Blower Motor Inoperative - Auxiliary
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
Blower Motor Inoperative - Auxiliary
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The auxiliary blower motor is inoperative in all speed positions. |
||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 |
|
- | Go to Blower Motor Malfunction - Auxiliary | Go to Step 3 |
| 3 |
|
- | Go to Step 10 | Go to Step 4 |
| 4 | Test the battery positive voltage circuit of the auxiliary blower motor 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 blower motor speed control circuit of the auxiliary blower motor 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:
Ensure that the auxiliary blower motor resistor connector and the HVAC control module connectors are connected during this step in order to avoid misdiagnosis.
|
4-6.0 V | Go to Step 11 | Go to Step 7 |
| 7 |
|
4-6 V | Go to Step 9 | Go to Step 8 |
| 8 | Test the auxiliary blower motor speed control circuit of the HVAC control module for an open or a 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 11 |
| 9 | Test the auxiliary blower motor speed control circuit of the HVAC control module for a 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 auxiliary 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 auxiliary blower motor resistor. 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 auxiliary blower motor. Refer to Blower Motor Replacement - Auxiliary (With E59)
or Blower Motor Replacement - Auxiliary (Without E59)
in Heating, Ventilation and Air Conditioning. Did you complete the replacement? |
- | Go to Step 16 | - |
| 14 | Replace the auxiliary blower motor resistor. Refer to Blower Motor Resistor Replacement - Auxiliary
. Did you complete the replacement? |
- | Go to Step 16 | - |
| 15 | Replace the HVAC control module. Refer to Control Module References
in Computer/Integrating Systems for replacement, setup and programming. 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 |