[Jeff Kushner]

Guys,

I ran a search and read all the different postings about this but I'm not really sure what I'm looking for and looking at.

My alarm started going off by itself Sunday evening and it took 4 tries of lock and unlock before it didn't activate the alarm. Did the same thing lastnight then this morning, I couldn't lock it at all without setting off the alarm. Thankfully, I work at a place where locking it isn't that important however, I do want to be able to lock it tonight.

I opened the trunk and opened the panel on the righthand side and found the pump with it's reservoir but I can't seem to find the circuitboard that the guys were referencing. I've given my keys to the receptionist so she can turn the alarm off because it's now going off by itself!!

Can someone please help me? BTW-the alarm is very potent<lol>


Thanks guys,

Jeff

 

[E-Klasse]

The unit you are looking for is the PSE pump module. The circuit board is internal to the pump and at the very bottom. You have to pull the pump out and open it up to see if the board has gotton wet.

Check to see if you have any warenty left. I had mine replaced for the same symptoms you are describing.

 

[AMPM]

http://forums.mbnz.org/forums/forums/thread-view.asp?tid=1174929&posts=12

This is a very bad one.

If the damage is light it can be cleaned and put back into service.

**
Location pics
http://forums.mbnz.org/forums/forums/thread-view.asp?tid=1206992&posts=19

 

[E-Klasse]

In case one doesn't open the links.

 

[krupple]

I had this exact problem. Turns out the passenger door wasn't fully shut.

 

[Jeff Kushner]

Thanks guys...especially for the pictures and links....

It's still under facory warranty till the end of summer so I'll check the doors, maybe take a peek at the unit before taking it to the dealer. At least I know where to look if it starts going off again by itself before my neighbors turn out a posse for me to hang me for the noise<LOL>!

Jeff

 

[Jeff Kushner]

Guys,
Thankfully I had sent in the "new owner" card from the center of my owners manual when I bought the car last month and Mercedes DOES have me registered. I called the local dealer and had him run the VIN and I'm still under factory warranty till June 12th of this year....Thank God<LOL>!

Yesterday the teleaid called by itself...guess the car thought that it was being stolen<LOL>

I had slammed the passenger door and the problem went away.....or so I thought. I parked at work this morning with the doors unlocked and the alarm went off by itself around 11am so I went out, opened the truck, folded back the cover and removed the spare tire and opened the insulated case to expose the unit so the sun can dry it out.....I'm leaving the trunk open. I really dont want it going off in the middle of the night- for the entire night!

I might have missed something but I looked for a fuse to shut down the alarm and couldn't find one just for the alarm. Does anyone know of an easy way to disable the alarm so I can turn it off for a few days since my dealer appointment isn't until next tuesday?

I appreciate everyones help!!

JK

 

[Bazzle]

I dont have the MB alarm on mine.
I would check the tow away switch by turning it off when you leave the car.
Did you check the fuse panel above PSE.

Also the alarm horn is mounted in the plenum in front of windscreen. Remove plastic cover and check for a connector that may be able to be opened?

Bazzle

 

[jvhrunner]

Hey believe it or not I just had the same problem with my alarm randomly going off at night and I got called when I was at work and they said it would go off and then shut off. I checked around the PSE and found moisture around that area, I dried off around the whole area and I'm just curious as to how the water could have gotten in? It did rain really hard the last couple of days. Is my PSE totally shot? Can I some how disassemble my alarm so its not audible anymore? Thanks for the adivice. Jeremy

 

[Jeff Kushner]

Jeremy,

I dried it all out last Thursday and it rained all day Saturday and it didn't go off. I've read here that the guys say that the water travels the length of the rubber truck gasket and dumps right over the unit (PSE?)!

I've also read here that the guys out of waranty dry it out, then wrap the unit in a plastic trash bag to keep it from happening again...sounds like a fairly basic fix...although you would think that MB in thier infinite wisdom, would have solved the problem in-house by now.

As soon as I get my car back from the dealer, I'm going to check the drains and wrap the unit...warranty or not, I don't want problems that I can prevent.

JK

 

[Bazzle]

http://www.benzworld.org/forums/search/query.asp?keywords=pse&searchforumid=26&author=&days=&action=search

Have a read thru these linked posts

Jeff, was your unit wet?

Bazzle []

 

[Jeff Kushner]

Bazzle,

I can't say that it was soaking wet but the foam encased around it seemed to be damp. Thankfully, last Thursday was bright sunny and windy...perfect weather for drying something outside so I opened the foam case, emptied the trunk of such rubbish as the spare, the pumps and folded the tire cover way up underneath the rear deck then exposed the PSU(?) unit to the sunshine and left it's foam case open and in direct sunlight for about 5 hours and it really worked...not a squeek since from it. Tomorrow it goes to the dealer so one more night of not going off is all i need. I tried to trace the wires to the alarm but they've made it very, very difficult...which I guess is a good thing in order to keep our cars, ours<LOL>!!!

JK

 

[E-Klasse]

It doesn't take much wetness to short out the system. If you have warenty left, get it replaced. It is a known problem. They will replaces the unit and upgrade it to hang upside down to prevent it from happening again. Just tell them you know about the the problem and how they should fix it.

 

[jagostinojr]

i had a similar problem but mine was because water was leaking into my trunk and it shorted out my vacuum pump. i replaced it and within a week the same thing happened. i changed the location of the pump, to a safer and dryer place in my trunk.

 

[Bazzle]

jagostinojr - 4/12/2006 3:43 AM

i had a similar problem but mine was because water was leaking into my trunk and it shorted out my vacuum pump. i replaced it and within a week the same thing happened. i changed the location of the pump, to a safer and dryer place in my trunk.

OK good.

How did you move it?

Pix for all the other owners on here?

Ta Bazzle

 

[Jeff Kushner]

I'm going to post the whole reply under "for DC area people since the guy who started that thread was looking for a decent dealer....but my alarm problem was repaired at the dealer who found that the alarm, which has it's own power supply was giving low voltage codes...they replaced the entire alarm/siren unit under factory warranty and it's happy as a clam now!