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Papagut

Critical electrical system fault(s)

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@jagman1 thanks im gonna check that relay later today hopefully that's my problem wish me Luck 😁👍✌️ Any part numbers for that relay by any chance ?

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Part number: 955 615 027 00

Tapping on my relay box would clear the errors temporarily. This relay powers the CAN network's switched power to the many ecu's in the car.

Edited by jagman1
  • Upvote 1

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Yo Jagman thanks for the advise, mine have good wiring on it and needed the relay replacement to correct the error! I did replace with PN you mentioned. For the others that would be needing it, the relay is marked with a distinctive "433" on top of it and has a Audi/VW PN 3D0 951 253 A on it.

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Yea, it's one of those items that are almost twice the price from VW/Audi than buying it from Porsche. Funny how that happens sometimes, strange pricing.

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You bet! I'm glad it worked out. I spent 20 hours trying to figure that out. Hopefully it saved you some time.

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Had the same problems. Been driving me crazy for few days now. Thank you you guys for an awesome pointers. Would get working on the situation tomorrow.

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I have 2 ctt,s so I can swap bits to test faults. One of them for the last 6 months has been giving the same psm, abs and big red brake proportioning sign, my loom is dry, I've swapped the 433 relay by the battery, batteries fine, has 2 garages plug in obd11 ,they can't access it. Has anyone found anything else to cause this?

General things to note, I just done the valley pipes and y pieces at the back of the motor,was still ok then but then the expansion radiator bottle split so replaced that, and had welding done on rear exhaust, . Then this problem showed.

I think coincidence, and is something else?

Also there's a mobridge on the stereo and a Denison blue tooth in there too, could it be them?

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I new to this forum also so I maybe repeating things that have been previously covered.

My 2004 cayenne S is experiencing a lot of these symptoms also plus a few more, speedometer does not work when I have the brake portioning error.

I have had the brake proportioning error on and off for some time, its happening more often now. We had not driven the car for over a week and the error came back virtually on most of the time.

I have had the car since new and I have never changed the battery but I have had no reason to change as it starts first time every time with no issues.

I read that this could be a possible cause, what is your opinion on this?

I have pulled back the carpet and checked the first set of wires that were connected with electrical tape they were fine, my floor is completely dry

Your help with this would be appreciated.

 

Thanks

 

Alan

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You must let us all into the secret as to how you have managed to make a battery (Moll?) last for 14 years (-:

 

I'd change it/them.

 

 

 

 

 

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Changed the battery but the error is still there. Back to finding the corroded wires I guess.

But before I do that I will change the relay that was discussed earlier?

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Have you checked that your alternator is putting out 14.4v or thereabouts?

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I have a development to share: after nearly 10 years, this same set of symptoms suddenly returned for me: brake proportioning, PSM, ABS, speedometer - all offline + can't put it into gear. I went straight to the same place that caused me trouble all that time ago: drivers side, under the carpet, right about where the footrest is, and exposed the wiring harness. Of all the reconnections and cleaning up that it did - there it was: one small power line had become corroded and broke loose. Cleaned and reconnected, all systems immediately back up. I'm not saying that there are not other causes for this trouble, but only posting this in the hopes that I can help another member out. 

 

Here is a post-repair picture, the red lines you see looping back upward in the centre of the image - those were my culprit. The thinnest of them had come loose.  

 

Hope that this may help someone out. 

IMG_1753.JPG

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Before you go to a lot of trouble, hook up jumper cables from another automobile or charge the battery overnight and see if the extra boost allows some of the systems to come back online. If they do, then you know for sure it's your battery. Replace it. This is a common problem with the Cayenne. The battery has to be at its highest performance or this auto will let you know it with all kinds of crazy electrical gremlins and error/fault messages. This happens well before the battery is even close to dead. A strong start means nothing. If you have short commutes, hook up a battery charger on the weekend a couple times a month. Otherwise be prepared to purchase a new battery every 2 years or less. 

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