Passat (B5) :: CEL Code P1545 - Throttle Body Adaptation

I have a 1999 B5 Passat GLS V6. It's been running well, though I had to replace the CCM last winter due to water intrusion. Recently, the battery needed replacing, and I swapped it out, then the car wouldn't restart normally. I can get it to start by holding a bit of throttle, but it still runs rough and won't idle. The Check Engine Light is on, and my OBDII reader gives me the P1545 code. The car will run in 'limp mode', but it maxes at about 15mph, and I need to keep a little throttle on constantly to keep it from stalling. I think I could make it the mile or two to the local VW dealer, but maybe late at night, with no traffic - it's certainly not driving normally, or even just 'poorly'.

A bit of Googling says that I need to do the Throttle Body Adaptation by opening the hood (and maybe the driver's door, turning the key to the 'run' position without starting the car, and then waiting for the whining noise that indicates the throttle servos are running through their range, and then I'll be fine. However, this procedure has not worked. Am I doing it wrong? Or does it not work with this make/model/year?

I walk up to the car, unlock it, pull the hood lever in the footwell, go open the hood fully, then sit in the driver's seat, leave the driver's door open a bit, and turn the key to 'run', without going all the way to 'start'. I've tried this procedure after clearing the code with my OBD reader, with and without cycling the key to off, and various other ways. If I can't make this work, then it's off to the VAG-COM list, and see if there's someone in North Seattle who can assist. I can also take it to the dealer, but I'm not thrilled about trying to drive it even that far.