Cayenne Tiptronic rocker switches (buttons) not working

[paulwu]

Hi,I have a MY04 Cayenne-S. The tiptronic switches was working fine since got the car; today not working after back from dealer by doing a TCU (transmission control unit) adaptation coding. But ending up not working with the TCU I brought in; still using my old TCU. Talked to the dealer they said it has nothing to do. I don't know what to do neither. All other buttons on the steering working except the tiptronic rocker siwtches.

The tiptronic from selector lever is working fine!Can anyone help please? Thank you!

Paul

Edited February 16, 2013 by paulwu

[RFM]

Let the dealer check, with a PIWIS diagnostic tool, if the multifunctional steering wheel electronics are still present. Sometimes they lose their presence if tampered with steering boxes.

[gbratk]

Tiptronic bottoms have nothing to do with other steering wheel buttons. If they are working before is the only chance that your TCU is not coded properly. If you change TCU it needs to be coded with the same numbers like the old one, and the buttons have to work.

[paulwu]

Thank you everyone the speedy help. The dealer I went not doing proper job but charged 3.3hr job and turning back telling me the TCU I brought in is not correct one; said is for Cayenne Turbo. I double checked the one I got is 09D927750CB which is equivalent to 955.618.021.12 for 2003-present Caynne S V8 models with code IGOR/IT90/D9L. So mad and got fight with the "stealer"; for sure not going back to the same place.

I am in Montreal Canada; any recommend place to go and fix the TCU issue?

[gbratk]

Please tel me which sw number is your old one and you new one its written on TCU init decal.

[gbratk]

Thank you everyone the speedy help. The dealer I went not doing proper job but charged 3.3hr job and turning back telling me the TCU I brought in is not correct one; said is for Cayenne Turbo. I double checked the one I got is 09D927750CB which is equivalent to 955.618.021.12 for 2003-present Caynne S V8 models with code IGOR/IT90/D9L. So mad and got fight with the "stealer"; for sure not going back to the same place.

I am in Montreal Canada; any recommend place to go and fix the TCU issue?

Well, 09D927750CB has SW 0606, and this unit is for TURBO.

Start from beginning. What problem you have? Why yo want to change TCM?

[paulwu]

Thank you everyone the speedy help. The dealer I went not doing proper job but charged 3.3hr job and turning back telling me the TCU I brought in is not correct one; said is for Cayenne Turbo. I double checked the one I got is 09D927750CB which is equivalent to 955.618.021.12 for 2003-present Caynne S V8 models with code IGOR/IT90/D9L. So mad and got fight with the "stealer"; for sure not going back to the same place.

I am in Montreal Canada; any recommend place to go and fix the TCU issue?

Well, 09D927750CB has SW 0606, and this unit is for TURBO.

Start from beginning. What problem you have? Why yo want to change TCM?

I current have TCU 09D927750AG and got one 09D927750CB to be coded for the MY04 Cayenne-S; the intention beginning I just want the car with most updated TCU software so the car can run much smoothly as the fact the early cayenne all having the tramsmission clunk issue in low speed. Believe or not the dealers here they do not know anything about TCU software update; that is why I ordered an additional TCU.

If you sure the one I got is for turbo then can you tell me which one I need to get for Cayenne-S?

I decided to go with a TCU swap because I currently having another issue with the transmission; which could be either the output speed sensor (inductive transmitter) failure that need to remove the oil pan to do the change or with bad TCU. The easier way is to go with TCU swap my intention at least if not the TCU problem I still got the TCU software update for the car. This is the whole story; but now seems all screwed up; money spent in dealer for nothing and even lost my tiptronic rocker switch function. Sad!

Edited February 16, 2013 by paulwu

[gbratk]

Well here is the thing. If you have clunking when downshift it's more likely to be problem with valve body then TCM. But if you already change Valve body or you intent to, it's recommended to also change TCM with updated SW.

So now you have TCM 955.618.022.01 SW0352, that one needs to replaced with 955.618.022.03, or reconditioned 955.618.022.AX. These units needs to have SW0600.

Maybe will also work with 955.618.022.12 SW0602, but if you chose any of those you will also need to do DME update otherwise none of those TCU will not work in your car.

[paulwu]

The MY04 Cayenne-S is really a problematic car; I learned alot from it. I believe all the famous issues happened on my one. There is even uncommon one which is the front differential grinding noise; I have it too! Valve body already changed; getting better the clunking but still there especially when low speed cornering and downshifting. It is a pain. Now in the stage of TCU and my DIY skill got stopped so no choice and have to see dealer for coding and stuff. If not finding a good garage or dealer it would be like throwing money and time for nothing. Basically most of dealer mechanics know only changing parts following by its manual or training; but not fixing car. If your issue they never met then they don't know but still charging you money for them to play around; and coming out with bunch of excuses and you problem remains still.

The dealer I went already confirmed 955.618.022.12 SW0602 not working (is that truth? or who knows!) but the one I ordered the part said it works for all V8 from 03. Electronic part is not returnable. So now I am hesitating with TCU; furthermore, even I got a good one but if dealer turn out to me not working again? Of course they tell me to order and install from them and charging you double!

Sigh, I am in Montreal Canada and don't have a trustful Porsche dealer around; at least I don't know one here. I know bunch of good garages but no one has the PIWIS!

If you were me what you would do now? Thinking of selling the car but it is a long way I have been walking with; just don't want to give up this pig that early! : )

[gbratk]

I have to say that I have the same experiences with dealers...

Well I also change TCM unit, and they also said, that 955.618.022.12 SW0602 will not work in my car... In the and I bought this unit, coded by myself, and wooolaaa it's working! But the thing is, that I already have updated DME. I your DME is not updated yet, will these need to be necessary to work with newer TCM sw, and that can only be done with PIWIS.

[paulwu]

I have to say that I have the same experiences with dealers...

Well I also change TCM unit, and they also said, that 955.618.022.12 SW0602 will not work in my car... In the and I bought this unit, coded by myself, and wooolaaa it's working! But the thing is, that I already have updated DME. I your DME is not updated yet, will these need to be necessary to work with newer TCM sw, and that can only be done with PIWIS.

WOW..there seems to be a light again!

Can you please teach me how to code yourself? Or what to do in order to update the DME with PIWIS? In fact dealer they hate you telling them to do what but you need to pretend you don't know anything about the car and tell them the symptom..if needing to go back to dealer how and what I need to tell in order to do the DME update then coding the TCU?

Funny thing the dealer they would laugh you and looked you down if you said you got the info from the help of forums. In fact all I learn to fix this car one by one from forum help and I totally believe you guys are way further knowledgeable than those changing parts one there.

Edited February 16, 2013 by paulwu

[gbratk]

As I said, I know how difficult could be to maintain your car if you don't have right dealers... Anyway If you want to code it by yourself, you will need durametric or vag-com diagnostic tool. Do you own any of those yet? If you do, you could tell me which DME software you have, and maybe you already have updated. Well if not, is the only way to update it at dealer with PIWIS.

[paulwu]

I have Launch tool with most recent sofatware updated for Porsche and VW. I see there are coding functions but never tried it since there are no details to tell you what to do neither.

I retrive the DME info from Launch; there are many info:

Part # 8SL-VAS-N30-000

Ecu coding: 0000133

Diagnosis software number:9401

System designation: 041800144FG8SLVG

Prduction date: 14.04.03

Serial number: VWZ3Z0C5039905

Hope above info helps! If I can code myself it would like to hit a jackpot! Thank you!

[gbratk]

OK

First try to connect launch with your TCM but use VW software not porsche! Try now and post here, and I'll give you next instructions.

[paulwu]

Sorry I just got home now. Please let me know when you are online so we can try it together, or you can email me your instructions paulwu1010@yahoo.com Thank you one million and you have been very helpful!

I can connect the Launch tool in one min to my TCU. What info I need to post? I just tried it there are many selections.

Edited February 17, 2013 by paulwu

[paulwu]

Thanks to gbratk for help! Issue solved by re-coding the TCU. Great job!

[gbratk]

Thanks to gbratk for help! Issue solved by re-coding the TCU. Great job!

No problem Paul, I'm happy that we solve problem.

You should consider about donation at this form, coz then you have access to al TSBs and many DIYs, believe me they can be very useful.

[linksamui]

I'm having the same problem. How did you update DME and coded TCM to match? I'm in Thailand. Only porsche dealership is Porsche Thailand. Since my car was purchase via grey market dealer. They would not service my Cayenne Turbo 04. If gbratk could help me out would be awesome. I already have durametric and the cable. Your help would be greatly appreciated gbratk.