The earlier 5AS (single connector) doesn't have the ability to flash the indicators or control the courtesy light.
It is possible to have it do these functions, I designed two circuits and posted them on mg-rover.org.
The later version also has a "friendly mobilisation" feature wereby a transponder coil fitted around the ignition barrel excites the fob, this in turn transmits and saves you the bother of having to press the unlock key to start the engine.
The two versions of the 5AS are electrically interchangeable, MG-R supplied the two connector version as a replacement for the single.
You would need to fit the drivers door solenoid as it contains the sill up/down switches which are needed to inform the 5AS that the car is locked.
An aftermarket plunger type solenoid can be fitted as long as it has the built in changeover switch.
The other door motors are simply connected in parallel and are not needed.
The other inputs (doors/boot/bonnet) can be grounded or left open circuit as need be.
The horn on both versions is controlled via the horn relay contained within the MFU.
Everything is programmable!
I have a Omitec T4 handheld unit and the Avon Diagnostics equipment (we have 5 Rover cars in the family!) which cover all eventualities!
Keyfob programming is a doddle and takes about 45 seconds.
5AS matching is relatively straightforward, you can either clone the security number from the existing unit and then program this into the new unit or force the MEMS ecu to learn the code from the new unit.
Ask all the questions you need.
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