Hello everyone,

I have been searching the possibility of installing Keyless GO into my GLC250 that came without option 889, and would like to share the part numbers and information I have learned so far.
I searched the WIS/ASRA/EPC service manual and downloaded some of the main schematics and wiring diagrams to support the install.
The general opinion is that it is possible but too expensive. My goal is to demistify it (if it works and does not reach a too expensive number) and may be implemented with used parts, and according to your budget (e.g. you could go without buying all parts, some not essential like the 3 other handles).
Based on used parts from ebay I am trying to determine the real cost and the list of parts that are required.

In the GLC the system works through 4x keylessGO door handles (some other models have just 2, maybe we could go with minimum 1), 4x KeylessGO antennas (trunk, front, rear doors), 4x door modules that support keylessGO (maybe not necessary - this is just the "illumination"), keylessGo module at the trunk (essential, heart of the system), start stop button (if you want keyless start/stop). Is the car key different? (around USD100 - don't know yet if it is different from regular one).

The door module wiring diagram indicates that the door handles go into the door modules, but it is only for the illumination, maybe it can be left out.
The wiring diagram for the keyless module shows the door handles going into it, so I am considering that the capacitive sensor is handled by the module.
The keylessgo Module is powered via the 12v fuse 460. Grounds are in pins 9, 10, 11 and 12. The other connections go to the FM antenna amplifier, to the rear switching module (if equiped), to CAN B, to the 4x antennas, to the 4x door handles.
The plugs are already there, so I will have to check if the pins are available. The door handle goes to the door connector.
I am considering that the minimum for keyless entry (not keyless start) would be to buy the module, the 4x antennas and 1 handle. The overall cost for my test is of around USD220 ( = 100usd handle + 20usd wiring +20usd 4xantennas +30usd module + 50usdOBD activation tool) + shipping. Not sure if it will work, but I have ordered the parts and will try!

Has anyone tried to do this? Once parts arive I will report the result of my project.

I decided to buy the handle from Aliexpress for USD100 : https://www.aliexpress.com/item/4001059459142.html
They have the hole set on offer (including the module, the antennas, the wiring) and it comes with installation instructions. There is an activation process that needs to be done that will change parameters in the car computer (they have a pre-programmed OBD tool for that purpose). This is the obscure part. I am not sure what is changed with that tool.


keyless go system:

Door handles:
a17/3, a17/4, a17/5, a17/6:
MERCEDES-BENZ GLC X253 Front Left Door Exterior Handle - A0997601900 -** carefull here -> Right Hand Drive (UK, Japan, etc) A0997602100
Mercedes Benz GLC X253 Front Right Exterior Door Handle - ** carefull here -> Right Hand Drive (UK, Japan, etc) A0997604600
MERCEDES-BENZ GLC COUPE X253 W253 Rear Right Door Exterior Handle A0997602200
MERCEDES-BENZ GLC COUPE X253 W253 Rear Left Door Exterior Handle A0997602100

The part numbers above are for the "bearing brackets", not the "door handles" itself, and there are alternatives for each, as many cars use the same. Ebay lists them in several ways, a search and better confirmation is required
-----
Antennas
( connected to the keyless control module):

4x antennas:
a2/35 - trunk keyless go antenna
a2/39 - left rear door keyless go antenna
a2/41 - right rear door keyless go antenna
a2/60 - center console keyless go antenna

4x
2017 MERCEDES BENZ GLC220 X253 RHD KEYLESS GO ENTRY ANTENNA OEM A2059053005

----

Keyless GO module:

n69/5

ORIGINAL Mercedes Benz C W205 Keyless Go Entry Access Control Module A2229004213
100- CONTROL UNIT/ KEYLESS GO A2229005412 / Replaced by: A2229004213

---
Start-stop button:

110- PRESSURE BUTTON/START-STOP SWITCH
A2215450714
alternative A2215450814


----
Door modules:
(essential?)
According to the door modules pinout, wires for illumination of the door handle go to the door module, but apparently these are not required (still to be confirmed):

pins 1 and 10 of connector 7 (same connector as front door lock a85 m1 s1 m4)

door control unit:
n69/1, 2, 3 & 4

My GLC (without keyless) has the following modules: a2059000228/a2059000528/a2059000728/a2059000928 (not the same for keyless)

left front door control unit:
without keyless - A2059000528 / A2059003921 replaced by a2059002822 ... apparently does not work
there are several other options

-> part numbers with keyless A2139002022 + a2139002422
+ X replaced by A2229009812

right front door control unit:
a2229001712 replaced by a2229000013
X replaced by a2229001614

rear left door control unit:
replaced by a2229001814

rear right door control unit:
replaced by a2229002014

----
Door wiring:
(essential?)

door electrical wiring harness (with plug for the door handle) - not necessary but would be easier
A2055402431 front
a2535400810

----
Amplifier

A2/18- FM AM CL and keyless go antenna amplifier - is it required to replace?

-------------

PINOUT FOR KEYLESSGO MODULE

PINS FUNCTION
1 GND
2 NOT CONNECTED (N/C)
3 CAN-B LOW
4 N/C
5 TRUNK KEYLESS ANTENNA - LF ANT HNT1
6 RIGHT REAR ANTENNA - LF ANT R1
7 LEFT REAR ANTENNA - LF ANT L1
8 CENTER CONSOLE ANTENNA - LF ANT INNR1
9 GND (FOR RIGHT REAR DOOR HANDLE)
10 GND (FOR LEFT REAR DOOR HANDLE)
11 GND (FOR RIGHT FRONT DOOR HANDLE)
12 GND (FOR LEFT FRONT DOOR HANDLE)
13 N/C
14 N/C
15 12V SUPPLY - FUSE 460 IN REAR FUSE AND RELAY MODULE
16 N/C
17 CAN-B HIGH
18 FZV (PIN 3 FROM FMAMCN ANTENNA AMPLIFIER)
19 TRUNK KEYLESS ANTENNA - LF ANT HNT2
20 RIGHT REAR ANTENNA - LF ANT R2
21 LEFT REAR ANTENNA - LF ANT L2
22 CENTER CONSOLE ANTENNA - LF ANT INNR2
23 RIGHT REAR DOOR HANDLE - KPS-HR SIG
24 LEFT REAR DOOR HANDLE - KPA-HL SIG
25 RIGHT FRONT DOOR HANDLE - KPS VR SIG
26 LEFT FRONT DOOR HANDLE - KPS VL SIG
27 N/C
28 REAR SWITCHING MODULE (IF PRESENT) - LIN B27 (PIN 1)

--------------------------------
module
VIEW PER ELEMENT:
PINS FUNCTION

15 12V SUPPLY - FUSE 460 IN REAR FUSE AND RELAY MODULE
1 GND

17 CAN-B HIGH
3 CAN-B LOW

----
24 LEFT REAR DOOR HANDLE - KPA-HL SIG
10 GND (FOR LEFT REAR DOOR HANDLE)

23 RIGHT REAR DOOR HANDLE - KPS-HR SIG
9 GND (FOR RIGHT REAR DOOR HANDLE)

25 RIGHT FRONT DOOR HANDLE - KPS VR SIG
11 GND (FOR RIGHT FRONT DOOR HANDLE)

26 LEFT FRONT DOOR HANDLE - KPS VL SIG
12 GND (FOR LEFT FRONT DOOR HANDLE)

-----
18 FZV (PIN 3 FROM FMAMCN ANTENNA AMPLIFIER)

5 TRUNK KEYLESS ANTENNA - LF ANT HNT1
19 TRUNK KEYLESS ANTENNA - LF ANT HNT2

6 RIGHT REAR ANTENNA - LF ANT R1
20 RIGHT REAR ANTENNA - LF ANT R2

7 LEFT REAR ANTENNA - LF ANT L1
21 LEFT REAR ANTENNA - LF ANT L2

8 CENTER CONSOLE ANTENNA - LF ANT INNR1
22 CENTER CONSOLE ANTENNA - LF ANT INNR2
--------
28 REAR SWITCHING MODULE (IF PRESENT) - LIN B27 (PIN 1)
--------
2 NOT CONNECTED (N/C)
4 N/C
13 N/C
14 N/C
16 N/C
27 N/C

 

some more attachments.

 

It will eat your wallet. Don't do it. If it really is a deal breaker, you can trade in.

 

Did you manage to get this going ?

I am interested in a CAN-B connection and looks like this might be a clean solution - I looked at the PDF but don't see the exact location of the control module. The auto engine start/stop feature drives me nuts - I know there is an eBay seller that allows it disabled for about $200, but I am thinking of adding a macro feature to the car, so that not only will it disable that feature but will do many other things e.g. if the outside temp is below X turn seat and steering wheel heat on. In any case this might be a fun CAN-BUS project.

 

I think it's great. Has anyone installed it?

 

I buy aftermarket keyless go with remote starter for 303euro! Works perfectly!
The only hard to do is to solder 4 wires in the EIS.

 

did you get this working ?
i'm doing same install on e class a238 but struggling with one wire