Radio Connector, Terminal Identification

Connector I, 10-pin, red
1 - Data 1)
2 - Clock 1)
3 - Enable 1)
4 - Open
5 - Ground (GND)
6 - Open
7 - Open
8 - Right-rear speaker
9 - Open
10 - Left-rear speaker
1) Not applicable to USA/Canada

Connector II, 8-pin, brown
1 - Open
2 - Open
3 - Right-front speaker (+) 2)
4 - Right-front speaker (-) 2)
5 - Left-front speaker (+) 2)
6 - Left-front speaker (-) 2)
7 - Open
8 - Open
2) Passive speaker

Connector III, 8-pin, black
1 - Vehicle speed signal
2 - Open
3 - Open
4 - Terminal 86s (ignition/starter switch) 3)
5 - Switched battery positive (B+) for power mast antenna
6 - Radio illumination (terminal 58d)
7 - Battery positive (B+), terminal 30
8 - Battery negative (-), terminal 31
3) For coding (security code) and for flashing LED

Radio LED flashes when:
1 - Radio has been coded (code input)
2 - Radio switched off
3 - Ignition key removed (terminal 86s active)