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 MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 119 (DOOR LOCK SYSTEMS & DOOR HANDLES)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2494CIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C
Circuit/System Testing
2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Testing
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- Ignition OFF, disconnect the harness connectors at the liftgate exterior switch and liftgate interior switch.
- Ignition ON, verify the scan tool Liftgate Handle Sw. Status parameter is Inactive.
- If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the LGM.
- Ignition OFF, connect the harness connector at the exterior liftgate switch.
- Ignition ON, observe the scan tool Liftgate Handle Sw. Status parameter while pressing and releasing the exterior liftgate switch, the reading should change between Active and Inactive.
- If the parameter does not change, test or replace the exterior liftgate switch.
- If all circuits test normal, test or replace the interior liftgate switch.
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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.