Tristated output to two common Base transistor issue

[BrianT]

With no PIC or any other drive, the PNP and NPN transistors are both turned ON by each other and the two series resistors (not shown) which are inside the cases. If you used regular PNP and NPN without intrinsic series resistors the circuit would instantly blow up two transistors.

IF the LED supply is the 12 volt auto battery things get worse. The PNP is always conducting because its base is at either 0 or 5 volts while the emitter is at 12 volts. The PNP base sees either 7 or 12 volts drive so it is always ON.

A rethink is needed.

HTH
Brian