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Test Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 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.

  1. 2:  This step checks for continuous operation of the blower motor.
  2. 3:  This step tests for a short to voltage in the blower motor control circuits.
Blower Motor Always On

Step Action Yes No
Schematic Reference: HVAC Schematics 
Connector End View Reference:  HVAC Connector End Views  
DEFINITION: The blower motor is ON while the blower motor switch is in the OFF position.
1 Did you perform the HVAC diagnostic system check? Go to Step 2  Go to Diagnostic System Check - HVAC Systems - Manual 
2 
  1. Turn ON the ignition, with the engine OFF.
  2. Place the blower motor switch in the OFF position.
Is the blower motor OFF?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 
IMPORTANT: The blower motor switch must remain in the OFF position during this step.
  1. Turn OFF the ignition.
  2. Disconnect the resistor assembly connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe each control circuit with a test lamp that is connected to a good ground.
Does the test lamp illuminate while the lamp is connected to any of the blower motor control circuits?		 Go to Step 4  Go to Step 5 
4 Test the appropriate control circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 6 
5 Inspect for bad harness connections at the blower motor resistor assembly. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 7 
6 Inspect for bad harness connections to the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 8 
7 Replace the blower motor resistor assembly. Refer to Blower Motor Resistor Assembly Replacement in Heating, Ventilation and Air Conditioning.
Did you complete the replacement?		 Go to Step 9  -
8 Replace the HVAC control module. Refer to HVAC Control Module Replacement (Buick)  or HVAC Control Module Replacement (Pontiac) .
Did you complete the replacement?		 Go to Step 9  -
9 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
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