Thread: Touchpad and Steering Wheel Controls (Toyota Corolla 2001 european edition)

Originally Posted by nrgizerbunny

there are a series of resistors in the steering wheel control. so a different voltage gives a different output. only way i think you can find out is with a circuit diagram or with a multimeter.

OK, lets say , that I foind oout the outpouts. Then how can I connect with the 3 wires of my system?

The 3 wires are :

+3,3 V
GND
AD

what is AD?

Originally Posted by nrgizerbunny

what is AD?

I think that is the wire , whitch it has the sognal , for the operations.

tricky one,

i've got an 05 corolla which has a similar set up. I had to connect ground to one wire and the +3.3v to the other 1 wire (its only a 3 wire system) and the sense to the final wire. Each time you press a switch you are going to get a different resistance coming down across the two ends. Just check to see if you have a ground there anywhere to start off with. If you haven't it doesn't matter which way you connect it up.

Originally Posted by nrgizerbunny

tricky one,

i've got an 05 corolla which has a similar set up. I had to connect ground to one wire and the +3.3v to the other 1 wire (its only a 3 wire system) and the sense to the final wire. Each time you press a switch you are going to get a different resistance coming down across the two ends. Just check to see if you have a ground there anywhere to start off with. If you haven't it doesn't matter which way you connect it up.

Thank you for your answer.

But I don't understand what you said to me. Could you please explain to me better?

Thank you!

there is one wire that goes to the touchpad, this provides +12v, one wire is ground. Now in my case the remaining wire is used to sense the voltage drop. I think yours has two to sense the voltage drop. hope that makes sense.

Originally Posted by nrgizerbunny

there is one wire that goes to the touchpad, this provides +12v, one wire is ground. Now in my case the remaining wire is used to sense the voltage drop. I think yours has two to sense the voltage drop. hope that makes sense.

OK I understand. But I have a couple of questions

First of all the wire from my head unit says +3.3V . Where should I connect it?

Second , There are 2 wires for control and the head unit has only one. What could i do for that?

I would connect the +3.3v to the top rail on the touch pad. ground is one wire and the two sense wires must be the remaining two. I think you have got a facelift loom.