2011 Hyundai IX35 Pricing and Specs

When a bunch of electrical functions all go out at once (or within a short space of time of each other) suspicions are always drawn to the car’s body computer. This computer controls all the functions you mentioned as well as dozens of others from the heating and cooling, central locking, lights, wipers, dashboard and much, much more. When the computer starts to die (as most computers eventually do) these functions will start dropping one by one and sometimes in simultaneous batches of failures. Eventually, pretty much nothing will work and the car will not even respond to the key’s inputs.

An auto electrician is the best place to take the car, and as well as the computer, they will also check the car’s battery and charging system and the quality (or otherwise) of the car’s earthing points. Bad earths can cause similar problems to this, but the body computer remains a likely culprit.

With that list of problems, I’d be looking at having the body computer checked, at either a Hyundai dealership or a known automotive electronics specialist. Modern cars have computers to control not just the engine and driveline’s behaviour, but also the functions you’ve mentioned.

Central locking and sunroof problems are classic examples of a body computer that is not playing the game. You might find a specialist can reboot the computer to fix these flaws, but you may also be looking at a complete computer replacement.

But before you do any of that, try this little hack: Lock the vehicle and when you press the button to unlock it, hold the unlock button down for at least 30 seconds. Believe it or not, this can sometimes re-set the body computer and will fix all your problems. It’s a bit of a long-shot, but definitely worth a try.

I would rule out the CX-7 on the basis of poor fuel consumption, the performance of the iX35 petrol version is a little lacking, the Tucson is a better car, but I would suggest the X-Trail is probably your best bet.