Kessy entry retrofit

Hi kkpr3,
could you tell where you ordered the parts. I see these aliexpress sets, but I dislike the design of the handles with that chrome strip... Did you opt for a new kessy ECU or can a second-hand unit be used (i.e does that module have component protection?)

Hi, no CP removal necessary.

The Ali kit won't fit correctly. Even the connectors are different.
You must trim the connectors and swap the pins.
Or keep your stock handels and move the sensor inside along with the little wiring and add the pins in the stock connector (from the handle to the door).

I did everything on my own using the factory parts (took a lot of time but no spare parts around),also this way it was super cheap.

Still stuck with the coding though. 

Hi kkpr3,
I hope you sorted out the coding I am still stuck in the retrofit phase and would appreciate your help. Could you share the wiring diagram for the kessy module? All the wiring diagrams available online (atleast the ones I found) only show wiring for the front doors, not the rear ones. Would you know where to pin the two wires for the sensors in the rear door handles?
Also, what is your experience with accessing the kessy module? Did you remove the dash or did you find a way how to approach the module without extensive dissasembly?

Thank you for the hint. I found it and wired according to the Octavia IV schematic. I am still having issues with coding, though, hopefully to be resolved soon. The car senses my touch to the handles by turning on the welcome lights but it does not unlock.

brkica i have a small update.
Today I flashed the datasets and now the car is error-free... but guess what? The keyless entry still does not work.
I am searching among the adaptions to see if i am missing something. 

Hello guys !

I'm wondering why you are struggling at this point

I will simplify the retrofit as i did it before for many Golf 8

All you need is :

Wiring done with touch handle and 2 big antennas and all with Kessy modul B7

Replace Kessy module

Coding central electric 09
Dataset flash to Kessy module B7

Job done

Hi crow,
please share your coding for 09, it would be really appreciated. As for the B7, I currently have a dataset from a Golf 8 with a different VIN, so I have currently a version mismatch error in the 09. I've been struggling with the issue for a long time, could easiliy be that I overcoded something, even though I used several coding backups of vehicles with the feature as reference.

I did go into the retrofitting hoping it would be as easy of a retrofit as in MK7's, sadly took way too much effort and energy.

New update:
IT WORKS!

I flashed the whole datasets and coding on both 09 and B7.
No errors so far.

Finding the single pieces to manually set it up was too complicated and i had enough  

I've sent you the VIN of one of the cars where it worked.
Only thing to manually fix are the Licht Channels (in my case).

They were completely different because the car is older.
Just take a full backup of your adaptions.
Oh, just to let know, it will be a hard time to work during the coding. Expect A LOT of warnings and cross your fingers! 

I didn't bother too much because i need to replace the BCM anyway with a newer version, so...

Hi, 
for installation follow these steps:
- Install door handles - will require almost complete door dissasembly and glass removal. Lay new cables taking care that there is sufficient clearance from the cable to the glass. Wire to door coupling points (wiring diagram attached)
- Dissasemble the complete dashboard. Everything has to come out as the module is in the top left corner just bellow the windshield.
- You have to wire 4 additional SIG wires (4-door kessy) or 2 (front door Kessy only) from the door handles (via door coupling point) to the kessy module (wiring diagram attached)
- Flash fiwmware to the Kessy-IOmodule (from a VIN with Kessy from factory) - not possible with OBD11
- Upload Appropriate dataset  to the Kessy-IOmodule (from a VIN with Kessy from factory) - not possible with OBD11
- Flash appropriate dataset to the Central electrics module (from a VIN with Kessy from factory, must be same VIN as for Kessy-IO module, otherwise you will have a VIN mismatch DTC in central electrics) - not possible with OBD11
- Code according to attached document or restore coding to "Passive_comfort" channels from a car with Kessy from factory (latter not possible with OBD11)
- Readapt the 2 keys to the car - seems not to be mandatory, but a memory block on the Kessy module only gets written after the re-adaptation procedure, so it does something - ODIS online needed
- After coding, close and lock the car (remove the key from the car's vicinity) and leave the bus to rest for 15-20 minutes.
- In Central locking menu in the HMI you should now see new options for Advanced kessy - make sure they are on  
- You should have now full kessy functionality- the car should unlock while approaching and you should be able to lock and unlock it just by touching the door handles while the key is near.

NOTE:
- Automatic unlock while approaching works, but is not very consistent - the key must be unobstructed (i.e not in pocket, purse, backpack)
- Automatic walk-away locking does not work or is terribly inconsitent - reccomended not to code it
- 4-door kessy does not work, MK8 only supports front door Kessy as it came out from factory like this. That is why you won't find wiring for the rear handles in the MK8 wiring diagrams. You can wire the rear doors according to Octavia IV wiring diagrams, but even after coding it, the Kessy module does not recognize the sensors in the rear handle (seems to be a limitation of the firmware/dataset). I am currently investigating how to enable rear door Kessy functionality as well, if even possible. Will post an update if I find a solution.


Files:
Kessy_coding.txt (8.43 KB)
Kessy_wiring_1of2.pdf (1002.82 KB)
Kessy_wiring_2of2.pdf (984.25 KB)

Hope this helps! 

Best,
A