RDX had no issues when I bought it used. Suddenly, battery can’t hold a charge. I had it jumped a couple times and made long distance trips after each jump so alternator will refill battery. Still won’t hold a charge. Dash lights up both “check battery” light and “check SH-AWD” (super-handling all wheel drive) light, but no other dash lights.

I buy and install a new battery, same specs. New battery dies in a week. I buy a new alternator and install it myself (seemed simple enough). Battery continues to die and I continue to jump it. Thought it might be Bluetooth constantly drawing power from battery (read online that this is a common problem with 2008 RDXs), so I disabled Bluetooth. No change.

I check the amperage put out by the battery at rest. Sure enough, parasitic draw. I recheck the draw after removing individual fuses. After removing fuse #23 (labeled simply “BACK UP”) from the under-hood fuse box, parasitic draw is gone.

Can someone please tell me what “BACK UP” is? What systems does it affect to have no fuse in there?

 

 

When you 'disabled' bluetooth, how'd you do that?

 

 

 

@JSweatt you welcome