993 Alarm mystery

[mfelsbourg]

Hello all, been reading these forums for a long time, but registered today to post a problem myself. I hope someone can help me out:

We have a 1996 993 C2 Cabriolet, with an alarm issue. It stood still for a few months, when we wanted to start it up it turned over, but didn't start. I have no signal to fuelpump and ignition, so should be immobilizer. The rest all works.

It had an alarm besides the factory one, so we first took that out. Now it only has factory alarm. Since it is a model 1996, but production 1995, it has the "old" box with the 928.618.260.02 number. Besides that it has a DME/Motronic 993.618.123.10 without immobilizer.

We changed the #928 box, now it got back to life more, because the alarm is sounding directly. I am not able to reset it through the door locks, there were no fobs to the car, because of the lack of an "wegfahrsperre".

Main question: now that everything looks to be in an original state, how do I rest the alarm?

Thanks! Maurice

[Bill Verburg]

Originally Posted by mfelsbourg

Hello all, been reading these forums for a long time, but registered today to post a problem myself. I hope someone can help me out:

We have a 1996 993 C2 Cabriolet, with an alarm issue. It stood still for a few months, when we wanted to start it up it turned over, but didn't start. I have no signal to fuelpump and ignition, so should be immobilizer. The rest all works.

It had an alarm besides the factory one, so we first took that out. Now it only has factory alarm. Since it is a model 1996, but production 1995, it has the "old" box with the 928.618.260.02 number. Besides that it has a DME/Motronic 993.618.123.10 without immobilizer.

We changed the #928 box, now it got back to life more, because the alarm is sounding directly. I am not able to reset it through the door locks, there were no fobs to the car, because of the lack of an "wegfahrsperre".

Main question: now that everything looks to be in an original state, how do I rest the alarm?

Thanks! Maurice

I can't help w/ the alarm but I can tell you how to get the car going as long as you are correct in having a non immobilizer DME.

The only thing preventing the car from starting and running is the relay 61

so buy 964.610.184.00
it looks like this



installed it looks like this, lower left corner relay


If you do have an immobilized DME this still works when the chip is replaced w/ a non immobilizer chip