Or do they not exist in this pic of the back of my PCM from a 2005 Boxster S? (CAN high & low)

 

Not having a wiring diagram to go by is always just WAG about what goes where, but going by a 2001 wiriing diagram none of the wires have the same color as any of the CAN H/L lines that are at other places in the diagram.

Furthermore, looking at the diagram I see no CAN lines at the PCM.

 

These photos are:
Pin diagram from top of PCM
Wiring diagram of Boxster but I don't know what model year.

My PCM is equipped with NAV, Bose, no sport chrono.
I believe the two orange cables are fiber optic which speakers are linked.





Does anyone have a wiring diagram for a 2005 Boxster?

 

Alright, maybe someone knows the answer to this question then...
My PCM has a digital clock display. My instrument panel also has a digital clock display. They seem to be in sync so they must be electronically linked. Doesn't that mean there has to be wires running between the two and if so, are they not the CAN high and low?? (Which means at least two of the wires in the pic have to be them?)

 

Change one clock and see if the other changes too.

If the other changes concurrently with the other one then I'd say they are indeed linked.

And by CAN could certainly be possible. But without a wiring diagram it is hard to know which lines are CAN. If the car is on and the CAN bus active the lines would be electrically active but I have never bothered to use a volt/ohm meter to "look" at the CAN lines/signals.

CAN is a differential bus and I believe the voltage levels on both lines would read around +5V but like I said I've never used a volt/ohm meter to look at CAN signals. I used an analog or digital logic scope so I could see the line signal pulses and I was using a relative inexpensive CAN bus simulator not a real car's CAN bus. The only thing I plugged into the car's CAN bus was a CAN bus snooper, Vehicle Spy.

You have to be very very careful. Static discharge into a CAN line and you could blow some expensive processors.