Component Testing
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect the IAH and measure between the temperature signal circuit terminal 1 on the IAH and a good ground for 15,000-18,000 ohms with a DMM.
- If the DMM does not measure between 15,000-18,000 ohms, replace the IAH.