Pinouts

301VU CAPT LIGHTING/LOUDSPEAKER CTL PNL
OUTPUTS
Captain GPWS / G/S Upper 2101VC – A/C
Captain GPWS / G/S Lower 2101VC – A/D
Backlight 2101VC – <G(5VDC)/<H
Console/Floor Lt 2101VC – <D (28VDC)/R or S (GND), <E /<F (Lt Briefcase and Console, parallel circuit)
Seat Lt 2101VC – H(+28VDC supply)

INPUTS
Captain GPWS/G/S Push Button – 2101VC – B/E
ND, CAPT POT 2101VC – U,N(wiper),M ; U,V(wiper),M
PFD, CAPT POT 2101VC – K,L(wiper),J

Captain PFD/ND XFR 2101VC – Z (+28VDC – relay box); connect to input joystick board <a (discrete output or ground to R or S)

Captain Loud Speaker 2103VC – Hi/Lo input D/C (connect to audio source) | Hi/Lo output A/B (connect to 7WW LoudSpeaker);

500VU F/O LIGHTING/LOUDSPEAKER CTL PNL
OUTPUTS
FO GPWS / G/S Upper 2104VC – C/D
FO GPWS / G/S Lower 2104VC – A/E
FO PFD/ND Backlight 2104VC <G (5VDC)/<H
Console/Floor Lt 2104VC – <F(28VDC)/T or U, <D/<E Lt Briefcase and Console, parallel circuit),
Seat Lt 2104VC – J(+28VDC supply)

INPUTS
FO GPWS/G/S Push Button 2104VC – B/F
ND, FO POT 2104VC – N,M(wiper),L ; N,P(wiper),L
PFD, FO POT 2104VC – W,X(wiper),R

FO PFD/ND XFR 2104VC – <T (+28VDC – relay box); connect to input joystick board K (discrete output or ground to T or U)

FO Loud Speaker 2108VC – Hi/Lo input D/C (connect to audio source) | Hi/Lo output A/B (connect to 8WW Loudspeaker)

References

AWM 23-51-07, 34-48-01, 31-68-01, 31-68-02, 31-68-04, 31-68-08, 33-12-01

Thank you Thomas, Simon and David for pinout confirmation