Radios

All pin-outs are looking at the face of the connector.

Main Connector (Black):

(clip)
Brown/Blue (Alarm) or Blue/White (Vol. Adj.) Alarm or Speed-Volume Adjustment 1 2 Telephone Mute Yellow
White/Blue or Blue/White (AKTIV power signal) AKTIV or K-wire 3 4 Switched Power Brown/Red
White (Power Ant.) or Black (Amplified Ant.) Power Antenna or SAFE 5 6 Illumination Gray/Blue
Red/White Constant Power 7 8 Ground Brown

Speaker Connector (Brown):

(clip)
RR+ 1 2 RR-
RF+ 3 4 RF-
LF+ 5 6 LF-
LR+ 7 8 LR-

AKTIV Connector (Red):

(clip)
Data 1 2 Clock
ENA 3 4 -
Speaker Common Ground 5 6 RC
Right Front Line Out + 7 8 Right Rear Line-Out +
Left Front Line Out + 9 10 Left Rear Line-Out +

CD Changer Connector (Pink):

(clip)
Black Data In 1 2 Clock Red
Green or Black Shield, CD-In Ground 3 4 Data Out White
? Line-Out Ground 5 6 Constant Power Yellow
Red Right CD-In 7 8 Right Line-Out ?
? Left Line-Out 9 10 Left CD-In White

Accessory connectors (1998+):

Amplifier (yellow):
Left Rear Line-Out 1 2 Right Rear Line-Out
Ground 3
Left Rear Line-Out 4 5 Right Rear Line-Out
Amplifier Power 6
External control/display (green):
Open 7 8 Clock
Data 9
ENA 10 11 Remote Control (steering wheel) Yellow/Red
Open 12
CD Changer (blue):
Blue Data In 13 14 Data Out Green
Yellow Clock 15
Red Constant Power 16 17 Switched Power Green
Black Ground 18
Violet CD-In, Left 19 20 CD-In, Right White

Speaker Connector Colors:

Left Front + Left Front - Right Front + Right Front - Left Rear + Left Rear - Right Rear + Right Rear -
1985-1987 Golf, GTI White/Black Brown/White Green/Black Brown White/Black Brown/White Green/Black Brown
1988-1989 Golf, GTI White/Green Brown/Green Green/White Brown/Blue White/Black Brown/White Green/Black Brown
1985-1986 Jetta Brown/Green Brown Brown/Red Brown Blue Brown Red Brown
1986-1989 Jetta, All models 90-99 Blue Brown/Blue Red Brown/White Blue/Green Brown/Red Red/Green Brown/Black

AKTIV Connector Colors:

AKTIV Left Front + AKTIV Right Front + AKTIV Left Rear + AKTIV Right Rear + AKTIV Common ground for door speakers -
1988-1989 Golf, GTI Green/Black White/Black - - Brown/Yellow
1988-1989 Jetta Blue/Black Red/Yelllow - - Red/Black
1989 Jetta, All models 90-99 Blue/Brown Blue/Red Green Blue Red/Black