2007 chevy avalanche electrical issues

open and check linkage

Electronic's - BCM - body control module , sensor or switch input to the BCM is bad . Would need testing to find the culprit , checking data parameters to the BCM - Checking DTC'S - diagnostic trouble codes etc.....The vehicle in the video may not have the same problem as yours but shows the electronics & electrical systems involved .
Door Locks Go Crazy 1
Door Locks Go Crazy 2
Door Locks Go Crazy 3

sounds like a security issue, disconnect the neg terminal of the battery for 5 minutes, after you reconnect the battery use the door key to lock and unlock the drivers door. try to restart

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If the electrical contacts that go to the rear door lock are corroded the lock/unlock switch will not work. Spray WD-40 (with the spray wand) from inside the truck into the space between the truck and door on the passenger side. A few squirts near the top and upper side will give enough electrical conductivity to energize the lock.

unfortunately it is probably the lock actuators on all three, this is a known problem on those, I have worked at a chevy dealer for along time and have seen this many times usually due to water intrusion in the connector at the lock actuator, have been lucky a few times and been able to clean the connectors..

It could be the power lock motor. You could have a short or bad wiring harness. Might just be a fuse that connects to both. But since you said it's only the driver side. When the power lock motor is bad it can trigger your alarm because they're wired together.

Hope that helps. Good luck.

maybe check the fuses or a loose wire.

do you hear them trying to lock, as in a clicking noise from them, even though they are not locking/unlocking?

Which is it, 98 Eclipse, or 06 Impala? Either way, your door lock actuator is stuck in the locked position either electrically or mechaically. The way to check this is to remove the door panel and unplug the actuator. If door lock can now be moved then you have an electrical problem (faulty door lock switch or faulty door lock module). If you still cannot unlock door then actuator is mechanically bad and must be replace (usually the case)

The rear doors will not lock with the keyless remote, the drivers master switch