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 MANUALSGMC2013SAVANA H1500, VAN CARGOREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTIGNITION SWITCH/STEERING LOCKWIRING SYSTEMS AND POWER MANAGEMENT - DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC INFORMATION AND PROCEDURESDTC B1433CIRCUIT/SYSTEM TESTING
2013 GMC Savana H1500, Van Cargo
Circuit/System Testing
2013 GMC Savana H1500, Van CargoSECTION Circuit/System Testing
- With the ignition OFF, disconnect the RUN relay.
- Connect a test lamp between the relay coil control circuit terminal and ground.
- Cycle the ignition ON and OFF. The test lamp should turn ON and OFF when changing ignition switch positions.
- If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
- If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
- If the test lamp illuminates normal, test or replace the Run relay.
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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.