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 CARGO EXTENDED, 4.8 CREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMSDIAGNOSTIC INFORMATION AND PROCEDURESCRUISE CONTROL INDICATOR MALFUNCTION (SWITCH INDICATOR MALFUNCTION)CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Cargo Extended, 4.8 C
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Cargo Extended, 4.8 CSECTION Circuit/System Testing
CAUTION:
Refer to SIR Caution
.
Disable the inflatable restraint steering wheel module when performing this diagnostic. Refer to SIR Disabling and Enabling .
- Ignition ON, with a scan tool observe the Cruise On/Off Switch parameter. Verify the parameter changes each time the switch is actuated
- If the parameter reads ON at all times replace the cruise control switch.
- Ignition OFF, remove the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
- Disconnect the harness connector at the cruise control switch assembly.
- Ignition ON, test for 0 volts between the cruise control harness connector terminal 9 and ground.
- If voltage is present, test the circuit for a short to voltage.
- Ignition OFF, disconnect the X3 connector at the BCM.
- Test for less than 1.0 ohm between the cruise control harness connector terminal 9 and the BCM connector X3 terminal 22.
- If greater than the specified value, test the circuit for an open or high resistance.
- Test for infinite resistance between the cruise control harness connector terminal 9 and ground.
- If resistance is measured, test the circuit for a short to ground.
- If all circuits test normal, test the component. If the circuits and component tests are normal, replace the BCM.
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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.