ColorChange

Can anyone tell me where the CAN bus connector is located on an '04 tt? It is a 32 pin (2 rows of sixteen colomns) and should be a green connector. I would expect it somewhere between the PSM up front, and the ECU. It is not on the ECU back deck lid. It is not the OBDII port. Any thoughts?

TIA

Tim

Premier Motorsp

Are you certain this actually exists?

My understanding is CAN consists of CAN hi, CAN lo, and maybe +12V and ground. I know the CAN connector on a Cup car is 3 or 4 wires.

I am sure you can get these off the OBD2 port.

Chris Cervelli
Premier Motorsports

ColorChange

The green CAN connector exists according to AIM. I don't think you can get the CAN off of the OBDII.

924RACR

Yeah, just CAN Hi and CAN Lo, and they should be built into the OBDII plug (even if they're available elsewhere). Sounds like you've got a plug to tap into it correctly for the AIM system?

I know the ODB-II connectors on GM cars are always the same shape under the dash, but I know that doesn't help you! Sorry...

924RACR

Oh, to clarify - ODB-II diagnostics, etc., are all usally run through the CAN bus. Dealer service tools, etc...

Wish I worked on Porsches, could be more help to you... not to mention more fun than working on the other P-cars, Pontiacs!

ColorChange

I think you're right Vaughan, the CAN bus is on the OBDII port. Now I need the pin outs for the CAN high low.

Premier Motorsp

All OBD2 connectors are the same. Perhaps the AIM plug goes into the OBD2 port, which is above your left knee when you are driving.

Chris Cervelli
Premier Motorsports

ColorChange

Chris: Thought I had the correct pin outs but no luck so far. Hmmm!

924RACR

ODB-II is standard? Same connector on a GM as a Porsche? If that is so, I could hunt that down! Unfortunately, I'm not back in the office until Monday, after F1...

Premier Motorsp

Yes, all OBD2 plugs are the same. That is the idea. A universal standard for on board diagnostic.

Color,

According to the 996TT wiring diagrams:

CAN hi: D36 at DME plug 4 (40 pin) wire is Blue/White
CAN lo: D37 at DME plug 4 (40 pin) wire is Grey/White

My understanding of CAN (which may be 100% wrong) is that those two wires somehow carry the pertinent information to all the control units. So you should be able to tap in anywhere.

If so, then maybe it would be easier to find wires with those colors at the OBD2 connector.


Chris Cervelli
Premier Motorsport

ColorChange

Chris: Where is that connector (DME 4 plug) physically on the car? I have my manuals at home.

Premier Motorsp

There are 4 plugs on the DME box, which is located on the underside of an aluminum panel under the subwoofer, if you have a subwoofer. W/o subwoofer you pull the long skinny carpet part out from behind the rear seats. You'll then see the aluminum part I speak of. It comes out with a couple 10mm nuts. The DME is the box on right with 1000 wires going into it.

Are you going to Autobahn July 4 weekend?

Chris Cervelli
Premier Motorsports

ColorChange

Chris: I don't think I'll make it on the 4th.

And Damn you, be faster next time! I just put all that **** back on the rear deck! Ughhh! What a PITA with a roll bar.

On the right, the passenger side?

Thanks

924RACR

Chris - your understanding is correct. There's a reason CAN sounds like LAN, it's just like an Ethernet for your car. Just a matter of a) tapping in and b) knowing what message ID's and bytes you're looking for. Again, I apologize for only working on lowly POS American cars or I'd be able to try and hunt down message lists for you guys.

Premier Motorsp

The AIM dash should automatically decode all the data packets or whatever they are called, so he shouldn't need that.

Next question. Before CAN, there was OBD2. It always has a K line and an L line. Is this similar to CAN hi and lo?

Chris Cervelli
Premier Motorsports