2013~2016 Keyless Entry - Weird Issue

[jakeuten]

For the past few months now, my keyless entry and push to start has not worked correctly in my 2016 CX-5. I’ve tried at least 4 different CR2025/CR2032 batteries, and the red light on the fob always lights up, but the car doesn’t unlock when I press the unlock button or press on the button on the door. If I press the button on the door before I press the unlock button on my fob, I can see the car seem to leave some sort of “sleep” state, as the parking brake switch becomes illuminated. After I tap the door button, suddenly the key fob works. I’m also missing the high pitch beep and auto lock functionality. Any advice would be super appreciated. I’ve read quite a few different forum posts but all seem to be different than my issue.

 

[wlong01]

Do you have a second fob and if so does it do the same thing?

 

[jakeuten]

Do you have a second fob and if so does it do the same thing?

No second key, so I can’t confirm how it acts with another.

 

[wlong01]

Does it exhibit the same behavior on the passenger door?
The parking brake will illuminate whenever you unlock/open a door.
Have you had any starting issues, is the car battery old?
A lot of issues go back to the 12 volt car battery. A weak battery plays hell on the electronics.