Smart Key not starting car after battery replacement

Hi!

I replaced the battery of my fob with a brand new duracell 2032 with positive side up (i am writing every detail so you don't think i messed it up.). All the buttons on the fob work. The red light is there. I can (un)lock the car without pressing the buttons (smart entry or whatever it's called works.). However, the car won't start unless i put the fob into its slot. I searched the forum and saw that some people solved their same problem by pressing the key button under the steering wheel. My button is unpressed (sks on) as it should be. I checked the 12v battery and it's in perfect shape. What is going on, any ideas?

Thanks!

 

yes, exactly after the battery replacement. i am positive nothing has fallen out. I did the whole thing on an empty table, and i was very careful.

 

Yes the red light lights up only when a button is pressed. And I tried cycling the key button. It didn't help. It is in the out position. I do have a second fob that i hadn't used in years. I replaced its battery to try if it works. And that fob is completely gone for some reason. Its red light doesn't even light up even after a brand new battery replacement. I checked for oxidation but nope, clean as a whistle.

 

that's actually not the worst idea. however, that battery is looong gone.

 

hmm. my roommate takes the voltmeter to work. I should try that when he gets home.

 

the battery is good. anyone?

 

Oooooh! This is great! I can buy it on ebay for like $8. I didn't know about this. Thank you!

 

No. 3v.

 

i'm sorry i am an idiot. voltmeter reading was 3.3v. for some reason, i gave you the number on the package.

 

unfortunately, that's not it. it was one of the first things i tried. btw i got my other smart key working and it does the same thing. it's like the car itself lost its programming or something. anyhow have a similar experience at all?