Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: Air recirculation is inoperative or is always ON. | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Does blower motor run in the desired speed position? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 |
Does the test lamp illuminate and the lightness increase? | Go to Step 9 | Go to Step 4 |
4 |
Does the test lamp illuminate and the lightness increase? | Go to Step 6 | Go to Step 5 |
5 | Test the speed control circuit of blower motor in HVAC control module for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 11 |
6 | Test battery position circuit of blower motor control processor for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 7 |
7 | Test the ground circuit of blower motor control processor for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 8 |
8 | Test fan control circuit of blower motor control processor for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 10 |
9 | 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 15 | Go to Step 12 |
10 | 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 15 | Go to Step 13 |
11 | 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 15 | Go to Step 14 |
12 | Replace the blower motor. Refer to Blower Motor Replacement . Have you finished the replacement? | Go to Step 15 | -- |
13 | Replace the blower control processor. Refer to Blower Motor Control Module Replacement . Have you finished the replacement? | Go to Step 15 | -- |
14 | Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming. Have you finished the replacement? | Go to Step 15 | -- |
15 | Operate the system to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |