posted on Oct, 14 2013 @ 07:27 PM
reply to post by Lil Drummerboy
I suppose that it could be a software problem, see here (unless you posted this to that forum):
Ford Radio issue
But, I will tell you this, it could be more of an issue with the control buttons, especially if they are on the steering wheel. I used to work for a
manufacturer who was an OEM supplier to the automotive industry of electrical and electronic components. I worked in the test lab and wrote software
to run the test fixtures to QC verify both design iterations and final product.
Beginning back in the late 90's manufacturers wanted to reduce wiring and componentry and use as few I/O (interface) ports on their controllers
(think CPU) as possible. In order to accomplish this task, the switches are all wired in a sort of parallel mode with different resistive values in
series with each switch circuit.
This switched resistive ladder network employs only 1 ground and 1 signal wire back to the processing unit and the resultant voltage division from the
switch network is calculated by a 12, 14 or 16 bit ADC (Analog-to-Digital Converter) with the digital value then having a match in the firmware's
command value lookup table for whatever it is controlling.
This system works well and is usually immune to noisy switches (bounce) when proper decoupling capacitors are used on the input circuitry.
The value scale is usually chosen so that pressing multiple buttons at the same time will not trigger a false or ambiguous button press. Usually it is
It is possible that one of the switches had some strange situation where the button may have been depressed or stuck for a little while. This can
happen if there is plastic flashing or a burr of some sort on either the button base or along the edge of the escutcheon (Panel Face) that the buttons
Next time it happens, try pressing every button with the power off and feel for any that don't have a positive "click" or tactile feel to it. This
can also happen if the buttons are exposed to direct sunlight and they become slightly "sticky". We used to test them in environmental chambers per
Ford specifications with 85 degrees Celsius and 80% or 85% humidity for 96 hours for one specific test.
I would bet on direct sunlight but it wouldn't hurt to check with your dealer for Trouble Bulletins and a possible warranty fix.
Good Luck with it.