Need help guys, yesterday I opened my trunk... because I noticed that my rear markers or whatever you call them, that comes up to guide you when you put the car in reverse were stuck up. So when I went to shut the trunk, and the trunk wont shut at all. Not manually or anything.

So I'm in a rush and I have to TAPE the trunk shut so i can go to work.

Anyways I took a look at it today, and I check the fuse box in the trunk, it seems one of the fuses were blown, ok so I change it and I heard some noises and bam the trunk will shut. Perfect.... well later on tonight I come back from a store and hit my remote to unlock my doors, the light turns green but NONE of the doors unlock, so I was able to manually unlock the passenger side thank god.


So I open the trunk to check if a fuse is bad, nope nothing that I notice. But my trunk wont shut again. I checked that fuse that was blown out but its fine... So now I cant manually lock my doors ( at least not the drivers side door lock) and my trunk wont latch... I do hear some vacum and some other noise when I push the latch inside the trunk in t he lock position.


What should I check/ do? I have no idea what to do and I cant go around with my trunk taped up.


By the way its a 1992 sel 600.


Thanks.

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1992 SEL 600..... 143,000 miles

Does the truck flap go in or out?
Do the reversing aid's go up or down?
Do the rear headrests fold down when you push the button on the consol?
Does the lumbar inflate on the drivers and passengers seats?

Give me more details, and I'll try to help you, I had the similar issue. 1992 400SE.

I read your post leading up to your purchase in Nov '06, and I hope you're enjoying your 600SEL. I bought my W140 around the same time, althought it wasn't my first Benz, and definetly won't be my last. My selection of the 1992 400SE was due to less simplicity (No Hydralic Rear Suspension, No ASR, No Rear Power Seats, and No Rear Heat/A/C Controls). Also I wanted more power than the V6, but unfortunatly Premium gas is $3.50 / galon, so that stoped me from goin to 500 or 600. Before purchase, the vehicle had the wiring harness replaced, new A/C Compressor and Evaporator ($$$), new radiator (been in small front accident), and had the two tone paint (Black w/ Gray Pannels) repainted to Black (Looks much better).

Knowing that a few costly fixes were already taken care of I got excited, and bought it. But little problems will always arrise and sometimes are fun to tackle on your own.

SOrry I havent updated this, but the initial problem was the trunk latch droped a little lower and wouldnt catch. I took it to the shop I go to and he was able to raise the latch a little and I can close it manually.

My problem now is that I can't lock or unlock my doors with the remote I checked the battery and its not that. I'm thinking it's the central locking system?? Whats really weird is that I can't unlock the drivers door with the key but I can manually unlock and lock all over doors.

Still cant figure this problem out.

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1992 SEL 600..... 143,000 miles

The problem with your trunk latch should not have required adjustment of the catch mechanism. With the failure of the PSE pump, the latching pawl (in the trunk lid) isn't extending far enough to engage the catch. This is especially true if you use the manual levers in the trunk lid to retract the pawl. When this is done, you really have to slam the trunk lid to get it to latch.

In the way of a short explanation - the trunk lid close assist is powered by the same pump that handles pulling the doors shut. However, it works in cooperation with the PSE pump to extend the latch pawl when you open the trunk - this is to allow a quicker "set for close" process, since the pawl needs to be extended fully to allow an easy catch by the latch mechanism. When the PSE pump fails, the pawl never gets fully extended.

The same pump works the parking masts, the trunk lift handle, the door locks, the orthopedic lumbar supports (since yours is a 600SEL) part of the trunk pull-down circuits and several other items.

If the doors unlock with a key, but not with the remote (or with the button on the driver's door), and if the parking masts stay up and the trunk lift handle stays out etc etc etc.

The PSE pump (under the passenger-side rear seat cushion) is having issues. You've already checked the fuses. Likely the pump has gone to the happy hunting grounds.

When you try to unlock the driver's door with the key, what happens - does the lock knob extend and then immediately retract? Or can you not turn the key? Or can you turn the key and nothing happens?

Hey thanks again to responding brian. Actally what i thought was very weird was that latch problem at the same time as the pump problem. Must be a huge coincidence.

But when i hit the remote to lock or unlock doors nothing happens. Just the red and green light go on when hitting the remote.

When putting my key into the passenger door I can unlock and lock it with the key, but putting it in the drivers side door, i unlock it nothing happens, I lock it nothing happens. The latch doesnt move at all. NOt sure why though?

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1992 SEL 600..... 143,000 miles

Just a thought - you do know that you can't lock the driver's door with the door open, right? The door must be closed and latched to allow the key to turn in the lock.

Let's get the door lock system back up and running before we figure out what the problem is with the driver's door lock.

To see if the PSE pump is toast, pull the fuse for the pump for about 30 seconds and plug it back in. Then lock the doors or adjust the lumbar supports or something that should cause the pump to run. Listen for the pump - it's easily audible if the car is not running (and from your other post, I assume that is a given).

You should consider purchasing or building a code reader for this car. It's the same year as mine and the code reader will allow you to diagnose problems with most all of the systems on your car.

For instance, I had some issues with the door lock mechanisms. The driver-side rear door would sometimes fail to unlock with the other doors. Plugging my trusty code reader into the port for the PSE system returned a "central locking system, air demand too high" error code. A little more testing revealed a leak in the lock actuator on that door. The PSE pump uses air pressure to move the actuator towards the unlock position. It uses vaccuum in the same circuit to lock the doors. There was a broken tab on the driver's side rear door actuator that allowed it to leak air under pressure (the unlock cycle), but vaccuum in the circuit (lock cycle) wasn't a problem, as the vaccuum pulls the actuator tighter together instead of trying to push it apart.

I ended up changing all of the actuators while I had the car wide open for other issues - but the little test lamp was invaluable.

BTW - what kind of horrific gas mileage do you get from that V12? I just paid $3.12 for premium last night and I get about 17.5 around town. I'm sure we'll see close to $4/gallon before summer's end here in Texas - maybe you Californian's will see $5?

I didnt know for a while that you couldnt lock or unlock the door with it open. But I figured that out about a month or so ago. But that didnt have any affect on my problem.

I also did that fuse trick back then, I took it out. Put it bacck in a few mins i heard something power up which I assume was the pump. But still no luck. I did the fuse thing a few times just in case but nothing also.

So Im sure I'm going to have to have my mechanic take a look at it.

Oh and last time I put gas in I payed 3.79 a gallon I live in san francisco and it's expensive. I probably get 10-12 miles to the gallon depending on the traffic here. pretty bad but o well

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1992 SEL 600..... 143,000 miles