Data link connector circuit for GMC Pickup C3500 (1985-2000)

BLK/WHT WIRE BRAKE PRESSURE MODULATOR VALVE (NEAR BRAKE MASTER CLYINDER) DATA LINK CONNECTOR DIAGNOSTIC ENERGY RESERVE MODULE (BEHIND CENTER OF I/P) DIAGNOSTIC TEST DK BRN WIRE FUEL PUMP RELAY ORG/ WIRE POWERTRAIN CONTROL MODULE (UNDER RIGHT END OF I/P) RADIO RED WIRE REMOTE KEYLESS ENTRY MODULE (BEHIND CENTER OF I/P) SERIAL DATA TAN WIRE TAN/WHT WIRE WHT/BLK WIRE