There was a discussion about this on an earlier post and its quite common for the connector in the wiring loom in tail gate or rear quarter panel to either corrode or come apart. Worth a check.
welcome to the club Boroboy
Checked all connectors, no corrosion or power supply to them, with ignition on or off. Light on switch.
I bought him an officialKIAworkshop manual a few months ago, states that there are 3 or 4 relays together in a line within the front A pillar. One being the heated rear windscreen. Just struggling to find them. If I do, I'll let you know.
Hi Boroboy, I've just checked my '05 1.3Le and the switch only works with the engine running (well done M4trundler) and the relay has a loud 'click' which is coming from somewhere just behind the switch itself. It is easy to remove the facia (I changed the radio a while ago) as it just pulls off being held in place by clips. The earlier models have a single screw behind the ashtray. On my model the rear screen demister also demists the door mirrors.
Best of luck.
I bought the manual off fleabay a few months back, as could not get hold of an Haynes at the time. Will let you know when he finds the relay. There is a black type box near to theA pillar drivers side, may be behind that. He has tried the feed with the ignition on & off. No power to connectors from switch.
No relevance. He changed the elec drivers side window motor six months ago, he was surprised how cheap the motor was from dealers. Took him a while to take door facia off, managed eventually.