App radio wont shut off draining battery - Pioneer DEH-1430R CD Player

The RAP relay RAP Relay

Ignition switch may be worn out or the safety switch on the transmission linkage when it is put in park may be bad ,

Check if it has a relay. The contact in it could be shorted. Replace the relay.

The battery itself may have an issue? You could try disconnecting the cable when you park and see if something is truly draining the battery. If it is you may notice a slight spark when you disconnect the cable. The alt may have a bad diode so it will charge the battery but drain it once the motor is shut off? Or it could be something like you suggested. The radio remembers its settings by being connected all the time. However a stock radio does not take much from the battery.

In order for the alternater to charge there has to be some current in the battery; it may needan external charge boost to do the testing. Since replacements have already been made there must be an internal current drain on the battery Since the radio will not shut off this would be the most likely component to start checking. Suggest you locate and remove the appropriate fuse and see if the battery discharges after it has beencharged -up If this solves the problem then obviously the radio needs to be replaced. A test light inserted between the negative post of the battery and the negative battery cable will indicate battery drain but some is normal due to to computer keep-a- live and security systems.

It sounds like your alternator went bad. The alternator is responsible for keeping your battery charged and at full power. If it goes bad, your battery eventually drains and things start to shut down.
Get your alternator and battery tested, I'm sure you'll find the alternator has died.

sounds like a 12V drain on the system, like a trunk or glove box light that won't shut off.> Could be many. many other reasons why. The way I would find the draining circuit would be to remove the neg cable of the battery. I then would connect a 12V test light between the neg battery TERMINAL and the neg battery CABLE. With a 12V drain the light will shine. I would install into the light a 9V battery powered recepticle to hold computer and radio station memory. Then I remove fuses 1 at a time, then reinstall, at the same time looking for the 12V light to go out. Hope this helps.

test the alternator it could be draining your battery.

All newer vehicles have a safety battery shut off. Youll need to turn your key back to accessory. say your listening to your radio with the keys out, it will shut off after 10 mins so it dont drain your battery. dont worry about it killing your battery charging a phone...ect.

your radio is staying on? you have a bad door switch.the bcm does not see door opening and thus does not turn radio off. most likely the drivers door.