Keyless Entry, Keyless Go and "A7" key on A8 D2

[Adrian E]

Too many interventions with the factory security (even though it is easily defeated) for me to be comfortable with.

The start/stop button looks like one from a B8 era platform. I presume it's too difficult to do this using factory modules from later cars? Some A6s I've driven have had keyless go, but not keyless entry, so might be a suitable basis but I imagine the fibre wiring rules it out, unless the security side is wired traditionally?

The way it works in later cars gives the start/stop button different functionality depending on whether you have your foot on the brake or not. Foot off = ignition on. Foot on = engine start.

Don't much like the idea of defeating the mechanical steering lock, which I assume would have to be removed for this kind of install. The B8 has an electronic steering lock.

[MikkiJayne]

Hmm good point about the steering lock. That's technically an MoT requirement, although I don't recall ever having seen it tested! I think adapting a more modern electronic one would be quite a challenge. Mechanical locks often require some tension releasing from the column before you can turn the key, whereas electronic ones can't do this so they must be designed differently from the start to ensure there is never any mechanical force which can prevent them disabling.

Given that the usual method of stealing cars like this is to break in to the corresponding house and take the keys, I'd be less concerned about adapting the factory security stuff for some added convenience I like Ainars' solution with a remotely positioned transponder. You'd still have to defeat the aftermarket security in that case, and if its a decent system which is well installed (ie carefully wired in out of sight rather than a cluster**** of scotchlocks and sticky tape under the steering column like most aftermarket fitters used to do) then that's no more or less easy than defeating the factory stuff.

The brake pedal logic would work well.

The keyless go in the D3 relies on the security modules giving the ECU authority to start the engine - its quite a complex digital sequence to make it do this so unless you transpose most of a D3 in to a D2 I don't think adapting something from another model is feasible in this case. Its likely to only be possible using mostly aftermarket stuff.