Test Description

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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.
3. If the auxiliary blower motor operates correctly from the rear auxiliary HVAC control assembly, the auxiliary blower motor and auxiliary blower motor resistor assembly are functioning properly.
4. This step tests for an open in one of the blower motor speed control circuits and determines if the auxiliary blower motor and auxiliary blower motor resistor are functioning correctly.

Fig 1: Diagnosis Procedure Blower Motor Malfunction - Auxiliary (Step 1 To 6)
Courtesy of GENERAL MOTORS CORP.

Fig 2: Diagnosis Procedure Blower Motor Malfunction - Auxiliary (Step 7 To 17)
Courtesy of GENERAL MOTORS CORP.

Fig 3: Diagnosis Procedure Blower Motor Malfunction - Auxiliary (Step 18 To 24)
Courtesy of GENERAL MOTORS CORP.