360 CS Alarm System / Locking Issues

Today my CS had a somewhat unpleasant surprise for me, so I'm asking for your help in diagnosing and fixing this issue (or these issues, if there is more than one). Any help would be greatly appreciated.

Symptoms:
- fobs don't lock/unlock doors anymore
- LED on the dash is blinking fast
- pressing the button on the fob makes the light flash even faster
- there is a 'switching' noise audible when pressing the button on the fob; it seems as if this noise is originating somewhere behind the seats
- hazard lights are flashing constantly and won't turn off
- no beeping sounds etc.
- car will crank and start
- windows won't move

- passenger side can be locked and unlocked with the key; key rotates normally/smoothly
- driver side can be locked but NOT unlocked with the key; key does not rotate smoothly at all

- no errors messages visible (Launch X431)

Attempts made so far:
- tried second key/fob -> same results
- battery switch off for more than 30 minutes -> no change

How it happened:
While I was washing the car, suddenly the driver side window lowered to the "open door" position, so I went and got the key. I had to press the button on the fob a couple of times until the doors would unlock. I put the key into the ignition, closed the window, closed & locked the door and continued washing the car. When I was done, I tried to unlock but the doors wouldn't unlock and the hazard lights came on.

As stated above I would be really thankful for any assistance how to solve this. Thank you!

 

I will try that tomorrow (currently all stores are closed).
I'm not sure if that is the issue though since both fobs were working well before (one of them 60 minutes earlier).
And the car does react to the fobs (LED blinking speed increases momentarily, and switching noise is heard from behind the seats).

The cars battery is brand new (routine replacement; less than a month and less than 1000 miles old). Car is on a trickle charger when not being driven.

 

Neither window will react to opening the door or pressing the window buttons.

 

With the doors and lids closed the panel displays only the triangle symbol (hazard lights I assume), but no open door/lid symbol.

With the front lid open, the "front lid open symbol" is displayed (ignition on).

With the rear lid open, the "rear lid open symbol" is displayed (ignition on).

Opening either door will show the corresponding symbol on the display (ignition on).

Letting the car sit overnight (main battery switch off) did not improve the situation.

 

No, the hazard switch was not pressed. Pressing it, seems to change the "blinking noise" inside the car, pressing it again returns to the lower "blinking noise" level.

I suspect that the lights are part of the alarm system. I do not have any siren/honking/beeping which leads me to believe that the siren is defective or was disabled by a previous owner.

 

Withe battery of and a small amount of WD40 applied, the driver side lock still feels considerably stiffer than the passengers side

 

I did not see this symbol, or any other symbol except for the "check ok".

In the meantime there is some progress:

I heard the central locking mechanism while i was in the car.
Windows came down to the open door position on their own and after some fiddling with the window switches I was able to move the up/down manually.

I was able to lock/unlock the doors using the fob, albeit not reliably. It would unlock and when I try to lock it would lock and immediately unlock. Then the fob stopped working and the car was locked.

After several seconds the car unlocked on its own and moved both windows down (open door position). Hazard lights (alarm?) Still on and wont turn off.

 

I locked/unlocked a couple of times with the fob (which seemed to work) and then the fob stopped working while the car was locked, i.e. the fob would no longer unlock. Had to unlock with key (passenger side). Turned the battery off.

I went to buy batteries for the fobs. When I came back, I turned the battery on, heard the locks do something, but fobs no longer work. Put a new battery in the red one. Behaves exactly like both black ones.

Windows wouldnt move by pressing the buttons.
After roughly 1 minute driver side window started coming down on its own.

At the moment I can not work on the ECU & fuses, because the car is in a place where i can't open the door wide enough. Will take some time to move the car to a better location.

I did not see or feel signs of water intrusion near the ECUs; everything feels dusty.


What puzzles me most is this: why are the hazard lights on and won't come off?

 

Pressing the fob continuously for a roughly 30 seconds solved the hazard light issues.

Windows are working normally again. Fob tries to lock the car, but it locks and immediately unlocks.

We are getting closer.

 

This time just the driver side and it opened half way, while on the previous event both opened only an inch.

It felt like the driver side window was reacting to my inputs on the window control, but with a giant delay.

 

Half way to fully down, so roughly 5 inches. Windows seem to work now. The main symptom that is left is that the car won't stay locked. It locks but immediately unlocks again ...