Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Chevrolet S10 PickupFACTORY OEM SERVICE PROCEDURE
Transfer Case Shift Control Module Connector End View
Transfer Case Shift Control Module
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| C1 | GRY/BLK | 1694 | 4WD Low Signal |
| C2 | - | - | Not Used |
| C3 | DK GRN/ WHT |
1559 | 4 LO Switch Signal |
| C4 | DK GRN/ WHT |
1562 | 2 HI Switch Signal |
| C5 | GRY/BLK | 1564 | 4 HI Switch Signal |
| C6 | ORN | 40 | Battery Positive Voltage |
| C7 | - | - | Not Used |
| C8 | BRN | 241 | Ignition 3 Voltage |
| C9 | BLK/WHT | 1554 | Encoder Signal Ground |
| C10 | BLK | 1050 | Ground |
| C11 | LT GRN/BLK | 1563 | 2 HI Indicator Control |
| C12 | TAN/BLK | 1566 | 4 HI Indicator Control |
| C13 | - | - | Not Used |
| C14 | PPL/WHT | 1565 | 4 LO Indicator Control |
| C15 | - | - | Not Used |
| C16 | BLK | 1552 | Motor A Control |
| D1 | RED | 1553 | Motor B Control |
| D2 | LT GRN/BLK | 584 | A/T Shift Lock Control Switch Supply Voltage |
| D3 | ORN | 1568 | Diagnostic Enable |
| D4 | BRN/WHT | 1555 | Channel P Encoder Signal |
| D5 | RED/WHT | 1556 | Channel C Encoder Signal |
| D6 | DK BLU/ WHT |
1557 | Channel A Encoder Signal |
| D7 | YEL/BLK | 1558 | Channel B Encoder Signal |
| D8 | DK GRN/ WHT |
817 | Vehicle Speed Signal |
| D9-D11 | - | - | Not Used |
| D12 | BLK | 1050 | Ground |
| D13 | BLK | 1050 | Ground |
| D14 | ORN | 1640 | Battery Positive Voltage |
| D15 | ORN | 1640 | Battery Positive Voltage |
| D16 | PPL | 806 | Crank Voltage |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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