Test Description

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. 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

2. This step will determine if one or more blower speeds are inoperative.
3. This step determines if the HVAC control module and blower motor control processor are attempting to control the blower motor speed.
5. The measured voltage on the blower speed control circuit should steadily increase from 0 V to 8.0 V as the blower speed is adjusted from the minimum speed position to the maximum speed position.

Fig 1: Blower Motor Malfunction Diagnosis (Steps 1-7)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Blower Motor Malfunction Diagnosis (Steps 8-14)

Courtesy of GENERAL MOTORS CORP.