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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 349 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC B0158, B0163, B0168, B0173, B0178, B0509, B0514, B3578, or B3583 >> Circuit/System Verification

Circuit/System Verification

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.
  1. Measure actual outside air temperature using a thermometer. Compare this value to the scan tool Outside Air Temp. Raw parameter. The measured temperature should be within 5 degrees of parameter.
    • If not within the specified range, refer to Ambient / Inside Air Temperature Sensor Circuit Malfunction below.
  2. Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Inside Air Temp. Sensor parameter and Aux. Inside Air Temp. parameter. The measured temperature should be within 5 degrees of parameter.
    • If not within the specified range, refer to Ambient / Inside Air Temperature Sensor Circuit Malfunction below.
  3. Measure actual temperature using a thermometer at each of the duct temperature sensors. Compare this value to the appropriate scan tool Duct Actual parameter. The measured temperature should be within 5 degrees of appropriate Duct Actual parameter.
    • If not within the specified range, refer to Duct Temperature Sensor Circuit Malfunction below.
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