ginall

Hello,
We are fighting with glc w253 43 amg
Car came completly dead , we started it after changing multiple of electric modules.
Now everything work as it should , dead zones , radio , clima etc.
Only thing left and we dont know what to do is :
I can close car with remote key and open it untill car goes "sleep"
If i close and car go "sleep" when i push anything on the key car starts to turn on front lights and wont open doors / boot.
I have to open it with physical key inserting into doors then car wake up and work as it should till i close it and car go sleep.
In time car is slept and closed, sometimes it turn on headlights for +- 30 sec and then turning off.
Can someone help me with this issue ?
Thank you

CaliBenzDriver

Can you pls give us a full chassis scan?

1- It sounds like KeylessG got issues, perhaps one of its multiple antennae got thundered

2- F-SAM is in charge of power across the whole chassis.

ginall

There are No obivious errors,
yes , left keyless handle is broken But even if i disconnect whole left door problem is comming back.
keyless go is working too on other handles untill car go sleep, everything work untill it go sleep.

Front sam has been changed too.

I can open / lock car how many Times i want But if i close it and wait 3 min (car go sleep) i cant open it with remote key (No reaction or Just front lights flashing)


is there is another way to make car wont go sleep ?
tomorrow i will share here fault codes

Or maybe you want to scan it online?

CaliBenzDriver

These are not the usual garden variety faults because of thunder strike.

Let me remind you that no code is not always fine... dead modules are silent!

Have you located or used the CAN bus bars at footwell/threshold?? Use that to help you troubleshoot your low-power sleep issue.
MARK WIRES POSITION then unplug non-essentials,
keep R-SAM as it connect KeylessG
keep one working door to witness activity