both run by the same vacuum pump? I.E. my door locks work fine, but the top will not fully open. The trunk lid opens up, the roof appears to unlatch, but that's as far as it gets. The hydraulics seem to be whirling away. Could it still be the pump? Or some other issue I should be looking at. My apologies for the year old thread bump. 



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OUT-OF-HAND

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Your issue sounds more pump related. Usually when this part goes bad you wont have any noise at all. The power door locks will not work, nor will the soft touch / auto trunk button.

I didn't get into the pump, but I'd imagine that's where you will have to start.



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State of Michigan Certified Master Auto Mechanic +2

Specialty Certified Since 1994

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