Has anyone work out how the premium radio is wired so it can be used without the factory amplifier? My amp has a dead channel so I'm trying to replace it with a modern lighter and more powerful amp with bluetooth music connectivity.
I've pulled the amp apart and stripped back the round black DIN plug at the amp end.
The black din cable is shielded and has a grey cable inside it. I've spent the morning on this and am not confident I've got the wiring and voltages required right.
The 'easy' bit:
That grey cable is your low power audio channels and it has shielded tiny red, white, green and blue wires. I can solder those wires and shielding to RCA plugs so they plug into my amp RCA's.
The 'hard bit:
The head unit needs power from the amp in order for the head unit to turn on. The amplifier also needs power from the head unit for it to turn it on. I'm not sure if these triggers are supposed to be 12v or a reduced voltage (this question will become clearer later).
By pulling the amp apart I worked out that the pink and orange wires are joined into one circuit on the circuit board when they enter the amp. The amp sends power to both these wires. If I feed 12v to one or both of these wires with the head unit earth wire attached to the battery then the head unit equaliser and tape deck (not tuner) power up.
When the head unit is powered up with 12v it then feeds 12v back down the yellow wire. If I put 12v to the yellow wire to the disconnected amp which has power and ground to its own power cable then both relays in that amp click closed so I assume it powers up. At this point if I test the voltage at the orange and pink wire outputs from the amp back toward the head unit they measure just 1.76v. I don't know if this is because my amp is damaged or if it is supposed to only send low voltage up the pink and orange wires to trigger the head unit.
The display for the tuner on the head unit never lights up. The tuner will click when you connect the yellow or red power wires to power but it still won't light up.
So.... has anyone had success using the premium head unit with a different amp?
