Step | Action | 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 Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 5 |
4 | Test the ground circuit of the 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 10 |
5 |
Does the test lamp illuminate? | Go to Step 8 | Go to Step 6 |
6 | Test the low blower motor control circuit of the blower motor resistor 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 |
Does the test lamp illuminate? | Go to Step 11 | Go to Step 12 |
8 | Test the blower motor supply voltage circuit between the blower motor and the blower motor relay 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 9 |
9 | Inspect for poor connections at the harness connector of the blower motor relay. 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 |
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 14 |
11 | Inspect for poor connections at the harness connector of the HVAC control assembly. 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 |
12 | Repair the ignition 3 voltage circuit of the HVAC control assembly. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | -- |
13 | Replace the blower motor relay. Did you complete the replacement? | Go to Step 16 | -- |
14 | Replace the blower motor. Refer to Blower Motor Replacement in Heating, Ventilation and Air Conditioning. Did you complete the replacement? | Go to Step 16 | -- |
15 | Replace the HVAC control assembly. Refer to Heater and Air Conditioning Control 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 3 |