So I'm breaking in my '05 TL and tested out the 2nd keyfob from the previous owner. The key works, but the keyfob part is dead (unlock, trunk etc). Not a big deal, the battery tests dead so I replace it. I figure it would work, but nope. Make sure my other keyfob still works, but the 2nd one appears to be dead. I tried the sync methods, and that's a no good. The LED light doesn't light up when pressing the button. I took it apart, and nothing appears broken - no corrosion or missing capacitors. The labels are worn off the but insides still click just fine.

Any ideas? Probably not that much that can be done, but I thought I'd ask. Is there a recommended replacement that I can get for cheap?

 

FWIW: First, you should determine which key fob is inoperative, Is it #1 or #2. Once you figure weather it's #1 or #2, you can order an OEM fob on Ebay for less than $25.00. IMO, it's probably not worth the effort to attempt to repair yours.

 

Thanks for the tip. I did find used ones on ebay, but it made me think on how someone else is refurbishing them.

Soooooo, for anyone interested - try cleaning the battery contacts first. Mine looked fine, but the 3 prong tips (the negative size) were covered in corrosion upon closer inspection. Since it's just the smallest part of the tips, it's really hard to see. Normally I would clean them with Isopropyl Alcohol, but I'm out and settled on MAF sensor cleaner as a substitute. Really, I'd think any electrical cleaner should work. A few sprays and scrubs with a Q tip and the remote is working again - Hooray for the red LED.

Cheers!