What does the plus/minus button on the chevy malibu shifter do?

Question edited for clarity.
Question moved to model category.

Sorry to hear that happened to you. Try resetting the anti-theft system.

https://www.google.com/search?q=2005+Chevy+Malibu+reset+security

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Here is a video of the removal of the front seats of a Chevy Malibu that is in the same series as your 2005 (this video is applicable for 2004 - 2012 model Chevy Malibu)
https://www.youtube.com/watch?v=2l5xLKNRa2g

If im not mistaken that has a electronic steering which i think is under the dash on the steering column very expensive dealer charged friend of mine 900 dollars to do his.

You don't yourself. The lube change shop or garage can do this (requires special tools or removal of the pan). for a 2005 you're likely in need of a flush. some models can have a dipstick installed, but its not necessary. Unless you have a serious leak of fluid or shifting issues, it's rare to lose fluid. If you are having issues, then start with a flush and inspection BY A REPUTABLE GARAGE. do not use a dealer or transmission shop, they will always find ways to seprate you from your $$$

no because a volt meter uses power and that can blow off the charge they did have connector problems so look close to them

When was it last tuned / serviced?? faulty / worn out spark plugs.

can anyone tell me how much transmission fluid does the 2005 chevy malibu hold after a filter change?

it is the manual shifting option + to shift up - to shift down

i think it stands for traction control. most cars with that say ETC which stands for electronic traction control. if you have a manual for the car it should say what it is.

This procedure will normally cost about $200.00, give or take. just depends on if the airbags are deployed or , if they are malfunctioning.