Ok, some much needed updates, with much help from a friend that is emailing me updates on his progress...
The HCE module appears to use a 93C66WP EEPROM.
So hopefully we can work out locations for setting Single/Dual/Triple Zone operation.
Next, if you swap only the radio head unit (And fascia), the HVAC blower motor will run at 100%, and there will be no HVAC control from the head unit.
However, if you fit a HCE module, from an Auto Climate Control Model, things will work, but a Service Vehicle Soon DTC will be displayed on the instrument cluster.
The next step is working out what sensors are required to fit to the vehicle to remove these DTC...
(External Ambient Temp doesnt work, so that sensor will need to be added)...
I have basically dumped as much information from the workshop manual as I can, to the following page...
ve-factory-hvac-information-t13637.html
I am going to try and get the Connector information for the HCE module, so as we can work out what needs to be wired in where to get things working...
Will keep everyone posted...
Cheers