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.
Schematic and Routing Diagrams
For Chevy Express, see:
- G1500: BODY CONTROL MODULES
- G2500: BODY CONTROL MODULES
- G3500: BODY CONTROL MODULES
- H1500: BODY CONTROL MODULES
- H2500: BODY CONTROL MODULES
For Cutaway 3500, see BODY CONTROL MODULES .
For RV Cutaway 3500, see BODY CONTROL MODULES .
For GMC Savana, see:
- G1500: BODY CONTROL MODULES
- G2500: BODY CONTROL MODULES
- G3500: BODY CONTROL MODULES
- H1500: BODY CONTROL MODULES
- H2500: BODY CONTROL MODULES
For Savana Camper Special 3500, see BODY CONTROL MODULES .
For Savana Special 3500, see BODY CONTROL MODULES .
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.