PCM 3 dead after flat battery

[Technomad]

OPC Glasgow has had my 997.2 for three months because they couldn’t source a replacement window regulator. That was bad enough, but they didn’t charge the battery in the whole time, until the day I went to pick it up. Two days later, the battery was as flat as a very flat thing (I assume it’s pretty much fecked) and I had to do the dance with the emergency terminal and jump leads to get the bonnet open. Reconditioned the battery overnight, so the car will now start. But the PCM 3 system is completely dead - won’t turn on at all. I’ve checked all the fuses that might be related on the main box - all good. It’s not just the display as the instrument panel isn’t showing any of the data that would usually be relayed from the PCM.

Any ideas then about how to reanimate a PCM 3 head unit? I have heard that there’s a 10A fuse on the back of the unit itself - can anyone confirm this?

TIA…

[Technomad]

It appears not: no sign on the back of the PCM 3.0 unit - all the references I've seen are, like yours to the PCM2.x systems, which do have a fuse on the back. Ah well…

[Technomad]

Nothing connected the wrong way around - that’s something I’m absolutely paranoid about!

[Technomad]

That is in fact my view, and they’re picking the car up tomorrow.

[Technomad]

Well, they picked the car up, tested the PCM 3 and called me to tell me it was dead. Well, d'uh… They also said that the expiry of the PCM probably isn't related to their allowing the battery to go flat or the revivification of same. That falls very heavily into the area of 'trying it on' - more specifically, 'failure of duty of care'. If they don't change their tune, they'll be finding out just what it means when a civil case is based on, "balance of probability".

[Technomad]

See original post - they charged it up the morning of the day I picked it up, having left it untouched for three months.