I have a PIC-based project installed in my car and it has the ICSP wires 
routed out of it and wired to a DB-9 connector.  But now, some months later, 
I can't find the DB-9 pinout.  Would it be possible (using a multimeter) to 
identify which wires correspond to which ICSP pins, without tearing back into 
the car?

Some specifics on the application circuit:
- PIC16F913
- MCLR is not connected to anything (using internal MCLR).
- Vdd is at 5volts.
- RB7/PGD is not connected to anything.
- RB6/PGC is connected to one side of a tact switch and the other side goes to 
ground.  Yes, I have access to the tact switch.
- Vss is connected to a ground wire coming out of the gauge.

With this, I figure I should be able to determine Vss, Vdd and PGC relatively 
easily.  From the code, RB7/PGD is currently setup as an input, and MCLR 
defaults to an input.  I'm thinking I can connect a 0V-5V signal to any input 
pin though a resistor and being an input, the voltage at the pin should 
follow the external signal.  But with both MCLR and PGD being inputs, would 
it be possible to differentiate between these two?

Cheers,
-Neil.

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