check your valet switch in your glove box make sure its not on they wont operate with it on
There is probably a short somewhere that is supplying power to the circut to "pop" the trunk and lock the doors. Try to find a wiring diagram and locate where the two circuts cross or run close together. I think you need to have your battery checked, when the voltage gets so low this system does this.
a fuse, relay, bad ground or positive wire at switch or solenoid, etc.
I think the cause of ripple voltage would be from a bad ground or capacitve voltage.
Here are a couple of things to try: Maybe the latch is not ajusted properly to fully grasp the lid catch or the switch is feeding current to the latch which would require replacement of the switch.
Defective voltage regulator.
chicken pox
Bad voltage regulator
Most likely a blown fuse
Have the alterntor and voltage regulator checked.
It would if the battery voltage was lowered enough to cause it not to fire.
the RMS value of ac voltage is equivalent in power to the exact same DC voltage. This will cause the same amount of heating in a resistor.
defective voltage regulator