Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: HVAC Schematics DEFINITION: The blower motor is inoperative in all speed positions. | ||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the blower motor operate in any of the speed positions? | -- | Go to Blower Motor Malfunction | Go to Step 3 |
3 |
Does the scan tool indicate that the Commanded Blower parameter is near the specified value? | 100% | Go to Step 4 | Go to Step 12 |
4 |
Does the test lamp illuminate? | -- | Go to Step 10 | Go to Step 5 |
5 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 6 |
6 | 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 7 |
7 |
Important: The blower motor control processor connector and the HVAC control module connectors must be connected to correctly perform the test.
Is the voltage near the specified values for each commanded state? | 5.0 V OFF 1.5 V ON | Go to Step 11 | Go to Step 8 |
8 |
Does the voltage measure near the specified value? | 5.0 V | Go to Step 12 | Go to Step 9 |
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 11 |
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 | Replace the HVAC control module. Refer to HVAC Control Module Replacement . 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 |
