Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: HVAC Blower Control Schematics DEFINITION: The blower motor is ON while the HVAC control is in the OFF position. | ||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check |
2 |
Is the blower motor OFF? | -- | 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 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 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 control module. Refer to Blower Motor Control Module Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
9 | Replace the HVAC control module. Refer to Control Assembly 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 |
