Well... this isn't a half hour job! eek! I had to take my dash apart to get at the heater controls, and it took 3 evenings to get it aprt, fix it, and get it together again. My 145 is a RHD version with no passenger airbag.
Firstly, pull out the oddments bin under the radio, then the radio and it's metal bracket, then the ashtray / cigarette lighter, then the panel with the hazard light switch on it.
Then take out the strip panel which goes from the passenger door apeture across to the heater control panel; I guess this is the panel which has the airbag on it?
Then take out the electric mirror switch, the rear centre consol oddments bin, and you should be able to get the centre console out, but I found this was the hardest job because it interferes with the bottom of the main dashboard. rant
With the centre console out, you should be able to get the whole lower dashboard out, but I had to remove the steering column lower surround first.
You can now get at the screws which hold the heater panel in place..... this is as far as I got, I could see the control end of the cables, I don't know how much more you have to do to get at the other end!
If you can see a way to reconnect the cable it without removing the dash, I'd advise trying that first.
If I think of any hints, I'll try to post them