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Circuit/System Verification

WARNING: This page is about a different car, the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Key ON, engine OFF. Parking brake applied. Transmission in Neutral. Install a scan tool.
  2. While monitoring the Front Axle Actuator parameter of the Data Display function on the scan tool, shift the vehicle into 4WD HI. The front axle actuator parameter should display Active or Engaged. You should also be able to hear the axle actuator engaging.
  3. Shift the vehicle into 2WD HI. The Front Axle Actuator parameter should display Inactive or Disengaged. You should also be able to hear the axle actuator disengaging.
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