OK, folks. I've been working with Matty Moo on this, and as has been said elsewhere he's a real stand-up guy. He's sent me two computers to try to sort this problem. I have now installed three different computers, including:
#1. The original, which both Matt and I have resoldered.
#2. An AWD version that's ABS/TRACS. Didn't solve the ABS prob and added the BRAKE FAILURE: STOP SAFELY ASAP.
#3. Another ABS/STC computer, but without matching model numbers, possibly from an earlier model year.
See photo below for images and details on the three computers.
Matthew (the MVS guy) has had a similar problem with his dad's S80 and that issue was sorted with a new CEM
A local volvo shop here had a similar car recently where the same symptoms presented and they changed the computer three times before finally discovering that the car's battery had two bad cells. That fixed the ABS problem!
1. Perhaps I have not adequately diagnosed the ABS problem, since neither of the two replacement computers had matching numbers.
2. Perhaps the computer is bad, but not in a way that resoldering can help.
3. Perhaps I have a CEM or battery problem as described above.
Would folks here agree that the next step is to try an ABS computer with the same part number? Does anyone have experience with these mismatch issues? A lot of the conversation from Ozark Lee and Matty Moo focuses on earlier model cars than my 01 V70.
Again, grateful for any thoughts.
Jonathan in Branford, CT