If the deposit account and the loan account are housed in the same financial institution, the exception that Brian showed you covers the matter, regardless of where the loan was signed. That includes dealer paper.
Of course, if the authorization is given at the dealership, you may need some paperwork to know about it, no?
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8