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.
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HOMESERVICE MANUALSCHEVROLET2012CHEVY EXPRESS G2500, VAN PASSENGER, 4.8L ENG VIN AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2335 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - Q1B TO X88)COMPONENT CONNECTOR END VIEWSS74 TOW/HAUL MODE SWITCH
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN A
S74 Tow/Haul Mode Switch
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN ASECTION S74 Tow/Haul Mode Switch
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 GMC Savana, 2013 GMC RV Cutaway, 2013 GMC Cutaway, 2013 Chevrolet RV Cutaway, and 2013 Chevrolet Express. However, it is still accessible from the selected car via links, so may be relevant.
Connector Part Information
|
Terminal Part Information
| Terminal Type ID | Terminated Lead | Diagnostic Test Probe | Terminal Removal Tool | Service Terminal | Tray | Core Crimp | Insulation Crimp |
|---|---|---|---|---|---|---|---|
| I | 13575464 | J-35616-14 (GN) | J-38125-12A | 15326030 | 5 | E | C |
S74 Tow/Haul Mode Switch
| Pin | Size | Color | Circuit | Function | Terminal Type ID | Option |
|---|---|---|---|---|---|---|
| A | 0.5 | BK/WH | 351 | Ground | I | - |
| B | 0.35 | BN/WH | 230 | Instrument Panel Lamps Dimming Control | I | - |
| C | - | - | - | Not Occupied | - | - |
| D | 0.35 | L-BU | 1788 | Tow/Haul Switch Signal | I | - |
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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.