| Truck 1999 5.3L Connector C1 BLUE | |||
| Pin | Wire Color | Circuit No. | Function |
| 1 | BLK/WHT | 451 | PCM Ground |
| 2 | LT GRN | 1867 | Crankshaft Position Sensor B+ Supply |
| 3 | PNK/BLK | 1746 | Injector 3 Control |
| 4 | LT GRN/BLK | 1745 | Injector 2 Control |
| 5 | — | — | Not Used |
| 6 | — | — | Not Used |
| 7 | — | — | Not Used |
| 8 | — | — | Not Used |
| 9 | — | — | Not Used |
| 10 | — | — | Not Used |
| 11 | LT BLU | 1876 | Knock Sensor Signal Rear |
| 12 | DK BLU/WHT | 1869 | Crankshaft Position Sensor Signal |
| 13 | ORN/BLK | 463 | Requested Torque Signal (NW7) |
| 14 | ORN/BLK | 1061 | UART Serial Data (drive by wire only) |
| 15 | DK BLU/WHT | 774 | UART Serial Data (drive by wire only) |
| 16 | — | — | Not Used |
| 17 | DK BLU | 1225 | Transmission Fluid Pressure Switch B |
| 18 | RED | 1226 | Transmission Fluid Pressure Switch C |
| 19 | PNK | 439 | PCM Ignition Supply |
| 20 | ORN | 440 | PCM Battery Supply |
| 21 | YEL/BLK | 1868 | Crankshaft Position Sensor Ground |
| 22 | — | — | Not Used |
| 23 | PPL | 719 | Sensor Ground EGR |
| 24 | — | — | Not Used |
| 25 | TAN | 1671 | HO2S Signal Low B2S2 (w/Case Ground O2 Sensors) |
| 25 | TAN | 413 | HO2S Signal Low B2S2 (w/Isolated Ground O2 Sensors) |
| 26 | TAN | 1667 | HO2S Signal Low B2S1 (w/Case Ground O2 Sensors) |
| 26 | TAN | 413 | HO2S Signal Low B2S1 (w/Isolated Ground O2 Sensors) |
| 27 | — | — | Not Used |
| 28 | TAN/WHT | 1669 | HO2S Signal Low B1S2 (w/Case Ground O2 Sensors) |
| 28 | TAN | 413 | HO2S Signal Low B1S2 (w/Isolated Ground O2 Sensors) |
| 29 | TAN/WHT | 1653 | HO2S Signal Low B1S1 (w/Case Ground O2 Sensors) |
| 29 | TAN | 413 | HO2S Signal Low B1S1 (w/Isolated Ground O2 Sensors) |
| 30 | LT GRN | 1478 | Engine Coolant Level Switch |
| 31 | — | — | Not Used |
| 32 | BLK/WHT | 771 | PRND A Input |
| 33 | PPL | 420 | TCC Brake Switch |
| 34 | WHT | 776 | PRND P Input – PCM can be programmed to accept a SINGLE WIRE park/neutral signal on this PIN, if no trans mounted range sensor is present |
| 35 | GRA | 48 | Clutch Switch Signal (manual trans) |
| 36 | BLK | 1744 | Injector 1 Control |
| 37 | YEL/BLK | 846 | Injector 6 Control |
| 38 | PNK/WHT | 1101 | Damping Lift/Drive Signal |
| 39 | — | — | Not Used |
| 40 | BLK/WHT | 451 | PCM Ground |
| 41 | BLK | 407 | Sensor Ground (Trans) w/Case grounded o2 Sensors |
| 41 | GRY | 720 | Sensor Ground (Trans, ETC) w/Isolated Ground O2 Sensors |
| 42 | — | — | Not Used – ADD PIN HERE FOR FAN 1 RELAY CONTROL |
| 43 | RED/BLK | 877 | Injector 7 Control |
| 44 | LT BLU/BLK | 844 | Injector 4 Control |
| 45 | GRA | 474 | Fuel Tank Pressure Sensor 5V Reference |
| 46 | GRA | 416 | TP Sensor 5V Reference |
| 47 | GRA | 597 | MAP Sensor 5V Reference |
| 48 | GRA | 596 | EGR Pintle Position Sensor 5V Reference |
| 49-50 | — | — | Not Used |
| 51 | DK BLU | 496 | Knock Sensor Signal Front |
| 52 | — | — | Not Used |
| 53 | BLK | 470 | Fuel Tank Pressure Sensor Ground |
| 54 | BLK | 452 | TP Sensor Ground |
| 55 | BRN | 1456 | EGR Pintle Position Sensor Signal |
| 56 | — | — | Not Used |
| 57 | ORN | 440 | PCM Battery Supply |
| 58 | DK GRN | 1049 | Serial Data to OBD2 Port |
| 59 | YEL | 710 | Serial Data to BCM |
| 60 | ORN/BLK | 469 | MAP Sensor Ground |
| 61 | PNK/BLK | 632 | CMP Sensor Ground |
| 62 | — | — | Not Used |
| 63 | GRY | 720 | Sensor Ground (ETC) w/case grounded o2 sensors |
| 63 | TAN | 413 | Sensor Ground (HO2S Low Signal) w/isolated grounded o2 sensors |
| 64 | — | — | Not Used |
| 65 | PPL | 1670 | HO2S Signal High Bank 2 Sensor 2 |
| 66 | PPL | 1666 | HO2S Signal High Bank 2 Sensor 1 |
| 67 | — | — | Not Used |
| 68 | PPL/WHT | 1668 | HO2S Signal High Bank 1 Sensor 2 |
| 69 | PPL/WHT | 1665 | HO2S Signal High Bank 1 Sensor 1 |
| 70 | BRN | 1174 | Low Oil Level Switch |
| 71 | — | — | Not Used – ADD PIN HERE FOR TOW/HAUL MODE SWITCH INPUT (programming required to make function) |
| 72 | YEL | 772 | PRND B Input |
| 73 | BRN/WHT | 633 | Camshaft Position (CMP) Sensor Signal |
| 74 | YEL | 410 | Engine Coolant Temperature (ECT) Sensor Signal |
| 75 | PNK | 1020 | PCM Ignition Supply |
| 76 | BLK/WHT | 845 | Injector 5 Control |
| 77 | DK BLU/WHT | 878 | Injector 8 Control |
| 78 | — | — | Not Used |
| 79 | WHT | 687 | 3-2 Shift Solenoid Control |
| 80 | ORN/BLK | 510 | Fuel Level Sensor Ground |
| Truck 1999 5.3L Connector C2 RED | |||
| Pin | Wire Color | Circuit No. | Function |
| 1 | BLK/WHT | 451 | PCM Ground |
| 2 | BRN | 418 | TCC Control Solenoid |
| 3 | TAN | 1465 | Fuel Pump Relay Control – Secondary |
| 4 | — | — | Not Used |
| 5 | TAN/BLK | 464 | Deliverd Torque Signal |
| 6 | RED/BLK | 1228 | Transmission Fluid Pressure Control Solenoid High |
| 7 | RED | 1676 | EGR Solenoid Supply |
| 8 | LT BLU/WHT | 1229 | Transmission Fluid Pressure Control Solenoid Low |
| 9 | DK GRN/WHT | 465 | Fuel Pump Relay Control |
| 10 | WHT | 121 | Engine Speed (Tach) Output Signal |
| 11 | DK BLU | 604 | A/C High Pressure Recirculation Switch |
| 12 | — | — | Not Used |
| 13 | LT BLU/BLK | 396 | Cruise Control Engage Signal |
| 14 | — | — | Not Used |
| 15 | BRN | 25 | Generator L Terminal (Alternator turn on signal) |
| 16 | GRA/BLK | 1694 | 4 Wheel Drive Switch Signal Low (KEEP IF USING STOCK TRANSFER CASE IN A 4WD APPLACTION, WITH VSS ON OUTPUT OF TRANSFER CASE. |
| 17 | DK GRN/WHT | 762 | A/C Request Signal |
| 18 | — | — | Not Used |
| 19 | BLK/WHT | 1695 | 4 Wheel Drive Front Axle Switch |
| 20 | LT GRN/BLK | 822 | Vehicle Speed Sensor (VSS) Reference Low |
| 21 | PPL/WHT | 821 | Vehicle Speed Sensor (VSS) Signal |
| 22 | RED/BLK | 1230 | Vehicle Speed Sensor (VSS) Signal (4L80E Only) |
| 23 | DK BLU/WHT | 1231 | Vehicle Speed Sensor (VSS) Reference Low (4L80E Only) |
| 24 | DK BLU | 417 | TP Sensor Signal |
| 25 | TAN | 472 | IAT Sensor Signal |
| 26 | PPL | 2121 | Ignition Control 1 |
| 27 | RED | 2127 | Ignition Control 7 |
| 28 | LT BLU/WHT | 2126 | Ignition Control 6 |
| 29 | DK GRN/WHT | 2124 | Ignition Control 4 |
| 30 | — | — | Not Used |
| 31 | YEL | 492 | MAF Sensor Signal |
| 32 | LT GRN | 432 | MAP Sensor Signal |
| 33 | DK GRN | 1614 | HVAC Recirculation Door Control(KEEP PIN HERE FOR FAN 2 RELAY CONTROL) |
| 34 | DK GRN/WHT | 428 | EVAP Canister Purge Solenoid Control |
| 35 | — | — | Not Used |
| 36 | BRN | 436 | AIR Pump Relay Control (w/NC1) |
| 37 | — | — | Not Used |
| 38 | — | — | Not Used – ADD PIN FOR PWM FUEL GAUGE SIGNAL OUTPUT (used to run factory fuel level gauge in 96-99 trucks) |
| 39 | RED | 631 | CMP Sensor B+ Supply |
| 40 | BLK/WHT | 451 | PCM Ground |
| 41 | WHT | 257 | EGR Solenoid Ground |
| 42 | TAN/BLK | 422 | TCC Enable Circuit (4L60-E only) |
| 43 | DK GRN/WHT | 459 | A/C Clutch Relay Control |
| 44 | — | — | Not Used |
| 45 | WHT | 1310 | EVAP Canister Vent Valve Control |
| 46 | BRN/WHT | 419 | Malfunction Indicator Lamp (MIL) Control |
| 47 | YEL/BLK | 1223 | Transmission Shift Solenoid B |
| 48 | LT GRN | 1222 | Transmission Shift Solenoid A |
| 49 | YEL/BLK | 1827 | Vehicle Speed Output Circuit 128K |
| 50 | DK GRN/WHT | 817 | Vehicle Speed Output Circuit 4K |
| 51 | YEL/BLK | 1227 | Transmission Temperature Sensor Signal |
| 52 | GRY | 23 | Generator Field Duty Cycle Signal |
| 53 | — | — | Not Used |
| 54 | PPL | 1589 | Fuel Level Sensor Signal |
| 55 | DK GRN | 603 | A/C Low Pressure Switch Signal |
| 56 | — | — | Not Used |
| 57 | BLK | 552 | IAT Sensor Ground |
| 58 | — | — | Not Used |
| 59 | — | — | Not Used |
| 60 | BRN | 2129 | Ignition Control Reference Low Bank 1 |
| 61 | BRN/WHT | 2130 | Ignition Control Reference Low Bank 2 |
| 62 | GRA | 773 | PRND C |
| 63 | PNK | 1224 | Transmission Fluid Pressure Switch A |
| 64 | DK GRN | 890 | Fuel Tank Pressure Sensor Signal |
| 65 | — | — | Not Used |
| 66 | PPL/WHT | 2128 | Ignition Control 8 |
| 67 | RED/WHT | 2122 | Ignition Control 2 |
| 68 | DK GRN | 2125 | Ignition Control 5 |
| 69 | LT BLU | 2123 | Ignition Control 3 |
| 70 | — | — | Not Used |
| 71 | — | — | Not Used – |
| 72 | — | — | Not Used |
| 73 | DK BLU | 1936 | Fuel Level Sensor Signal – Secondary |
| 74 | LT GRN/WHT | 3213 | HO2S Heater Control (w/isolated grounded sensors) (2001-02 6.0L Only) |
| 75 | — | — | Not Used |
| 76 | LT GRN/WHT | 1749 | IAC Coil B High |
| 77 | LT GRN/BLK | 444 | IAC Coil B Low |
| 78 | LT BLU/BLK | 1748 | IAC Coil A Low |
| 79 | LT BLU/WHT | 1747 | IAC Coil A High |
| 80 | LT GRN | 3212 | HO2S Heater Low Reference (w/isolated grounded sensors (2001-02 6.0L Only) |
