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Many Error Codes After Replacing Battery

adt1982

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Adam
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Last night I went to start my truck, and it would not start. Dash said the 12V battery system was low. I knew the battery was going to need to be replaced. This morning I got a new battery, charged it to 100%, and installed it. The truck still says that the 12V system is low and that the brake system has an error. I tried to do the BMS reset, but the battery icon doesn't show on the dash. I've attached a report of codes from my OBD2 reader. Any advice is appreciated.
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Gros Ventre

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There is an auxiliary battery under the rear pax seat. In order to reset the computer memory both the main battery and the aux battery must be disconnected.
 
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adt1982

adt1982

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Adam
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How do I disconnect the auxiliary battery? Is it the black or the Grey connector?
 
 







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