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The radio has a permanent power wire to keep it's station memory. You are losing power on this for some reason. Possibly starter motor is shorting the battery. Possibly one of the big earth straps is corroded.
If your asking about the radio channels and radio clock, there is a wire that is always hot that has to be connected to the radio's always alive wire. If it is not hooked to the wire that is always hot, (like hooked to an ignition wire) then it will not be hot and every time the ignition is turned off, you will lose the clock time and channels memory. If you have a test light, check the wires at the radio (with the key off) and see which one is hot. If none are hot, then you have a blown fuse or wire broken.
Radio should have 2 power leads, one should be switched, (hooked to key switch) and one should be hooked direct to battery so you don't lose memory when you shut the car off. Someone hooked them both to the key switch.
The radio receives power from the 15A AUDIO FUSE in the dash fuse box. The radio memory receives power from the 10A DOME LIGHT FUSE in the same box. The problems you note suggest the radio may have been misconnected at some point or there has been a fuse failure or there is a broken connection.
should be to replace battery with having cranking issues.just make sure ignition switch off keys out ignition. and turn radio off before disconnecting negative battery cable you may or may not lose radio code.if so dealership has to reprogram radio. your ECM may lose memory but it will reset after one drive cycle to restore driveability.
loss of power to the memory on radio there are two power wires besure the memory wire goes to a point that has power all the time if they both go to the key sw (on/off) when you lose power you lose memory.
TURN OFF RADIO FIRST BEFORE DISCONNECTING THE NEGATIVE BATTERY CABLE BUT.THATS NO GUARANTEE YOU WILL LOSE RADIO CODE I WOULD TRY TO USE A BACK UP MEMORY SAVER YOU PLUG IN THE CIGARETTE LIGHTER BUT NO GOOD IF CAR GOING TO BE DOWN LONG.TIME BECAUSE THE MEMORY SAVER BATTERY WILL GET WEAK YOURE IN TROUBLE.BMW WARNS IF YOU DISCONNECT BATTERY CABLES YOU WOULD LOSE HEATING COOLING CLIMATE CONTROL.YOU ALSO WILL LOSE FUNCTION TO WINDSHIELD WIPERS AND WASHER , CENTRAL LOCKING AND THEFT SYSTEM CONTROL.