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I can't find the PSE speed cut-out jumper.


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I can't find the sports exhaust jumper on my 03 C4 Cab. I had the PSE installed at the dealership after purchase and it seems the 4-pin jumper is in a different location than normal on my car. I know everyone says it's in position 23, but on my car the 4 pin jumper in this location is for my cabriolet top. When I pull the jumper, the top doesn't work at all. Does anyone know of an easy way of tracking down where the jumper might be located on my car? I don't really want to just start pulling jumpers willy-nilly and taking the car out for a drive to see if the exhaust is loud or quiet.

For the time being, I just pulled the relay for the exaust completely. It was in position 24 and was labeled 996 618 980 03 with the name "Abgasklappen Relais." Now I just need a way to find out where the jumper is located. Can anyone who added the PSE after purchase give me an idea of where there jumper was located?

Thanks,

Steve

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  • Admin

Sounds like your dealer/installer put the relay and socket in position 24. Look at the back of position 24 and see if the there is a gray/pink wire - that is the Speedometer A signal which triggers the relay cutout. If it is on the socket side of position 24 then you've got the right socket.

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Sounds like your dealer/installer put the relay and socket in position 24.  Look at the back of position 24 and see if the there is a gray/pink wire - that is the Speedometer A signal which triggers the relay cutout. If it is on the socket side of position 24 then you've got the right socket.

It was my understanding that the relay and socket can be in any position, but that the 4-pin jumper is supposed to be in position 23. There are no jumpers on the backside of the relay in position 24. It's just a white socket with wires on the back that go directly to the wiring harness. Position 23 is one of the black cube that you pull out from the back of the relay housing. It has no plug-ins in the front of it. It has 2 sides to it, one contains two 2-pin jumpers and the other contains one 4-pin jumper. The 4 pin jumper usually controls the 30-45mp speed cut-out for the PSE. On my car, however, it controls the cabriolet top switch.

I don't have the car here to check out the wiring that goes into the socket in position 24. If there is a gray/pink wire, would disconnecting this wire have the same effect as doing the jumper removal procedure?

Steve

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Yes, by cutting the correct gray/pink wire, you will be able to defeat the cut-out between 35-45 mph. I just completed the install except for the switch which is on order. I was able to test the system using the defroster switch.

With your situation, the dealer could have installed the relay and socket in any open area within the Relay Carrier 1 (This is what I did and is per the TSB). You need to look at the Relay Carrier 1 and look for the relay with the lanuage:

"Crede

Elektronik

Abgasklappen

Relais

996.618.980.03

1 =A

2 = 31

4 = E/A Taster

5 = LED Kontr.

6 = 15

8 = Ventil

Made in Germany"

This is the relay that comes with the electronics. It is a black relay with a white label with the writing above. None of my other relays have this writing.

Get access to the back of this relay socket and cut the gray/pink wire. Naturally, cap off the end of the cut wire with electrical tape. This will defeat the cut-out and you will not have to pull the jumper plugs.

Good luck. I hope this helps.

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  • 1 year later...

Ok... so I am clear. If you remove the relay "Abgasklappen" then it won't affect anything else other than cut the switch to silence the sports exhaust? Is this true? I pulled this relay and I can't even open this thing. Any suggestions?

FYI - I have an 04 C4S with the sports exhaust.

Thanks in advance.

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Ok... so I am clear. If you remove the relay "Abgasklappen" then it won't affect anything else other than cut the switch to silence the sports exhaust? Is this true? I pulled this relay and I can't even open this thing. Any suggestions?

FYI - I have an 04 C4S with the sports exhaust.

Thanks in advance.

Now look on the backside of the plug that you are pulling out this relay from and find a pink/grey wire. That is the one that you need to cut, or just follow it back to the jumper plug and remove it from there.

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Ok... so I am clear. If you remove the relay "Abgasklappen" then it won't affect anything else other than cut the switch to silence the sports exhaust? Is this true? I pulled this relay and I can't even open this thing. Any suggestions?

FYI - I have an 04 C4S with the sports exhaust.

Thanks in advance.

I have read a post here in renntech that if you open the relay and cut one of the diodes, it should work. It worked perfectly but sometimes, when you start the car, it automatically goes on silent mode and the only way to make it loud again is to pull the relay (while engine is running) and put it back again.

I got tired of doing this from time to time so I just completely pulled out the relay to make it loud all the time. It works perfectly so far and never had any malfunction on my car.

Loren,

Is this relay ("Abgasklappen") really just for PSE and nothing else ? Please confirm.

Thanks,

J.

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Loren,

Is this relay ("Abgasklappen") really just for PSE and nothing else ? Please confirm.

Thanks,

J.

Yes.

Depending on the age of PSE system it could be part number 996.618.980.01, 996.618.980.02 or 996.618.980.03.

So it's better off just removing the relay instead of cutting wires on the relay holder or cutting diode inside the relay, right ?

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I recently went through this whole process as well.

The most elegant though more complex solution is to add a

mini toggle switch for the speed sensor. This allows you to switch it

to the auto-cut off mode if you so desire.

I also found a very convenient location to add the mini-toggle switch:

right in an empty slot in the fuse panel. See picture below. I did have

to trim the toggle switch lever a bit for the fuse panel to fit.

I bought the mini (micro?) toggle switch at Radio Shack. Look for one with two contacts,

which makes it easier to fully recess in the empty fuse panel slot as the

slot is partiall covered at the end.

A couple notes on the PSE relay. The - 02 model has no provisions

for a manual switch over ride. For that you need the - 03 model.

By the way, solder everything, use heat shrink tubing and then friction tape

to be on the safe side. Be careful not to burn any holes...

post-1353-1135030620.jpg

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A couple notes on the PSE relay. The - 02 model has no provisions

for a manual switch over ride. For that you need the - 03 model.

What do you mean by that? 99-04 electronics are all the same. In the early 2002 factory installs of PSE the dash switch was not included, but it is an easy retrofit.

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A couple notes on the PSE relay. The - 02 model has no provisions

for a manual switch over ride. For that you need the - 03 model.

What do you mean by that? 99-04 electronics are all the same. In the early 2002 factory installs of PSE the dash switch was not included, but it is an easy retrofit.

The version of the relay (996 618 980 02) installed in my car did not have the circuitry for manual

override. I opened up the relay and sure enough, those pins are not connected. Compare

the picture below with the -03 version floating in this newsgroup somewhere. I had to buy

a new relay to make the switch work.

post-1353-1135062233_thumb.jpg

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Sure, the internals for things like relays are always being redesigned for cost reduction, reliability, parts availability, etc. But the PSE electronics circuit for the 996 has not changed, nor has the functionality of the relay. That is why you can swap out one PSE relay version for another.

I never was a big fan of cutting the diode in the relay to disable the 28-45 mph silent mode for PSE. It is much more sensible to just remove the Speedometer A signal line (the Pink/Grey wire) to the relay.

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Sure, the internals for things like relays are always being redesigned for cost reduction, reliability, parts availability, etc. But the PSE electronics circuit for the 996 has not changed, nor has the functionality of the relay. That is why you can swap out one PSE relay version for another.

I never was a big fan of cutting the diode in the relay to disable the 28-45 mph silent mode for PSE. It is much more sensible to just remove the Speedometer A signal line (the Pink/Grey wire) to the relay.

Why not just make things simple and remove the relay at all. This is the easiest way to always make the muffler open. According to Loren, the relay is just specific to the PSE and nothing else. Do you agree ?

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Sure, pulling the relay will disable the "quiet" mode all together. But many (including myself) want to be able to control the muffler, and make it quiet when wanted. To do that, the relay needs to be in place, so to avoid the speed "quiet" mode, the disconnection of the speedometer wire is necessary.

PSE sounds great most of the time, but there are other times when "silence is golden".

:D

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  • 2 years later...

I realise this is a pretty old topic (since last question/comment on this is dated 2005) but I need guidance here.

I have a C2 996 2001 with PSE installed by the previous owner (or dealer of previous owner). Looked at the wiring and everything seems in place up to the relay 996.618.680.02 in the position 14 of the relay board. (wires coming form engine compartment giong into position 14 and connected to the relay)

From there pink/grey wire is going to space # 23, brown going into space # 28 and Black/Brown going into space 11 of the same relay board. The problem is that these 3 wires are "dying" in these spaces of the relay board (no jumping wires seems to be in place). I would like to install the on/off switch but not sure on how to do this from there and what connector/jumping wire I need.

Can someone help ? Thanks

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