I have a 06 FEH with a 6 CD/SAT radio (NO NAV), My radio has a speed volume menu for 0-7 volume settings. It did not work so I took it in to have it fixed. The SA said I had a bad radio and ordered a new one. It took 4 weeks but it finally came in. (4 weeks is another story). After a couple of hours with the car the SA came to me and said it still was not working and would need to keep the car for testing and asked if I would leave it over night.

The next day he told me my FEH did NOT have this feature even though the radio acted like it should have it. The tech ran an OASIS and found OASIS # 19400 for 2005-2007 FEH and MMH. He gave me a copy of it and it says it needed a circuit to make it work. It said n part "...also a speed signal input circuit (679 GY-BK) present at pin 14 of c240a of the audio unit. If this circuit is not present in c240a the radio is operating as designed and no repairs are necessary." He also gave me a HVBoM for my vin. It has the features and codes built into my car. Under audio it has a code IGHAA which says "Less radio control auto volume".

Bottom line here is I'm told the car does't have the wiring (senor?) to make the speed volume work.

Just my experience with speed volume.

"He who laughs last is a slow thinker."