Land Rover LR4 2013, Air Suspension refuse to rise due to vehicle not recognizing the door is locked.
My boss called me he has a vehicle that has been with him for 3 months, I should come take a look or rather fix it. https://twitter.com/biltronix/status/1679996311813206016?s=46&t=NuwWrofBKanDhFlt9qc_-A

Link to videos on my twitter handle

If you’re familiar with Range Rover, if the door is not in closed position, the suspension won’t rise. A lot of parts has been thrown at this vehicle just to make the “door close”, but nothing happened. It was in mess, in bid to solve the problem.

https://twitter.com/biltronix/status/1679996464414482435?s=46&t=NuwWrofBKanDhFlt9qc_-A

First thing I did was to check the vehicle with my scanner, and try to figure out in what direction should I troubleshoot, I checked the data stream for door latch switches.
https://twitter.com/biltronix/status/1679997049931018241?s=46&t=NuwWrofBKanDhFlt9qc_-A

After confirming that we have electrical issues, I fired up my AllData, it’s a paid online database for service information for almost all vehicles, I used it to source wiring diagram for the vehicle’s door lock system.

The door latch switches, are all connected to the Central junction box which is also the body control module according to the wiring diagram, it’s one thing to understand wiring diagram, it’s another thing completely to trace these wires on the vehicle itself

It took quite some time and energy to locate these wires, tested them, they had elevated ground voltages, I had to test the system to see if the air suspension is even working, so, I ran a ground wire to these wires, lo and behold, It recognizes the door is now closed.

I found and fixed the elevated ground voltages, I forgot to take pictures, I was so into the troubleshooting, I forgot myself.
The vehicle recognizes the door is closed, and the vehicle is on it’s 4 legs now.

https://twitter.com/biltronix/status/1679997938284609537?s=46&t=NuwWrofBKanDhFlt9qc_-A

Link to video on my twitter handle