Blower motor control processor would be a good guess but I'm not in the guessing business , you need to test power an grounds for lose connections or corrosion , check for DTC'S in the HVAC control panel an if none , there are three different diagnostic flow charts from Saturn service info .
Blower Motor Always On Blower Motor Inoperative Blower Motor Malfunction
Myself I'd say Blower motor malfunction flow chart !
1
Did you perform the Diagnostic System Check - Vehicle?
--
Go to Step 2
Go to
Diagnostic System Check - Vehicle
2
Place the blower motor switch in each speed position.
Does the blower motor operate at the desired speeds?
yes / no
Go to
Testing for Intermittent Conditions and Poor Connections
Go to Step 3
3
- Disconnect the harness connector of the blower motor control processor.
- Measure the voltage between the battery positive voltage circuit and the ground circuit of the blower motor control processor.
Does the voltage measure within the specified range?
10-14 V yes / no
Go to Step 4
Go to Step 6
4
- Connect the blower motor control processor.
- Disconnect the harness connector of the HVAC control module.
- Measure the voltage on the blower motor speed control circuit.
Does the voltage measure within the specified range?
4.5-5.5 V
Go to Step 7
Go to Step 5
5
Test the control circuit of the blower motor control processor for a high resistance. Refer to
Circuit Testing and
Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 12
Go to Step 7
6
Test the battery positive voltage circuit of the blower motor control processor for a high resistance. Refer to
Circuit Testing and
Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 12
Go to Step 9
7
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 .
Did you find and correct the condition?
--
Go to Step 12
Go to Step 10
8
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 .
Did you find and correct the condition?
--
Go to Step 12
Go to Step 11
9
Repair a high resistance in the ground circuit of the blower motor control processor. Refer to
Circuit Testing .
Did you complete the repair?
--
Go to Step 12
--
10
Replace the blower motor control processor. Refer to
Blower Motor Control Processor Replacement .
Did you complete the replacement?
--
Go to Step 12
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11
Replace the HVAC control module. Refer to
Control Module References for replacement, setup, and programming.
Did you complete the replacement?
--
Go to Step 12
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12
Operate the system in order to verify the repair.
Did you correct the condition?
--
System OK
Go to Step 2
Good luck , hope this helps !
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