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 MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 40 (SEAT HEATING SYSTEM & SEAT COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2345 (FRONT SEAT)CIRCUIT/SYSTEM TESTINGNOTES
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing: Notes
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Notes
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B2345 00
- Ignition OFF, disconnect the MSM connectors C1 and C4.
- Test for infinite resistance between the left seat heating element supply voltage circuit terminal 14 and ground.
- If less than infinite, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to ground.
- Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 14 and ground.
- If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to voltage.
- Test for infinite resistance between the right seat heating element supply voltage circuit terminal 6 and ground.
- If less than infinite, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to ground.
- Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 6 and ground.
- If the test lamp illuminates, test the supply voltage circuit and the seat cushion and seat back heating element control circuits for a short to voltage.
- If all circuits test normal, replace the MSM.
B2345 13
- Disconnect the MSM connectors C2 and C5.
- Verify the resistance through the faulted seat heat sensor is 850-300K ohms from the signal circuit terminal to the low reference circuit terminal in the harness connectors.
- If less than 850 ohms, replace the seat heater element.
- If the circuits test normal replace the MSM.
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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.