New Airbag CU ... now seatbelt faults

[hoggel]

I replaced the airbag control unit in my 993 with the new one (996 part number). Now my car has faults for both seat belts. How does the CU know it's in a 993 that doesn't have seat belt contacts?

[hoggel]

I replaced the airbag control unit in my 993 with the new one (996 part number). Now my car has faults for both seat belts. How does the CU know it's in a 993 that doesn't have seat belt contacts?

From another forum I learned that the airbag control unit must be programmed via the PIWIS (dealer).

[wvicary]

I'm very surprised it has a 996 part number. I thought the 993 used a different generation of air bags then the 996. What was your old part number on the control module and how did you determine the ECU was at fault?

[hoggel]

I'm very surprised it has a 996 part number. I thought the 993 used a different generation of air bags then the 996. What was your old part number on the control module and how did you determine the ECU was at fault?

There is a TSB, 6863, that replaces the 993 part number with the 996 unit. I had two 993s. I went to pick up one of the cars from an inside storage place. The car had a dead battery even though it was supposed to have my battery tender on it I think they had tried to start the car with one of those booster packs. They denied it but after I got the car started the airbag light was on. I was taking it to the shop for some other work and asked them to fix the airbag issue. They ordered a CU from a dismantler but the one they received didn't work. In the meantime I sold the car so had to take the CU out of my second 993 in order to ship the sold car. That CU was a 993 PN. When I put the new CU (996 PN) in my remaining 993 the airbag light stayed on. I verified with PN with Sunset. I used the Durametric tool to check the airbag DTCs. The CU must be accessed as 996. And that's how we got to the post above. sorry about the typos and grammar posting from mobile. Edited May 2, 2011 by hoggel