Twolf.... At the time I needed one the dealer also wanted 600 bucks. I had a used one that the dealer did not want to install. I knew it would be good but I had to convince them. Wtf who knows why?
I can't speak for your specific dealer, but generally, the reasons are liability and warranty. There isn't a way to test these as deployed/non deployed, nor the history.
A factory unit we can go after the factory with an issue, and we know exactly where it came from. Unit from elsewhere could have any history. Maybe deployed, maybe not deployed, but in a flood (see previous post about sealed units) or who knows.
You have a problem down the road, the client blames the dealer, the dealer blames the client or seller; you have an accident, an ambulance chaser goes after us because 'we know better'....and it just gets to be more trouble than it's worth.
Anyway FYI, we had an apprentice install an SDM once, broke the rules, had the battery connected, (no, no, no!), flipped the module over for some reason, blew every damn bag in the vehicle!
Be careful out there!
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