GMC Rally G2500 (1985-1995) 5.0l (vin h), data link connector circuit

BLK WIRE BLK/WHT WIRE DATA LINK CONNECTOR DIAGNOSTIC ENERGY RERSERVE MODULE (BEHIND LEFT SIDE OF I/P, NEAR FUSE BLOCK) DIAGNOSTIC REQUEST DIAGNOSTIC TEST FOUR-WHEEL ANTI- LOCK BRAKE MODULE (UNDER RIGHT SIDE OF VEHICLE, AT FRAME RAIL) KEYLESS ENTRY MODULE (BEHIND RIGHT SIDE OF I/P) TRANS- MITTER INITIAL- IZATION LT GRN WIRE ORG/ WIRE ORG/BLK WIRE POWERTRAIN CONTROL MODULE (MOUNTED UNDER DRIVER'S SEAT) SERIAL DATA TAN/WHT WIRE WHT WIRE WHT/BLK WIRE