Vacuum pump wiring diagram? - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 03-20-2009, 12:57 PM Thread Starter
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Vacuum pump wiring diagram?

Hey guys i'm looking for the wiring diagram for the vacuum pump under the rear seat.

This should be the pump that controls the central locking system.

Every single wire running to the pump has been cut and connected with electrical tape. It's awful. The wires coming out of the pump's harness are all red...then they are all connected to standard MB wires with electrical tape. So if someone has the wiring diagram for that section of the car with the wire colors and such, that would be a huge help.

In other news. I rewired the bose amp back to life. Yet another hack wiring job to make a shitty CD player work on the factory speakers. I got the correct harness, and then rewired the entire harness at the amp. someone just cut all the wires and spliced into them.
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post #2 of 13 (permalink) Old 03-20-2009, 04:48 PM
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Quote:
Originally Posted by bazookatooth View Post
Hey guys i'm looking for the wiring diagram for the vacuum pump under the rear seat.

This should be the pump that controls the central locking system.

Every single wire running to the pump has been cut and connected with electrical tape. It's awful. The wires coming out of the pump's harness are all red...then they are all connected to standard MB wires with electrical tape. So if someone has the wiring diagram for that section of the car with the wire colors and such, that would be a huge help.

In other news. I rewired the bose amp back to life. Yet another hack wiring job to make a shitty CD player work on the factory speakers. I got the correct harness, and then rewired the entire harness at the amp. someone just cut all the wires and spliced into them.
If you have alldatadiy.com... will be more than happy to guide you to the diagram for this PSE or send an email to deutschland.mechanix@me.com and one of our team will be happy to email some diagrams for an assistance... may take a couple of days, but will be glad to help. alldatadiy.com has all of the information that our shop WIS and STAR systems also have.

Dutch

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post #3 of 13 (permalink) Old 03-20-2009, 05:56 PM
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Post Diagrams... A37: PSE partial data

Quote:
Originally Posted by bazookatooth View Post
Hey guys i'm looking for the wiring diagram for the vacuum pump under the rear seat.

This should be the pump that controls the central locking system.

Every single wire running to the pump has been cut and connected with electrical tape. It's awful. The wires coming out of the pump's harness are all red...then they are all connected to standard MB wires with electrical tape. So if someone has the wiring diagram for that section of the car with the wire colors and such, that would be a huge help.

In other news. I rewired the bose amp back to life. Yet another hack wiring job to make a shitty CD player work on the factory speakers. I got the correct harness, and then rewired the entire harness at the amp. someone just cut all the wires and spliced into them.
Partial electrical diagram connector information for PSE (A37 on diagram's)

This will get you started... note wire color abrv. and connector numbers, etc.

Robert
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post #4 of 13 (permalink) Old 03-21-2009, 08:01 AM Thread Starter
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wow, thanks a ton. I'll need to buy alldata. seems very usefull
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post #5 of 13 (permalink) Old 03-05-2014, 04:29 PM
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Quote:
Originally Posted by bazookatooth View Post
Hey guys i'm looking for the wiring diagram for the vacuum pump under the rear seat.
I think that the diagram for the external connections to the PSE control unit (A37) shown on post #3 is correct, but is too small to be legible.

I have saved this drawing from my WIS on a pdf, which can be readily enlarged to enable the details to be read. Page 4 is from another system that is also connected to A37.

The wires have 2 (or 3) colored stripes, which are abbreviated in English as: RD=red, GN=green, BL=blue, BK=black, YE=yellow, GY=gray, WH=white, BN=brown, PK=pink.

The pins on the circuit diagram are all shown on connector 1. (is there another?)

pin 7 is shown to cct 30. This is unswitched battery voltage. Fused at F4 fuse f11, 20A.
pin 4 is shown to cct 15. This is +12v dc with Ig switch in posn 3 (i.e. Ignition ON) Fused at F4 fuse f3, 20A.
pin 21 is shown to cct 31. This brown wire always goes to chassis earth.

Have the fuses been checked?
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File Type: pdf W140 PSE external cct.pdf (753.7 KB, 436 views)
aydin420 and nathanD.rector like this.
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post #6 of 13 (permalink) Old 05-16-2015, 11:52 AM
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Hello,

I found this old post and it has been most helpful. I do have a quick question for those more knowledgable:

I bought a '97 s500 and the "IDIOT" who fashioned himself a Mercedes mechanic decided because the pump did not work he should cut all of the wires to remove the pump. Then he tried to EBAY a new pump (which was wrong) and new harness ends. I got the mess, once I discovered my bad in not looking under the passenger seat pre-purchase. I have redone the engine, transmission, rear SLS, front suspension, all window mechanisms, and now am left to last job of PSE.

My wiring does not quite match what is in this PDF. I am stuck on the final few wires. I have matched up what I could find. I have two yellows and two greens left over. Also which Blue and black goes to which? Do I have to run a continuity check from the original N/57 and N/54? Is there an easier way? Also I am confused about the (refer to pdf) Pin 1 - 15- 8 I see that they should have two wires connected to one pin, extra yellow on 15 and extra green on 1, but what color are the other wires?
I see in the box BUBK / BUYE / and YE in dotted box 97 and GN YE BNYE in dotted box 98. I don't wont to wire the thing wrong and blow out the new pump again.

Any help would be much appreciated.

Brent
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post #7 of 13 (permalink) Old 05-16-2015, 02:17 PM
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You did not find the REAL post on these pumps...Post 35 should help

http://www.benzworld.org/forums/w140...upid-pump.html

For your year if you have a coupe the pump looks like the 94-96, but a sedan the pump will look like a 98-99 pump..

I fix alot of these pumps, and the one in the picture is the one for the later cars with the grey plate and all the yellow lines go there.

Here is the flavors of the pumps, yet the last one is to a w210:

http://www.benzworld.org/forums/w140...ml#post9439178

Martin



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post #8 of 13 (permalink) Old 05-18-2015, 11:35 AM
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Martin,

Thanks for the prompt reply. I did actually use the post 35 you referenced for my wiring. PSE +1997 W140. That is where my question comes in. I have a few extra wires on both ends. I am attaching pictures to better understand what I am saying.

MY pump is the correct one, with 6 outlets and the 5 are used. (rear back ups are not present and nipple is capped.)

MY question is in the diagram of 1997+ where the 97 and 98 connect to 1 and 5. What color are these supposed to be?

Also is there a way to fix the melted plastic between nipples, i.e. the pump ran got the plastic too hot thus melting the top of the PSE? I have a w220 pump

I will attach more pictures as I progress...

Thanks in advance for your help!

Also for posterity if anyone is reading this and is as confused as I was for the vacuum diagram here goes for central locking. P+ P- SFG FKS etc.

Brent

TexasMercedes
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post #9 of 13 (permalink) Old 05-18-2015, 11:54 AM
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Also here is a specific item on wiring I am lost about. Define circled parts colors...
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File Type: pdf PSE_+1997 W140.pdf (262.8 KB, 52 views)
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post #10 of 13 (permalink) Old 05-18-2015, 02:29 PM
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Quote:
Originally Posted by TexasMercedes View Post
MY question is in the diagram of 1997+ where the 97 and 98 connect to 1 and 5. What color are these supposed to be?
I'm trying to follow this thread (with difficulty!) and have a couple of questions.

1) Have you established if your car follows the 'up to 97' or the 'from 98' design?
2) In your sentence above you meant to type pins 1 & 15, I think.

The way I would expect the circuit diagram above to work (trying to cover 2 different designs) is this - assuming the 'up to 97' design.

3) The 'unambiguous' wiring is shown connected from end to end. That is:

A37 Conn 1 pin16 to N57 pin16. (blue/yellow wire)
A37 Conn 1 pin 2 to N54/1pin 3. (blue/black wire)

That leaves 3 wires from the 97 box to find a destination. I would assume these go (in sequence inside the bracket) to A37 pins 1, 15, 8 as follows:

A37 Conn 1 pin 1 to N57 pin 20. (blue/black wire)
A37 Conn 1 pin 15 to N54/1 pin 4 (blue/yellow wire)
A37 Conn 1 pin 8 to Y65/3 pin 1 (yellow wire)

Now you have 2 blue/black wires and 2 blue yellow wires to separate out. If this post makes sense so far, we can pursue that problem later.
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