Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The blower motor is inoperative in all speed positions. | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | 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 test lamp illuminate? | -- | Go to Step 12 | Go to Step 4 |
4 | Test the blower motor supply voltage circuit of the blower motor control processor for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 5 |
5 | Test the blower motor speed control circuit of the blower motor control processor for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 6 |
6 |
Does the test lamp illuminate? | -- | Go to Step 10 | Go to Step 7 |
7 | Connect a test lamp between the battery positive voltage circuit of the blower motor control processor and a good ground. Does the test lamp illuminate? | -- | Go to Step 9 | Go to Step 8 |
8 | Repair the battery positive voltage circuit of the blower motor control processor. Refer to Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | -- |
9 | Repair the ground circuit of the blower motor control processor. Refer to Wiring Repairs . Did you complete the repair? | -- | Go to Step 18 | -- |
10 |
Does the voltage measure near the specified value? | 5 V | Go to Step 14 | Go to Step 11 |
11 | Test the blower motor speed signal circuit of the HVAC control module for an open, short to ground, or short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 13 |
12 | 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 18 | Go to Step 15 |
13 | 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 18 | Go to Step 16 |
14 | 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 18 | Go to Step 17 |
15 | Replace the blower motor. Refer to Blower Motor Replacement . Did you complete the replacement? | -- | Go to Step 18 | -- |
16 | Replace the blower motor control processor. Refer to Blower Motor Control Processor Replacement . Did you complete the replacement? | -- | Go to Step 18 | -- |
17 | Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 18 | -- |
18 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
