Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: HVAC Blower Control Schematics , HVAC Compressor Control Schematics , and HVAC Air Delivery/Temperature Control Schematics DEFINITION: The auxiliary 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 |
2 |
Does the auxiliary blower motor operate in any of the speed positions? | Go to Step 3 | |
3 |
Does the test lamp illuminate? | Go to Step 6 | Go to Step 4 |
4 | Test the battery positive voltage circuit of the rear 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 10 | Go to Step 5 |
5 | Test the high speed control circuit of the rear 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 10 | Go to Step 7 |
6 | Inspect for poor connections at the harness connector of the rear 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 10 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the rear 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 rear blower motor. Refer to Auxiliary Blower Motor and Fan Replacement in Heating Ventilation and Air Conditioning. Did you complete the replacement? | Go to Step 10 | -- |
9 | Replace the rear HVAC control module. Refer to Auxiliary 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 2 |
