Reviving this thread (again) ....

Don - how do you like having the clock installed on your dash? My 2012 Cayenne S doesn't have one and I've been increasingly obsessing about that fact the 2012 MY 958's SHOULD have a clock (and I think it looks cool...). Now that you've had yours for the last year+, are you happy with the addition? I'm looking for my next DIY project and with the detailed write up that you and others have provided this may be it. But before I dig in, I'm also wondering how you'd rate the DIY complexity, particularly given the funky wiring work.

Thanks for any thoughts to help me figure out if this is my next DIY project :p

I like it. Had some friends (couple) in the P!G a week or two ago, wives were in the back. My friend commented how nice the thing was - and specifically mentioned the clock as being great because it's analog and easy to find/see.

It's not an awful DIY - it just requires getting to the wiring on the back of the PCM, and using the correct Positap connectors to splice into the data lines and power feed/ground. The rest of it is simple - you replace the central grille with one made for the clock, mount the clock in it, and plug it in once you've got the wiring in place.

It's certainly a bit pricey for a clock - but it's always amusing to watch the hands figure out where they're supposed to be when the computer wakes the car up.

Well, you've sold me. I just found and bought an analogue clock on E Bay for $160, have sourced a new dash cover with the clock housing from my local P Dealer, but I've hit a snag on the wiring harness. When I used your link to buy the harness from the Chinese guy, I was informed that this part is no longer available :banghead:. The P Dealer does have the Cayman harness and says that it will work (as it looks like Speederman, roders, and termite have), so I guess I'll have to bite the bullet and buy the Cayman harness and extend the wires .... Oh well, at least this project will keep me away from any other (more expensive) mods on my cars. The only good news on the Cayman wiring harness is that it's about a $35 part, so I'll just think of it as I've just saved $65 :)

Thanks to all for the great detail and write ups on this, I'll be sure to post up my results once I get everything in hand and knock this project out

About to Install my Clock on my '12 Cayenne S...
 

So I've sourced all my parts: 1) OEM clock on EBay for $160 (with the second hand still attached, for now :thumbsup:), 2) OEM dash grille cover from the P Dealer for $161, 3) Cayman wiring harness from the P Dealer for $35, and 4) PosiTap connectors from Don for $11. All I need to do is clip the 2 unneseccary plug ends off the Cayman harness, strip out the unnecessary leads, and extend the 4 required wires before I yank out the PCM throw this all together .... hopefully I'll get this done this week, and I'll post up pics of the wiring while I have the PCM out.

https://cimg4.ibsrv.net/gimg/rennlis...d51fbc6729.jpg

https://cimg7.ibsrv.net/gimg/rennlis...0f839045a0.jpg

https://cimg1.ibsrv.net/gimg/rennlis...119906a641.jpg

Thanks for Don, Roders and Speederman for all the helpful info, including the wiring pattern for the harness!

Awesome, I have been wanting to do this.

Succesful Installation of Dash Clock!
 

After receiving my PosiTap connectors from Amazon Prime on Wednesday (per Don's strong recommendation), I installed my dash clock last night. I have to say that with the CORRECT tools and the great instructions from Don, Roders and Speederman, this was a pretty straightforward process. I did YouTube "Cayenne Vent Removal" just to see how it's done, but other than that and following the wiring map from Roders this was pretty easy DIY. In fact, the Cayman wiring harness wiring colors matched up 100% with the Cayenne PCM harness, so that was even easier than I expected. With all the OEM pieces in hand (see my previous post), all I needed was some additional 18 gauge wire to extend the Cayman wiring harness, 4 PosiLocks to firmly connect the 18g wire to the 22g Cayman wires, 2 medium PosiTaps (to tap into the 22g PCM data lines) and 2 medium-large PosiTaps to tap into the 16g Power and Ground wires. For anyone doing this, the Posi products are a GREAT solution for this installation as they're easy to use and make a really great connection (both the locks and the taps). And DEFINITLEY use a big ass towel as Don suggested to cover the center console and shift assembly as the PCM is heavy and a bit awkward once you pull it out to work on the wiring harness.

Once I had everything wired up, I plugged in the clock and much to my delight I saw the clock hands swing around and set to the correct, PCM-matched time. Initially, I didn't get the additional "Time-Chrono" PCM menu item, but that appeared this morning after my commute in (about 35 minutes). The backlit feature works as well, so it's good to go and didn't require any additional menu selections. Here are a few pics of each step, including the wiring into the back of the PCM, plus the obligatory "Before & After" pics :biggulp:

https://cimg6.ibsrv.net/gimg/rennlis...e3ebc5f0fc.jpg
https://cimg5.ibsrv.net/gimg/rennlis...80cd8cf8c6.jpg
https://cimg2.ibsrv.net/gimg/rennlis...537c3f7037.jpg
https://cimg9.ibsrv.net/gimg/rennlis...853888ec15.jpg
https://cimg8.ibsrv.net/gimg/rennlis...de189cb4b4.jpg
https://cimg3.ibsrv.net/gimg/rennlis...a76d3cadd7.jpg
https://cimg3.ibsrv.net/gimg/rennlis...fb240d6e4e.jpg

https://cimg2.ibsrv.net/gimg/rennlis...3320cfb755.jpg

Looks great, and glad to see the Cayman harness worked well, since it's cheaper than any other option I've seen.

:D

Hey guys, I found one of these clocks along with a cayenne key fob as scrap and would like to make re-purpose it and make a wooden piece around the clock and make it into a Porsche themed key holder/hanger. Just a cool little art piece. Does anyone have a wiring diagram and amperage specs in order to get this going off of 120 volt from the wall? Also I would love to be able to set the time if anyone knows it there is a way to manipulate it. If I understood correctly its controlled by the CAN bus in the vehicle and I wont be able to manipulate it. Any help would be awesome!
Thanks!

The clock doesn't have a traditional clock mechanism in it - it's run by stepper motors that are controlled by the computer bus - so getting it working outside the vehicle will be about impossible unless you can reverse engineer the signals that are sent to it by the PCM. It gets its time from the PCM, which gets its time from the GPS signal (with manual compensation for time-zone.) Not a trivial thing.

At best it will make a nice decoration - but non-functional. If that isn't what you want - you might offer it up here for someone who has a broken one, or is looking to add one to their vehicle. Is the one you have the clock, or the stopwatch/clock?

Wow that is a bummer. Its just the clock, same as pictured above. Do you have any articles on how its controlled? If its simpler to take the electronic guts out and take the face and put it on a quartz movement I may do that. Either way, its too beautiful of a piece to give up so easily on it! (Plus you cant beat free!)

I haven't seen any articles. And no idea if it would be possible to put in a different movement. Unlikely since most quartz movements don't have a face mounted second-hand below the center. And the hands are very unlikely to fit the quartz movement. Plus you would have buggered it up - even if it was free.

I'll repeat my suggestion - someone here can probably use the clock, and might be willing to offer you a handling/shipping fee. All you have to do is offer it for free (since you're not a paid member you can't list it "for-sale") and the clock will get used for what it was intended for.

Red is +, brown is always ground (-) on any German car. Here is the diagram:

https://cimg9.ibsrv.net/gimg/rennlis...964356ce58.jpg

The wiring for the compass, sport-clock and normal clock are all the same.