Wiring Diagram Help - Roll Bar ECU

[rockhouse66]

Can someone point me to an online source for a wiring diagram that would include the roll bar ECU?  My '04 996 C2 Cab has a white wire wandering from back to front and I now see it is an extension of a green/white wire from the ECU.  I have no idea where it terminates at the front - haven't been able to find it.

 

Here is the area I am looking for:

 

Edited April 19, 2016 by rockhouse66

[Loren]

I sent you a PM.

There is not an rollbar ECU - just an overturn sensor circuit.

 

What are you trying to do?

[rockhouse66]

I am just trying to figure out this stray white wire.  It is hot when the ignition is on (maybe all the time).  And this green/white wire must have a purpose - yes?

 

I am basing what I think this box is on the part number which is printed on it:

 

[Loren]

That is the top control unit - the overturn circuitry is also in there I believe.

 

Which white wire to which connector please? Sorry I can not tell from the photos.

[Richard Hamilton]

I can't see a green/white wire on the wiring diagram going to the roof control module.  Could it be green/yellow?  If so, the connection at the control unit end is shown as "Button Open" so I expect someone has hacked in to it for some aftermarket device.  Unsurprisingly, the green/yellow wire goes forward to the convertible top button.

Edited April 19, 2016 by Richard Hamilton

[rockhouse66]

I am (or was) 100% sure that this white wire was added when the PO had a XM unit installed.  I was going to just remove it but it was hot when the ignition was on so I thought I better wait until I trace it's origin.  Now I know that it is not just spliced into an existing wire, it is a replacement for an existing wire.  So now I am trying to figure out which wire got replaced so I know what to do with this thing.  One more picture below.  I don't think it is green/yellow as there is a green/yellow nearby...?

 

Edited April 19, 2016 by rockhouse66

[Richard Hamilton]

I can't see a green/white (GN/WH) wire going to the module:

 

[rockhouse66]

I'll try to get a better look, but maybe green/gray?  BTW, everything seems to work OK with the top.   I thought that when closing the top with the key that the windows should also close and they don't, but the owners manual suggests that the window closing is not part of the key closing process.

 

I guess I could disconnect it and see what doesn't work?  Sounds a little risky though - knowing that strange things can confuse the computer.

[rockhouse66]

OK, what do you think?  green/white or green/gray or ???

 

[Loren]

Green/Grey (GN/GY)

[rockhouse66]

OK, so this spliced in white wire should go to the dash mounted open/close switch and control the close?

Edited April 19, 2016 by rockhouse66

[Richard Hamilton]

OK, so this spliced in white wire should go to the dash mounted open/close switch and control the close?

-------------------------

Yes.  The GN/GY and GN/YE wires are switched to earth to signal the control unit.

 

Pin A4 has a brown wire attached which goes to a ground point.  A3 & A5 are for illumination.

 

Edited April 20, 2016 by Richard Hamilton

[rockhouse66]

Just to close this out, I removed the horseshoe trim piece and found a short piece of green/grey wire from the power top switch spliced to the other end of the white wire that is spliced in back at the ECU.  Mystery solved...well, sort of.  Can't imagine what would require replacement of that complete wire from front to back.

 

Thanks for all the assistance and support on this exploration.  I could not have done it without RennTech!