DS7 Dead electrical fault, anyone experienced similar?

[Fix It Again]

I have a DS7 2019 1.6 Petrol Automatic.

Was starting driving fine, until I stopped to go to a shop and the car never started again.

Got in the car Pressed the Start/Stop button and nothing came up, just a flash on the dash saying "Turn The Steering Wheel To Facilitate Unlocking" Strangely enough the steering wheel is not locked.

Since this noticeable things:

The Car locks / unlocks
Car Does not start, even Ignition does not come on.
The same Steering wheel message comes on and screens flash and turns off. When you open the door, or turn on emergency lights.
Electric Windows do not work
Cannot Change gear
Cannot Release the Parking Brake
Steering wheel can be turned, although the message says it is locked?
Stop / Start Button slowly pulsing red, when inside the car with key

Things we tested:
Battery / Replaced with new just in case
BSI Reset by doing the steps. Except the window open as they do not so opened the door.
Checked all Engine Bay and Behind the Glovebox Fuses.
Visually checked main Harness for any breaks, damage - Negative
Snap-On diagnostics: Not connecting to Gearbox Module / ECU / ABS
Snap-On Diagnostics codes:
U1F53 Absence Of Communication With The Electric Steering Lock - Missing Message
U1F67 Absence Of Communication With The Signaling Fuse Box - Missing Message
U1F3A Fault: Absence Of Communication With The Windscreen Wiper Motor - Missing Message
B1808 Fault In The Unlocking Of The Immobilizer By The Engine Management ECU - Missing Message

B116C Known Previous code Regarding Read Light ( Light unit was replaced by dealer Recall)
B1727 Known Previous code Door Contactless entry not working ( was like that for a while )
B1418 Fault In The Status Of The Seat Belt Fastening Information For Determining The Presence Of The Driver

Last check, we checked that there is no Positive charge going to ECU connector.

This just happened with no warning, no previous issues, nothing at all, as mentioned before just drove to a shop, parked turned off the car and this happened.

Any ideas, or has anyone experienced something like this? Please let me know. Not even sure how to proceed.

[mickthemaverick]

Have you checked the ECU connectors for dirty or corroded pins?

[Fix It Again]

Yes, of course. No signs of corrosion or dirt or any signs of something bad there.

[PaulC5]

Have you checked the maxi fuses which are often under the main fuses in the engine bay ?

[Fix It Again]

Have you checked the maxi fuses which are often under the main fuses in the engine bay ?

There are none under the Fusebox in the engine bay, but we checked all and the ones behind the BSI fuse box behind the glovebox.

[Sloppysod]

As per normal, looks like you are not the first.
It turns out the DS7 has history of mis-behaving like you have described.
Read through this, but I have no idea how you go about checking the electronic steering lock.

Why it makes sense ...... The last thing you done before getting out of your car at the shops was turn it off, therefore, engaging the steering lock.

https://dsforums.net/t/help-newbie-please/335/7

[Fix It Again]

As per normal, looks like you are not the first.
It turns out the DS7 has history of mis-behaving like you have described.
Read through this, but I have no idea how you go about checking the electronic steering lock.

Why it makes sense ...... The last thing you done before getting out of your car at the shops was turn it off, therefore, engaging the steering lock.

https://dsforums.net/t/help-newbie-please/335/7

Thank you for sharing this, this helped find the solution

[Fix It Again]

Solution Found:

Thanks to "Sloppysod" for sharing the link to other forum that gave hints.

In there another person had similar issue and had replaced steering column lock.

however we believe a quicker fix was this:

The steering lock got stuck, possibly the wheel was right up against the curb and due to this the car though it is being stolen so all systems went to off mode.

All we did is using snap-on connected to steering lock activated it and did actuation test basically turning the steering lock on and off few times, and all of a sudden all car just went back to life.