Originally Posted by SteveGXLS

I did another round of tests today. Before I did any test, I verified the remote key worked fine.
1. Before I started the car, the voltage of the battery was at 12.76v.
2. I then started the car and tested the voltage of the battery. It was at 14.96v.
3. I then noticed the voltage was going down steadily so I kept the multimeter on it. It took probably between 5 - 10 minutes for the voltage to go down to 12.44v.
4. At this point, I seemed to hear the alternator kicking in. The voltage of the battery went steadily back up to 13.60v and it stayed there.
5. I shut down the car but found the remote key not working anymore as it occurred before.

It seems both my battery and my alternator are good. I highly suspect the problem is an electrical issue related to the security receiver unit in the car but I'm not sure how to proceed to diagnose it. I believe it is located behind the driver side panel inside the trunk. Any suggestions would be greatly appreciated!

Originally Posted by Yamae

The voltage 14.96V is too high and 12.44V is too low. Both exceed the high and the low limit. At least your alternator's voltage regulator is not working right.

Originally Posted by Yamae

I'd replace the voltage regulator 27700-50030 manufactured by Denso only. I never will choose any non Denso regulators.