banker49

My E320 - 2001 My door locks are not working. My remote will activate the alarm, but the locking mechanism either stays locked or it stays unlocked. Also the trunk is locked and will not open with the remote and will not open inside the car. The rear head rests will not release either. I checked the fuses (41, 5, 19) and the fuses were in good shape. I'm stumbed. What else can it be? A relay? Any insight?

Thanks,

raymond g-

same insights i gave on the other forum. sounds almost like classic case
of water intrusion affecting the electrics and PSE module. eliminate that first
before moving to other guesses

dsmith

fyi, all of those items are controlled by the PSE pump/vacuum system.

banker49

I checked the fuses. All signs point to the PSE pump. Is there a fix or direction to correcting the PSE short of purchasing a new pump?

Musikmann

Try cleaning or drying it out. If it was fried it probably would have blown some fuses or tripped a relay.

raymond g-

used PSE unit will cost you $200+, or $500+ from the dealer. either way,
the car must be recoded to introduce it to the new PSE using the Star
Diagnosis System.

banker49

Raymond,

Not the outcome I was hoping to hear, but it is what it is. Thank you for sharing your knowledge. I really enjoy my car and like learning from experts and other enthusists like yourself and others that have posts.

Plutoe

The other equally important point is that there are loads of "hawkers of PSE pumps"on the internet.

Another issue is make sure that the pump you buy is interchangeable with the PSE pump for your car as there are numerous variations of pumps depending on model and functions.

The bad news is that you buy and install a pump that can not be version coded to you car. Then you become a new "hawker of PSE pumps.

Check EPC for your pump number then before you buy get the pump number and do a part search in EPC if your model comes up that's good, if it doesn't keep looking.

The pumps are not cheap therefore be watchful.

raymond g-

very sound advice from plutoe

mbon99e300

I have same difficulty with my 99 E300. Don't know the term PSE and where it might be located.

raymond g-

mbo...

Pneumatic Systems Equipment (pump)

you can see this under the rear seat recess next to battery. has plumb-age
leading into it to operate vacuum assisted appliances.

boltonblue

BTW, is there a special secret to changing one of the air lines?
I'm a little reluctant to force them, I don't know the breaking strength of the connectors.
I need to disconnect and reconnect for my door swap.

raymond g-

yes, it can be tricky. check Roman numeral IV....

Fabio D

Is pretty common find water inside the PSE unit, i see some cases here.. But someone know were the water comes??? i check all the car for water incomming & nothing. but the units are completly rusted and wet

Fabio Daniel

wnobles111

My '02 was leaking from the seam under the trim strips on the roof. Had to replace my PSE because, unbeknownst to me, water collected in the battery compartment and the foam surrounding the PSE wicked it up into the unit causing it to fail.