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 C1500, 5.3 ZREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1913 (POWER DOOR LOCK SYSTEM AND RELEASE SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2494 (POWER LIFTGATE)CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban C1500, 5.3 Z
Circuit/System Testing
2006 Chevrolet Suburban C1500, 5.3 ZSECTION 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 handle switch.
- Test for less than 10 Ξ© between the low reference circuit terminal B and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance between the connector and the circuit splice.
- Ignition OFF, disconnect the harness connector at the liftgate close switch.
- Test for less than 10 Ξ© between the low reference circuit terminal A and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance between the connector and the circuit splice.
- Ignition ON, verify the scan tool Liftgate Handle Sw. Status parameter is Inactive.
- If not the specified value, test the signal circuit terminal D at the liftgate close switch for a short to ground. If the circuit tests normal, replace the liftgate control module.
- Connect a 3A fused jumper wire between the signal circuit terminal D and ground. Verify that the scan tool Liftgate Handle Sw. parameter is Active.
- If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the liftgate control module
- Ignition OFF, connect the harness connector at the liftgate close switch.
- Ignition ON, observe the scan tool Liftgate Handle Sw. Status parameter while pressing and releasing the liftgate close switch, the reading should change between Active and Inactive
- If the value is always Inactive or always Active, test or replace the liftgate close switch.
- If all circuits test normal, test or replace the liftgate handle 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:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.