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36 (20+8+8) pin Head Unit / Car Stereo ISO connector layout
36 (20+8+8) pin Head Unit / Car Stereo ISO connector
at the car stereo

 

Connector A

Pin
Number
wire color Function
2 PU Drain Wire
3 L-GN Right Front Low Level Audio Signal (+)
4 L-GN Right Front Low Level Audio Signal (-)
5 TN Left Front Low Level Audio Signal (+)
6 D-GN Left Front Low Level Audio Signal (-)
8 BARE Drain Wire

Connector B

Pin
Number
wire color Function
1 BN/WH Right Audio Signal (+)
2 PU Remote Radio Control Supply Voltage
3 D-GN/WH Left Audio Signal (+)
4 TN/WH Audio Common
6 BARE Drain
7 RD/WH Battery Positive Voltage
8 BK/WH Ground

 

Connector C

Pin
Number
wire color Function
8 PU Class 2 Serial Data
11 PU Class 2 Serial Data
13 D-BU Steering Wheel Controls Signal
19 OG FM Composite Signal

 

Not tested! Pins not mentioned are not connected.

 

p/n 25768020, 10387600, 15144093, 15280956, 15824245, 15887291, 15950587, 25741528, 2570438, 25753339, 25768020, 25770920 

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Cadillac CTS (2003-2007), SRX (2004-2006) U2R/U2S Head Unit visual pinout:click to enlarge
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