Since I've ordered Keyless version of handles for my friend (because he has Keyless) I've been investigating whether it is possible to activate Keyless handles in the rear doors. Short answer? Yes! Long answer? It depends...
There were two Keyless modules installed in the
Leon MK3: 5Q0959435X or 3Q0959435X (from 30.07.2018). Main difference between those two modules is the amount of pinouts (32 vs 40). I've investigated wiring diagrams to determine which pin does what and I've found that 5Q0 modules does not support rear door antennas. Unfortunately my friends car is from 03.2018
As far as I can determine from wiring is that 3Q0 modules has two main advantages above 5Q0:
- they supports rear door handles Keyless antennas/sensors (pins 3/4/13/25/28/29)
- they supports electric trunk lid (pins 2/16)