I've noticed some radios have the pinouts printed on them, some don't. So here's the pinout if you want to bench test a radio.

1 LF- (AUDIO)
2 LF+ (AUDIO)
3 RF- (AUDIO)
4 RF+ (AUDIO)
5 GRD (COMMON GROUND)
6 PLT-
7 DIM (THE RED BACKLIGHTS)
8 ANT
9 IGN (+12v IN RUN)
10 BAT (+12v ALL TIMES)
11 L-AUX
12 AUD C
13 R-AUX
14 VOICE
16 VOICE C
17 RR- (AUDIO)
18 RR+ (AUDIO)
19 LR - (AUDIO)
20 LR + (AUDIO)

Now the next ones are for the plugs in the front of the amplifier/receiver unit visible upon dissassembly.

1 GP (THIS IS THE COMMON GROUND TO USE FOR AN AUX INPUT)
2 PLT
3 DIM
4 IGN
5 BAT
6 DAT
7 DAT
8 MUTE
9 L-AUD (THIS IS THE WIRE TO SPLICE INTO FOR AN AUX INPUT)
10 R-AUD (THIS IS THE OTHER WIRE TO SPLICE INTO FOR AN AUX INPUT)
11 AUD C
12 BAT
13 T-ON
14 DIM
15 HGRD
16 14V

_________________


1993 SSE Since 11-12-2000
2011 Camaro 2SS
2006 Silverado 3500 4x4