I have a 2006 Crossfire roadster and with the engine running the windows go down step by step as if something is switching the relay on and off every second or so so it takes a few minutes but left at idle the windows will drop by themselves. Bearing in mind I am not touching anything they are doing it themselves even when driving along.

If I press the window switch to put the windows up or down they work perfectly but if I put them all the way up they will work themselves back down again.

The roof light on the switch is flashing and the rear spoiler doesn't work.

If I operate the roof, it will after pressing the button a few times open but when closing it gets confused and gets stuck at the point the deck lid needs to close. The motor whirrs away but the lid doesn't close.

Now the interesting bit! With just the ignition on the roof works fine and the switch doesn't flash and the windows operate normally. The whole roof cycle works as it should.

Any help will be greatly appreciated as it has me confused.

I sell Crossfires and have 22 in stock currently so have tried swapping the roof ecu and everything is the same.

 

Well I think you're right . . . That is a new one! Obviously an electrical issue that shows up only while the engine is running. Strange . . . I would check for erratic output of the alternator.

 

Just what I was thinking.
This is where one of the old analog needle type voltmeters come in handy, or an oscilloscope.

 

RED DOG and ala_xfire have made excellent points. Also, could there be interference from a device that is on only with the engine running, outside of the alternator? An alternative method of checking for voltage spikes from the alternator would be swapping alternators or regulators, since Stu292 has more than a few of those.

Stu292, have you read error codes? With 22 Crossfires for sale, I would think that you have the proper diagnostic tools...

Stu292, please follow up with your findings - this could be very helpful for future readers with the same problem.

Klaus

Top Hydraulics | Rebuilt and Upgraded Convertible Top Cylinders, Pumps, Hydraulic Lines - Top Hydraulics, Inc

 

Thanks guys, I was going to try the alternator next and I will repost once I get it sorted. Hate it when people don't post what the fix was.
If anyone thinks of anything else it could be please let me know.

 

I just deleted my not so good ideas.
Is it save to unplug the alternator rather than replace?
I studied the top service info. No help without error code. I suspect you are getting none.
I'l look at windows next.

 

RCM?

Do all these symptoms go back to the same fuse or relay?

 

The windows and the top are controlled by the RCM (roof control module, Stu292 referred to it as roof ecu). Stu292 has already swapped RCMs, so we are trying to figure out what makes a good RCM misbehave. Modern RCMs, like the one in the Crossfire are quite well engineered. They have built-in over-voltage protection. Stu292's symptoms may be artifacts of the RCM shutting down briefly when the supply voltage has spikes - I don't know. Looking forward to Stu292's progress reports...

Klaus

Top Hydraulics | Rebuilt and Upgraded Convertible Top Cylinders, Pumps, Hydraulic Lines - Top Hydraulics, Inc

 

Klaus, what you are calling the RCM ( Roof Control Module ) is the PTCM on the Crossfire ( Power Top Control Module ), NOT to be confused with the Crossfire RCM ( Relay Control Module ) which is a unit containing relays and circuitry and fuses for engine control functions.
The Crossfire RCM has no relation to any convertible top function.
I realize you deal with a LOT of different manufacturers, just thought I'd point this out.
Hope I haven't offended.

 

ala_xfire,

thank you for the clarification! Indeed, there is at least one brand that use the abbreviation RCM for Roof Control Module. My apologies for the confusion - I should have left this subject up to the Crossfire electronics experts on the forum. Will stick to the hydraulics from here on... :-)

Klaus

Top Hydraulics | Rebuilt and Upgraded Convertible Top Cylinders, Pumps, Hydraulic Lines - Top Hydraulics, Inc

 

So what did you figure out?? Now there is another member posting with the same problem with the windows inching downward . . .

https://www.crossfireforum.org/forum...tml#post821865

 

Is the PTCM in an area were it could get wet?

 

Any possibility it's the switch in the header that's controlled by the D ring???

 

As to the windows working themselves down, yes, that would be my guess.

With the key on, grasp the D ring and turn it, the windows go down. If you return the D ring to normal, the windows will stop going down. If that switch is intermittent, or if the cam from the top assembly is loose, etc., then the windows WILL go down anytime the switch is (electrically) closed.