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Blower Motor Always On

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Blower Motor Always On

Step Action Value(s) Yes No
Schematic Reference: HVAC Schematics 
Connector End View Reference: HVAC Connector End Views 
DEFINITION: The blower motor is ON while the HVAC control is in the OFF position.
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Turn ON the ignition, with the engine OFF.
  2. Turn OFF the HVAC controls.
Is the blower motor OFF?		 - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3
  1. Install a scan tool.
  2. With the scan tool, observe the Desired Blower Mtr Speed parameter in the Heating and Air Conditioning data list.
Does the scan tool indicate that the Desired Blower Mtr Speed parameter is near the specified value?		 0 counts Go to Step 4  Go to Step 7 
4 Disconnect the HVAC control module.
Does the blower motor continue to operate?		 - Go to Step 5  Go to Step 7 
5 Inspect or test the blower motor housing and the blower motor speed control circuit in the blower motor harness for a short to ground. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 6 
6 Inspect for poor connections at the harness connector of the blower motor control processor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
7 Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
8 Replace the blower motor control processor. Refer to Blower Control Module Replacement .
Did you complete the replacement?		 - Go to Step 10  -
9 Replace the HVAC control module. Refer to HVAC Control Module Replacement  in Computer/Integrating Systems for replacement, setup and programming.
Did you complete the replacement?		 - Go to Step 10  -
10 Operate the system in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 3 
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