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 MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1913 (POWER DOOR LOCK SYSTEM AND RELEASE SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2495CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban C2500, 6.0 U
Circuit/System Testing
2006 Chevrolet Suburban C2500, 6.0 USECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
- Connect a test lamp between control circuit terminal 1 and ground.
- Ignition ON, command the liftgate to OPEN by pressing and releasing the liftgate interior control switch. The test lamp should illuminate while commanding the OPEN state.
- If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the liftgate control module.
- If the test lamp is always ON, test the control circuit for a short to voltage, if the circuit tests normal, replace the liftgate control module.
- Ignition OFF, connect a test lamp between the control circuit terminal 3 and ground.
- Connect a 3 A fused jumper wire between the signal circuit terminal 6 and ground.
- Ignition ON, command the liftgate to CLOSE by pressing and releasing the liftgate interior control switch. The test lamp should illuminate while commanding the CLOSE state.
- If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the liftgate control module.
- If the test lamp is always ON, test the control circuit for a short to voltage, if the circuit tests normal, replace the liftgate control module.
- If all circuits test normal, test or replace the liftgate latch assembly.
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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.