Blower Motor Always On
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Blower Motor Always On
| Step | Action | Values | 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. |
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| 1 | Did you perform the HVAC Diagnostic System Check? | - | Go to Step 2 | Go to Diagnostic System Check - HVAC Systems - Automatic |
| 2 |
|
- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | 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 control circuit in the blower motor harness for a short to ground. Refer to Circuit Testing
and Wiring 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 Motor Control Processor Replacement . Did you complete the replacement? |
- | Go to Step 10 | - |
| 9 |
IMPORTANT:
Perform the recalibration procedure for the HVAC control module. Replace the HVAC control module. Refer to HVAC Control Module Replacement .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 |