Grande Punto 2005, steering wheel controls testable?

[newlife81]

Hello

I´ve got a Question:
Is it possible to test the controls on the steering wheel with FES/MES?
My Radio doesn´t react if I push the "mute" oder "louder" button and now I would like to find the fault.

Could anyone help me please?




EDIT: I´m sorry for posting in wrong section

[Aron96]

Hello newlife81,
Multiecuscan with this test not done yet, but I suggest you first try the error diagnosed with disconnect the negative battery terminal for about 2mins then try but always in the context of ignition

[tzok]

Do you have the original car audio? Does hour horn work? Don't you have SRS/AirBag fault indicator lit?

[newlife81]

Hi und thanks for your help.

I put in an original car audio, bevor there where build in an other radio.
My horn works fine and I don´t have any fault indicator lit.

May ist be the wrong original Radio?

[yani]

My Radio doesn´t react if I push the "mute" oder "louder" button and now I would like to find the fault.

Doe it mean that only these 2 buttons do not work and the other buttons work fine?

[newlife81]

yes! that´s right

[yani]

That is strange. See the wiring diagram of Grande Punto steering wheel control.
The Mute, Vol+ and Vol- buttons are on the same wires. So, if one of the wires is interrupted then the 3 buttons should not work.
It is possible that these 2 buttons buttons are damaged.

gp_sw_controls.jpg (32.61 KiB) Viewed 8526 times

[newlife81]

i´ve heard about this fact and the functionality with the resistors.
it may be the controls (about 65€ at the Dealer), but I can´t eliminate possibility that the fault is caused of the (wrong / broken) head unit.

[s130]

Deciding if the buttons or the head unit are are fault should not be that difficult to do.

If a good quality volt meter is connected between terminals 35 & 50 and 35 & 52 then when each of the buttons is pressed you should see different voltages. With no button pressed then the voltage will be high (by high I mean non zero). When the Mute button is pressed the voltage should drop a little. When the Vol+ is pressed is should drop a little further. When the Vol- is pressed the voltage should drop the most.

Alternatively you can unplug the key unit (DO47) cable and do resistive measurements instead.

Assuming the resistors used are of similar/same value on the Volume and Source/Scan banks then you should be able to also detect internal breaks, shorts or permanently stuck buttons.

[alexandru c]

Do you have the original car audio? Does hour horn work? Don't you have SRS/AirBag fault indicator lit?

Hi to all,
I have a similar problem and i have the airbag fault indicator, also i want to say that my buttons works but not as they should work, sometime dont work at all and sometimes they work but for example, when i press the -volume button the volume rise and when i press the +volume button the music is putted on pause or mute, and also sometimes they work well, i suppose it have different actions depending from steering wheel position. The airbag fault indicator is not always on is turning on and off when i drive the car. Thank you very much and i`m sorry if i have a bad english. Have a nice day.