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No communication with scan tool to any module

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Hey everyone, my name is Danny King I am the owner of P3 Autokrafte I Dayton Ohio. Is anyone on this forum familiar with K line and L line communication on the 993? In the shop we have a 1997 Cabriolet that was brought in for a horn support. Very common problem right? During the course of the repair I tested the horn with the airbag off just to verify function. Of course this set the airbag light which I knew would happen so I plugged in the PST 2 to clear it. To my surprise I could not communicate with the airbag module upon further investigation I found I could not communicate with any module in the car.

Of course the car has Drive block and no matter what I do with Drive Blok it does not seem to matter I still cannot communicate. So I have no communication to DME,climate contro, abs, or airbag. At the OBD2 connector pen1 is voltage and pin 16 is voltage 10 four and five are ground and pin 7 is the K line pin 15 is the L line.

Power and ground are present on the associated pins where it should be. Some wiring checks have been done on the K like and L line circuits and no problems have been detected yet we still have no communication.

All I want to do is reset the airbag light. And the airbag module only has K line communication going to pin 9 of the airbag module. I have isolated the K line wire and substituted my own K line wire with a fabricated obd2 harness to allow me to bypass the car's wiring and go straight to the airbag module K line but still no communication. Other than pin 9 the rest of the vehicle harness is still plugged into the airbag module.

If anyone here is familiar with scan tool communication requirements and K line communication requirements on a 993 please help.

Thanks, Danny

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