If it's the factory radio this is probably the an HONDA, or NISSAN.... and most of them will cut the power on the electric antenna wire when switching to CD, tape deck.
Well there's another way... just use the accessory wire at the ignition switch, then do a delay... or not. Many time i did it in the past.
As far as i remind, DEI do something like the unit you want to do.
Usually, 6V is present between each speaker lead and ground(drive BTL by TDA73XXXX amp or equiv). Easy way, use capacitor to remove the DC, pass it thru an OP-AMP/Voltage comparator/ADC and then activate/disable you Amplifier remote lead.
Many car have also external amplifier, if you give me the car model/year i can see if there's any possibility of external amplifier.
EDIT: Is the unit the original or aftermarket?? If it's an aftermarket, as previoulsy mention... many chances are that the Power Antenna wire will also send DC while the CD is running... case not you must have 2 of thes blue wire back to this unit...
Last edited by mister_e; - 8th July 2005 at 03:38.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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