bestco7866

I have a 1997 993 and my convertible top will not operate. The dashboard light for the hand brake illuminates when I pull the brake but not the light for the top to operate. I have replaced the hand brake switch that sits at the back of the pull arm but that did not correct the problem. Anyone else have this problem or any suggestions where to go next?

CabrioArtie

The light in the clock does not illuminate unless the top is in the process of opening or closing. When the top is completely open or closed the light will not be illuminated.

What happens when you push the switch to open the top?

bestco7866

Hmmmmm I don’t think I ever realized that.

nothing happens when I press the switch to open the top

bestco7866

Do you think it could just be the rocker switch?

CabrioArtie

Just so we've covered all the simple items first, the cabrio top switch can be pushed both at the top and the bottom of the switch, Depressing the front (forward) part of the switch closes the top and pressing the rear of the switch opens the top.

So, with the key in the ignition and it turned to the on position (engine doesn't need to be running) and you depress and hold down the the back part of the switch, what if anything happens?

ToreB

This is most probably a cabrio control unit fault. The internal solderings on the connector output pins are known to fail due to vibration. They also have other know electronic challenges, but I'll put my money on that a quick resoldering job will fix this.
This (black plastic housing) unit is placed under the dashboard near the steering column, stacked above the Central Informer Unit, which has an aluminium housing. It is a bit fiddly and uncomfortable to dismantle these.
Cheers,
Tore

bestco7866

With the key in the number 2 position (car not running) when I rock the switch to either position nothing happens but I can hear it click under the dashboard. I have done some more research on this forum and have learned about the problem with the control boxes. Are there any other suggestions before I tear in to that?

This is my first time using a forum like this and I can’t tell you guys how much I appreciate this!!

Rdelvalle

Top Control Moule Removal Detailed Instructions - Rennlist - Porsche Discussion Forums

ToreB

Several relays shall operate inside the control unit in operation, so hearing relay clicks is not a valid verification of it working or not. The relays can also work fine, but the bad solderings will prevent any signals coming in or out of the unit.
I use to remove the control unit without dismantling the ventilation outlet, but it is a bit fiddly.
Cheers,
Tore

bestco7866

Got it! Thank You

The picture of your ride looks awesome!!

systemsc

Correct (5 relays). Read here under Porsche, Cab Top; https://www.systemsc.com/problems.htm

rdad993

A relatively easy way to check if there is power to the lift motor is to get behind the rear seat and remove the cover (one plastic screw is all that holds it). Note the motor at the bottom of the bay. Find the motor electrical connector which might be under the motor or under the carpet. There are 4 screw holding the motor in place, easy to remove. Disconnect the electric connection and while doors closed, ignition in position 2 have someone depress the top switch while you have a simple test light in the car side of the connector. If the light comes on, you have power to the motor. Then suspect the motor is bad. Doing this simple test relieves you of getting under the dash to get at the controller (major PIA).
Now you can also check the top drive cables, easy to pull cables. If you have about 1/2" of end showing on each, and cables seem free they are probably ok. Next reconnect it all and tap the motor with a little hammer again while someone is holding the switch down. The motor may come briefly back to life. A new motor is about $300. Good luck!

bestco7866

This is another possibility and a great suggestion. Thank you so much!!

bestco7866

Hi Everyone and thanks for the help so far, but I'm back. I have had my control module re- soldered by a pro and now I get the dash light to illuminate when I try to open the top but the top does not move. The dash light now stays Illuminated along with the brake light and will not go off even when I release the brake. I can hear clicking under the dash when I press the rocker switch