OEM Radio swap out with upgraded OEM

[FLBill]

Hey

Have a '92 Chevy 1500. It had the OEM radio with the tape player and pocket and I swapped out that with the tape deck with the Equalizer . Also swapped out the Control Head, with one that goes with the Equalizer. tape deck. Also swapped out the CDM which is designed for it all.

Turned on....everything works , but there is no Equalizer function. There are just little blue/green lit dashes; no five adjustment functions ; no ability to control that.. The Equalizer has the rocker buttons but pushing them does nothing What am I missing?

On the bench, when the parts are connected, everything including the five function rocker button Equalizer worked fine . Do not understand why it does not work in the Chevy truck.

I did notice when removing the original Control Head that there is a white wire integral to the plug from it, which plugs into the CDM. This white wire comes out of that plug which plugs into the CDM and is like a separate wire and it plugs into a single dark green wire under the dash. I do not know what it does. It is now not being used, as there is no such provision on the Equalizer Control Head plug.

Any ideas??

Bill