Power door locks and heater blower not working

2000 Plymouth Voyager with 159,000, having the exact same issue. I have checked all the fuses to see which are fine. I suspect that one of the relays has gone bad, but can't be sure. Any idea how to test these?

I know it's been 12 years since this question was posted, but I am having the exact same issue [almost]. 2000 Voyager [moms] sat for a while due to little brother running it out of oil, fast forward to me needing a vehicle for commuting to work, so I slung a advance auto 3.3 in it. Ran it until I found a car I really liked. Sat again when the power steering line rusted out.
Replaced the line and started checking it for regular use, after a week or so, the airbag and ABS light came on and went off after about 5 minutes of driving towards the local speedway for coffee.
Proceeded to do this all that day, then stopped for a day. Just noticed that when the lights go out on startup, if the blower does not come on, then the lights come back or don't go out.
Several Chrysler forum readers say its grounds, but I am not so sure, and yes, when these lights are on the turn signals do not work.
I have checked battery voltage and alternator charging voltage and they are in spec.
Previously the signals wouldn't work but I pulled the flasher unit and flowed the solder connections, and the turns have worked fine ever since, except now when the airbag/ABS lights are on.
Waiting on a friend's complex scanner since my simple obd2 reader didn't show any codes.
But something has to be going on that kills the blower and turn signals when those two lights are on.
Read a lot about the clock spring failing but it seemed as if it was mostly earlier models?
All the gauges work, low fuel and rear gate/door ajar indicators, all of them work.
Also, every now and then the radio has no audio, but it comes back later, and the reception is not good, but I don't know if that's related or not.

I hope someone sees this and has a solution or a lead.

Thanks,

Douglas Hunt

The blower only fails to come on at the same time as the airbag/ABS lights stay on. If those two lights, go off in sequence after the check engine light and oil light then the blower works fine. Same as the turn signals, if the airbag/ABS lights stay on, then the turn signals won't work. But if the airbag/ABS lights go out upon startup, then the turn signals work fine.

Okay, thanks.

It will be a while, as my simple reader indicates no faults, yet others have indicated I will need a more sophisticated scanner to read the airbag and ABS modules and I have a friend who has a good scanner, but he loaned it out and hasn't got it back yet
in the meantime, I use it every day, and at this time when those lights "stay on" I simply turn the ignition switch off, wait about 10 seconds and 9/10 times the lights clear on restart.
I won't pull it out of the driveway if the turn signals and blower don't operate.
I read on searches about clock spring issues, or possible bad solder issues in the dash cluster, but all the gauges work and the horn works, so that's just a secondary theory in my head.

Thanks, sometimes the lights go off, and then there is a "ding "sound, and the airbag light comes back on. Again, I just restart and 9/10 times they both go out in the usual sequence.
But as far as the ABS failing, I did move that unit (kind of under the driver's seat area, under the van) out of the way when I was replacing the power steering line [ what a job, under the van, sheesh they should've used a different type of fitting for that rack/line connection, haha.
So, I might jack it up and check that there isn't an issue where the wiring connects, though I did not disconnect anything, just the three mounting bolts so I could have a better shot at that power steering line at the rack.