Shown below are the pins wires coming out of the factory STEREO HEAD UNIT

2005 Chevy Blazer Stereo Head Unit Connections

Top pin Coaxal cable for radio antenna
Pin A1 Serial Data
Pin A3 no connection
Pin A4 no connection
Pin A5 no connection
Pin A6 Dark Green Wire Rap Support Volt
Pin A7 Dark Blue wire Request Signal input
Pin A8 Tan wire LF SPKOUT (+)
Pin A9 Grey Wire LF SPKOUT (-)
Pin A10 Light Blue Wire RR SPKOUT (-)
Pin A11 Dark Blue Wire RR SPKOUT (+)
Pin A12 Black Wire GROUND
Pin B1 Orange Wire Battery Voltage
Pin B2 Dark Green Wire Rap Fuse Supply Voltage
Pin B3 no connection
Pin B4 Grey Wire Lamp Sup Voltage
Pin B5 Black Wire GROUND
Pin B6 no coonection
Pin B7 no connection
Pin B8 Brown Wire LR SPKROUT (+)
Pin B9 Yellow Wire LF SPKROUT (-)
Pin B10 Dark Green Wire RF SKPROUT (-)
Pin B11 Light Green Wire RF SPKROUT (+)
Pin B12 Purple White Wire LED Diming Signal

If you need a detailed stereo wiring diagram, please contact ATS

Legend

LF left front
LR left right
SPK Speaker
GROUND ground supply connection
(+) positive wire connection
(-) negative wire connection

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