Blower Motor Inoperative
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.
Blower Motor Inoperative
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The blower motor is inoperative in all speed positions. |
||||
| 1 | Did you perform the HVAC Diagnostic System Check? | - | Go to Step 2 | Go to Diagnostic System Check - HVAC Systems - Automatic |
| 2 |
|
- | Go to Blower Motor Malfunction | Go to Step 3 |
| 3 |
|
- | Go to Step 10 | Go to Step 4 |
| 4 | Test the battery positive voltage circuit of the blower motor control processor for an open, high resistance or short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 16 | Go to Step 5 |
| 5 | Test the ground circuit of the blower motor control processor for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 16 | Go to Step 6 |
| 6 |
IMPORTANT:
The blower motor control processor connector and the HVAC control module connectors must be connected to correctly perform the test.
|
2.0 V OFF 8.0 V ON |
Go to Step 7 | Go to Step 9 |
| 7 | Test the blower motor voltage supply circuit between the blower motor and the blower motor control processor for an open, short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 16 | Go to Step 8 | |
| 8 | Test the blower speed control circuit between the blower motor and the blower motor control processor for an open, short to voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 16 | Go to Step 11 | |
| 9 | Test the blower speed control circuit of the HVAC control module for an open, short to ground or short to voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 16 | Go to Step 12 | |
| 10 | Inspect for poor connections at the harness connector of the blower motor. 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 16 | Go to Step 13 |
| 11 | 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 16 | Go to Step 14 |
| 12 | 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 16 | Go to Step 15 |
| 13 | Replace the blower motor. Refer to Blower Motor Replacement
in Heating, Ventilation and Air Conditioning. Did you complete the replacement? |
- | Go to Step 16 | - |
| 14 | Replace the blower motor control processor. Refer to Blower Motor Control Processor Replacement . Did you complete the replacement? |
- | Go to Step 16 | - |
| 15 |
IMPORTANT:
Perform the recalibration procedure for the HVAC control module. Replace the HVAC control module. Refer to HVAC Control Module Replacement in Body Control System.Did you complete the replacement? |
- | Go to Step 16 | - |
| 16 | Operate the system in order to verify the repair. Did you correct the condition? |
- | System OK | Go to Step 2 |