Cabrio switch makes the indicator blink 4 times

[Soze911]

vMy 2002 C4 Cabrio top more often than not, will fail to open or close when using the switch. It always works (up/down) when I operate it with the key.



Condition under which the top will consistently work:

* insert key into the door lock

* turn left or right and hold

* top goes up/down respectively



Conditions under which the top INconsistently works:

* Key on the ingition (engine running or not)

* e-brake engaged all the way

* door(s) open or close

* activate the convertible switch

Results:

* Sometimes the top will go Down, but most times the top indicator on the dashboard will blink 4 times and nothing happens

* Sometimes the top will go UP, but most times I'll get the 4 blinks

* Sometimes the top will go UP/Down without any issues, under the same conditions.



Battery is less than two months old, and have no indication that the battery may be the root of the problem

All joints on the top are properly lubricated

Do not hear any grinding noises, and when the top moves, the top motor is smooth and quiet



I've read all I could find on this topic and I'm leaning towards a microswitch, Shouldn't the 4 blinks indicate which microswitch to replace? how do I test each?



Thank you

[FPB111]

What switch is bypassed when you use the door lock option? Parking brake?

[Soze911]

Thank you FPB111.

Turns out the hand brake switch was bad. I replaced it today, but I must have forgotten to re-connect something. The headunit (premium sound, package double din, Nav, and obc) displays "Phone" and won't turn off.

Turning the key off won't shut down the PCM display, removing fuse D8 and D9 won't shut down the display. Only by disconnecting the battery does the display shut down, though as soon as I turn the key, the display comes back on and require battery disconnect.

This is really frustrating, I've had 2 Air Cooled Porsches and I never had a problem with them. One I had for 14 years, and the other for about 3 years. The only think I changed on those things was the battery on both, and the fuel accumulator on one of them.

[Casey at Pelican Parts]

Originally Posted by Soze911

Thank you FPB111.

Turns out the hand brake switch was bad. I replaced it today, but I must have forgotten to re-connect something. The headunit (premium sound, package double din, Nav, and obc) displays "Phone" and won't turn off.

Turning the key off won't shut down the PCM display, removing fuse D8 and D9 won't shut down the display. Only by disconnecting the battery does the display shut down, though as soon as I turn the key, the display comes back on and require battery disconnect.

I am wondering if you've got a sticky ignition switch?