DLS, DUS, DLA, and DUA are all at 0 volts when off and car battery voltage when pulsed.
DLS is door lock switch, DUS or door unlock switch, DLA is door lock actuator, and DUA is door unlock actuator.
There is not really much current being switched, all I need them for is to tell when they are on and off so that the circuit can pulse (take to ground) the correct button on a keyfob at the way right side of the circuit. Instead of the battery at the right, I put a 3.3V voltage regulator in place.
Whenever DLS or DUS are pulsed, DLA and DUA WILL be pulsed but DLA and DUA can be pulsed without DLS and DUS being pulsed.
When DLS and DUS are held to ground and either DLA or DUA are pulsed, the correct button on the fob at the right is pulsed, so the two 555s on the right are working correctly.