[Mobilemechanics]

I am currently trying to replace a damaged terminal 51 via x3 connector on the x50a fuse box (under hood) I was able to get the white plastic cover to lift up a couple cms via the release tab in the center but I can't remove it without what feels like breaking it. I need to remove the terminal and I can't figure out the release

Photos and relative connector info below

 

[greentraverse]

My experience is that you need to insert a jewelers screwdriver or an unfolded paperclip or other small pointed object into the "slot" in the white plastic below the female terminal in the the pic where you've circled it. When the terminal is inserted from the back side, it has a small tab that sticks out and engages a small "step" that then prevents the terminal from sliding back out. You need to force that tab back towards the terminal itself to release the terminal. You usually need to push the terminal farther "into" the body of the connector so the tab moves away from the "step" and you can push it back up against the terminal. Once you've got the tab against the terminal, you should be able to pull it out.

I don't have a pic of one, but here's a sketch:

 

[Catattack600]

I would invest in a terminal tool kit.

Amazon.com: Terminal Removal Tool Kit 82 Pcs Depinning Tool Electrical Connector Pin Removal Tool Kit Pin Extractor Tool Set Wire Terminal Release Tool for Automotive Car Household Devices : Automotive

Buy Terminal Removal Tool Kit 82 Pcs Depinning Tool Electrical Connector Pin Removal Tool Kit Pin Extractor Tool Set Wire Terminal Release Tool for Automotive Car Household Devices: Electrical System Tools - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

Trying this without the right tool may work and I have also done it but with today's electronics you could create other gremlins in the pins of periodic contact.
Try the Amazon link for the tool.

 

[Mobilemechanics]

I already have the tools I tried using the pick that fits and made no progress

 

[greentraverse]

Do you have a new terminal to replace it with once you get it out? If so, eyeball it carefully to figure out what you need to do to remove the bad one.

 

[repairman54]

Many times you have to push the wire side into the connector to take pressure off the locking tab while pushing the release tool in from the other side. Lots of experience with connectors in my previous life. If melted bad enough it can be a cut apart surgery to replace the female connector.