Phoenix Gold XS4600 blown trace

If the voltage on pin 15 isn't switching off, you need to find the two transistors that correspond to the ones in the diagram. The reason it wasn't switching couldn't have been the square washer because you measured the voltage and it was 0v.

To prevent this from happening in the vehicle, replace the screw and plate washer with a regular 4mm screw and use a ring or spade terminal for remote.
 
I am checking using the diode (beep) function of my meter. When B+ is connected every transistor collector I check is connected to pin 15, same with every transistor emmiter connected with B+. However with B+ disconnected none of the transistors are connected with pin 15.
 
You can't have voltage applied to the circuit when using diode-check or ohms. The meter relies on the voltage it applies to the circuit to give the readings.

The transistor may not be directly connected. A series resistor could be preventing you from seeing the connection with a meter. Follow the traces back away from pin 15, using the meter to find traces that pass under the IC or other components.
 
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I rechecked the voltages on the 3525 and now they are nearly all 0.


DC voltage?
Pin 1: 0
Pin 2: 0
Pin 3: 0
Pin 4: 0
Pin 5: .001
Pin 6: 0
Pin 7: .002
Pin 8: 0
Pin 9: 0
Pin 10: 0
Pin 11: .001
Pin 12: 0
Pin 13: 12.65
Pin 14: 0
Pin 15: .535 fluctuating
Pin 16: .001