Test Description
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
The number(s) below refer to the step number(s) on the diagnostic table.
2. This step will determine if one or more blower speeds are inoperative.
4. This step determines if the HVAC control module and blower motor control processor are attempting to control the blower motor speed.
6. The measured voltage on the blower motor speed control circuit should steadily decrease from 4.60 V to 1.1 V as the blower motor speed is adjusted from the minimum speed position to the maximum speed position.