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Discussion Starter #1
I know this forum is for Mazda 3s and I have a CX-5 but I think the cars are similar enough that people here might have ideas on how to solve this and this forum is much more active/knowledgeable than any other forum I'm aware of.

I'm having an odd issue with my 2016 CX-5 after installing an amplifier and subwoofer using a PAC line out converter. I did not splice into any factory wiring and always had the battery disconnected during the installation. I've since disconnected all of the above and the issue remains. Sometimes this behavior happens immediately on startup and sometimes it happens 2-5 mins after start up (and once they occur, they don't resolve until the car is turned off, which only sometimes works).

The set of issues (they all occur together or not at all):
1. The fuel/trip display turns does not turn on (or turns off)
2. The Security Indicator Light continues to flash (even after the the car is on)
3. The Key warning light illuminates red
4. The reverse camera does not kick in when in reverse. The infotainment screen otherwise works normally.
5. The indicator light on the gear selector (to indicate which gear the car is in)

Car has no issue starting. Battery is strong. Thanks for your help.
 

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Discussion Starter #3
I've fixed the issue and I'm fairly certain what caused it.

Because of the keyless entry system that automatically locks the car when exiting the vehicle, I found that I had to use the physical key inside the fob to unlock the car after disconnecting the battery. I think the car didn't like that and it somehow tripped the security system. I was able to resolve this issue by disconnecting the battery for ~20 mins before reconnecting.

After a day of verifying the issue was resolved, I went back and re-connected the subwoofer and PAC adapter but this I made sure all the doors were unlocked before disconnecting the battery (and therefore didn't have to us the physical key) and sure enough the issue did re-appear.
 
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