Blower Motor Always On - Auxiliary (VIN 6 excluding Envoy XUV)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Blower Motor Always On - Auxiliary (VIN 6 excluding Envoy XUV)
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The auxiliary blower motor operates with the HVAC controls in the OFF position. |
||||
| 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 Rear Blower Speed parameter in the REAR HVAC/RSA data list. Does the scan tool indicate that the Rear Blower Speed parameter is near the specified value? |
0% | Go to Step 4 | Go to Step 7 |
| 4 |
|
- | Go to Step 6 | Go to Step 5 |
| 5 | Test the auxiliary blower motor speed control circuit 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 auxiliary blower motor control processor. Refer to Wiring Repairs
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 auxiliary HVAC control module. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 10 | Go to Step 9 |
| 8 | Replace the auxiliary blower motor control processor. Refer to Blower Motor Processor Replacement - Auxiliary . Did you complete the replacement? |
- | Go to Step 10 | - |
| 9 |
IMPORTANT:
Perform the recalibration procedure for the auxiliary HVAC control module. Replace the auxiliary HVAC control module. Refer to HVAC Control Module Replacement - Auxiliary .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 2 |