Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views Definition: The blow motor does not work in any speed position. | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Blower Motor Malfunction | |
2 |
Does blower motor work in any speed position? | Go to Blower Motor Malfunction | Go to Step 3 |
3 |
Does the test light illuminate? | Go to Step 14 | Go to Step 4 |
4 | Probe the supply voltage circuit of the blower motor with a test lamp that is connected to ground well. Does the test light illuminate? | Go to Step 9 | Go to Step 5 |
5 |
Does the test light illuminate? | Go to Step 6 | Go to Step 17 |
6 |
Does the test light illuminate? | Go to Step 7 | Go to Step 8 |
7 | Test blower motor supply voltage circuit for open, short to ground or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 13 |
8 | Test blower motor relay control circuit for open, short to voltage or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 16 |
9 |
Does the test light illuminate? | Go to Step 11 | Go to Step 10 |
10 | Test blower motor speed control circuit for open, short to ground, short to voltage or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 16 |
11 | Test the ground circuit of blower motor control processor for open or a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 12 |
12 | Test the ground circuit between blower motor and the control processor for open, short to voltage or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 15 |
13 | 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 . Did you find and correct the condition? | Go to Step 22 | Go to Step 18 |
14 | Inspect for poor connections at the harness connector of the blower motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 22 | Go to Step 19 |
15 | 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 . Did you find and correct the condition? | Go to Step 22 | Go to Step 20 |
16 | 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 . Did you find and correct the condition? | Go to Step 22 | Go to Step 21 |
17 | Repair the battery positive voltage circuit of the blower motor relay. Refer to Wiring Repairs . Is the trouble corrected? | Go to Step 22 | -- |
18 | Replace the blower motor relay. Have you finished the replacement? | Go to Step 22 | -- |
19 | Replace the blower motor. Refer to Blower Motor Replacement . Have you finished the replacement? | Go to Step 22 | -- |
20 | Replace the blower control processor. Refer to Blower Motor Control Module Replacement . Have you finished the replacement? | Go to Step 22 | -- |
21 | Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming. Have you finished the replacement? | Go to Step 22 | -- |
22 | Operate the system to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |