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I’m trying to retrofit keyless entry to my A238 2020 cabriolet
had a look at the aliexpress ones but wanted to go factory so bought door handles x 2 and internal lock mounting brackets to go with them.
from what i’ve found so far it’s possible to just wire up drivers door that already has antenna fitted so the two wires from drivers door handle need routing to the KG module in right rear of car then code up
can anyone point me in the right direction of wiring diagrams for drivers keyless door locking please.
I managed to get hold of front passenger/drivers door handles
My car is 2020 cabriolet e class 238 but same handles as coupe and i think saloon w213
you also need the inner back mounts
passenger uk RHD is
drivers side uk RHD
as i only plan to make drivers side keyless entry i’ve only bought wiring for right hand side drivers door (uk)
this wiring connects to keyless handle sensor and led door handle pocket led (this goes into green connector front door ecu and will need coding)
same part number fits passenger and drivers side, not sure if four door cars have same loom but would think it will be.
keyless part of loom missing from my car has three wires brown and white go through door connector (29pin x35)
to KGM module in rear
other violet wire in same connector comes from door control unit, at the moment i can’t find what this wire does as it doesn’t appear on any wiring diagrams i’ve found
green connector = door ecu
white 3pin = goes to kgm module in rear
the connecting loom from lock loom to door connector has two plugs
white extends into door connector for lock/unlock signal but as yet not sure on violet wire
this connector is for drivers door antenna
but KG module in rear has pins for passenger front rear drivers rear antenna but no drivers door so again can’t find where the drivers door antenna connects too
this is KGM pin diagram
So basically it’s two wire from drivers side door handle that connect to KGM in rear then two antennas one in drivers door and one in boot/trunk then coding by someone much smarter than me 🤣
but violet wire has me stumped and where to connect drivers door antenna.
if anyone can help i would be very grateful 🙏
quick update
both inner door carrier's have to be changed for new keyless outer handles
This is a difficult as the whole locking mechanism has to come apart to fit
the new keyless door looms are plug and play connecting to door handle led’s, lock/unlock sensor, door lock motor, door control module then onto main door car connector
so getting ready to run the body loom up to KGM in boot/ trunk
after looking at mine it’s not got enough pins for keyless
found what i believe to be the correct one for my car but it’s not new
so not sure if used KGM can be coded or do i have to buy new ?
No worries, it can be coded if is Second hand. The Keyless module doesn't handle any security, just forward the signals from each side antenna and capacitive sensor.
4 wires from each door to module
And besides handles, antennas, support for handles you have to be sure that the magnetic part - from the fixed part of the handle - should be installed as well
so now even more unsure my original KGM has Q1 that doesn’t support keyless entry the new one that does has Q2
My front centre console antenna already fitted has Q1 but boot/trunk has Q3
They all have same part number A2059053005 but is Q part relevant ?
Done a bit more of the wiring today, had a look at the centre console antenna.
Different part number and connector to doors/ rear.
So decided to get all the wiring in drivers door connected and run the loom to KGM
Before
After (Antenna wiring)
So today i finished off the install, all wired up and tested, did a quick obd scan, just showed one fault within KG module, thinking this could be because it’s not coded to my car 🤞
And as i’ve had half the car apart, interior was very messy so given her an Ocd clean 🤣
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