02-02-2005, 04:36 PM
" Just thought I'd add to the history on the new site with info on my favorite 968 mod: Making your convertible top work even when the engine is running.
This was originally devised by memartin on 968.net, so I thought I'd give him his props...
How to bypass the dumbest idiot proofing ever on a car:
First, open your hood and find the fuse box. It is located pretty close to the windshield on the drivers side.
Find the G21 relay. (large square black fuse thingy)
Pull it out and find pin 6. This pin needs to be covered or disconnected somehow for your cab top to open and close with the engine on. Some people found that if they wrapped it in black electrical tape and reinserted the relay, that this worked. I personally could not get the tape to stay on when I reinserted the relay, so I just bent pin 6 to the side and put the relay back in. If I ever want to switch it back, I can just bend the pin back straight.
Some people actually have cut off the pin completely, but if you do that, then you have to replace the entire relay if you want to revert back to the stock configuration.
Thats all there is to it. Enjoy.
Mark (WYLDCTZ)
Here is some techy info posted by Techguy I found on how this all works...
----
The electrical system is composed of the fallowing components:
1.(2) roof actuation motors
2. A control relay for each of those motors
3.(4)limit switches (microswitchs)
4. Operation switch (center console)
5. Relay G21
A hard wire logic is established by the interconnection of the limit switches and the electric motor control relays. The limit switches detect the fallowing conditions:
1. Roof closed position
2. Roof open position
3. Roof locked
For example, if the roof is locked, actuation motors do not operate.
Relay G21 is the main control in this system. It is not a conventional relay with an inductive coil, this is a solid state relay (we can say it could be a small "ecu"). G21 decides if the roof can be actuated or not by means of a voltage (current) supply wire to the roof operation switch in the center console. G21 have the fallowing input signals:
1. Switched 12V+ (ignition switch)
2. Battery 12V+
3. Speedometer Signal
4. Ground (12V-)
5. 12V+ from the Fuel pump voltage supply line.
The logic programmed inside G21 is unknown. But based on what Bruce explain, when the engine is turned on G21 activate (enable) an interlock that prevents the roof to operate. Remember that a 12V feedback signal is received by G21 from the fuel pump. Taking the ignition switch to the off position must reset this interlock. "
This was originally devised by memartin on 968.net, so I thought I'd give him his props...
How to bypass the dumbest idiot proofing ever on a car:
First, open your hood and find the fuse box. It is located pretty close to the windshield on the drivers side.
Find the G21 relay. (large square black fuse thingy)
Pull it out and find pin 6. This pin needs to be covered or disconnected somehow for your cab top to open and close with the engine on. Some people found that if they wrapped it in black electrical tape and reinserted the relay, that this worked. I personally could not get the tape to stay on when I reinserted the relay, so I just bent pin 6 to the side and put the relay back in. If I ever want to switch it back, I can just bend the pin back straight.
Some people actually have cut off the pin completely, but if you do that, then you have to replace the entire relay if you want to revert back to the stock configuration.
Thats all there is to it. Enjoy.
Mark (WYLDCTZ)
Here is some techy info posted by Techguy I found on how this all works...
----
The electrical system is composed of the fallowing components:
1.(2) roof actuation motors
2. A control relay for each of those motors
3.(4)limit switches (microswitchs)
4. Operation switch (center console)
5. Relay G21
A hard wire logic is established by the interconnection of the limit switches and the electric motor control relays. The limit switches detect the fallowing conditions:
1. Roof closed position
2. Roof open position
3. Roof locked
For example, if the roof is locked, actuation motors do not operate.
Relay G21 is the main control in this system. It is not a conventional relay with an inductive coil, this is a solid state relay (we can say it could be a small "ecu"). G21 decides if the roof can be actuated or not by means of a voltage (current) supply wire to the roof operation switch in the center console. G21 have the fallowing input signals:
1. Switched 12V+ (ignition switch)
2. Battery 12V+
3. Speedometer Signal
4. Ground (12V-)
5. 12V+ from the Fuel pump voltage supply line.
The logic programmed inside G21 is unknown. But based on what Bruce explain, when the engine is turned on G21 activate (enable) an interlock that prevents the roof to operate. Remember that a 12V feedback signal is received by G21 from the fuel pump. Taking the ignition switch to the off position must reset this interlock. "
(This post was last modified: 07-11-2014, 11:23 AM by flash.)