Test Description

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.

The numbers below refer to the step numbers on the diagnostic table.

5. This step tests the output of the blower motor switch in each speed position and through each blower motor control circuit.
6. Test the circuit that did not illuminate the test lamp in Step 5.

Fig 1: Blower Motor Malfunction (Steps 1-8)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Blower Motor Malfunction (Steps 9-16)

Courtesy of GENERAL MOTORS CORP.