Weird Power Running Board Issue

[Ex Euro Driver]

2014 Yukon Denali. My battery was starting to give up and had the typical low voltage electrical gremlins when the truck was started (HVAC system randomly turning on the AC, power running boards not responding). The drivers side running board was stuck in the down position and the passenger side was stuck in up position. I replaced the battery and everything works fine now except the running boards. They’re still stuck. I verified the fuse is good and attempted the relearn procedure 3 times with no luck. Any ideas on where to go from here? TIA

 

[Geotrash]

2014 Yukon Denali. My battery was starting to give up and had the typical low voltage electrical gremlins when the truck was started (HVAC system randomly turning on the AC, power running boards not responding). The drivers side running board was stuck in the down position and the passenger side was stuck in up position. I replaced the battery and everything works fine now except the running boards. They’re still stuck. I verified the fuse is good and attempted the relearn procedure 3 times with no luck. Any ideas on where to go from here? TIA

Are you sure the problem is limited to the battery? Even if the alternator appears to be putting out normal voltage, it can still have a bad rectifier diode and be sending gnarly power and ripple voltage through the electrical system on these, causing weird issues.

How to test:

The only other thing I can think of that would affect both running boards at the same time is the relay. They're cheap to replace and worth a try.

 

[Ex Euro Driver]

Appreciate the reply. Just going to swap the 30 amp fuse with another in the fuse block and see if that works. It’s definitely charging correctly and nothing else is acting up. Fingers crossed it’s a relay/fuse

 

[Ex Euro Driver]

Swapped fuses and still no luck. Stumped on this one…Suppose I’m headed to the dealer

 

[gooffeyguy]

Did you try flipping the override switch on the dash under the HVAC controls just to see if that has any effect?

 

[Blackcar]

I did this reset on my Yukon and straightened problem out. https://www.cadillacforums.com/threads/how-to-reset-locked-or-stuck-power-running-boards.252809/

 

[Ex Euro Driver]

Did you try flipping the override switch on the dash under the HVAC controls just to see if that has any effect?

I did. Unfortunately no effect.

 

[Ex Euro Driver]

I did this reset on my Yukon and straightened problem out. https://www.cadillacforums.com/threads/how-to-reset-locked-or-stuck-power-running-boards.252809/

Saw that during my internet searches and that would be my savior. No dice. Tried fuses as well. I’m at a loss. Just gonna let the pros handle it from here. Thanks again to all for the ideas

 

[Ex Euro Driver]

Just an update. Finally fixed. I think I was doing the reset procedure incorrectly. Just redid the sequence and the running boards are now working as they’re supposed to