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Removal (California)

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The Intake Air Heater (IAH) relay is located inside the IAH relay controller housing.
  1. Disconnect the negative battery cables. Loosen the outlet duct clamp at the upper intake manifold. Remove the upper intake manifold cover from the outlet duct. Remove the upper intake manifold cover.
  2. Disconnect the engine harness electrical connector. See Figure. Disconnect the IAH relay electrical connector. Reposition the battery cable boots. See Figure. Remove the battery cable nuts and cables from the IAH relay controller. Reposition the cables.
  3. Remove the IAH relay controller bolts. Remove the IAH relay controller. Remove the IAH relay controller cover. Remove the IAH relay controller nuts and washers.
  4. Using 2 screwdrivers, disengage the IAH relay assembly from the controller housing. See Figure. Remove the IAH relay assembly from the housing. Remove the IAH relay.
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