Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Were you sent here from the HVAC Diagnostic System Check? | -- | Go to Diagnostic System Check | |
2 |
Does the scan tool indicate the Desired Blower Motor Speed increasing and decreasing in correct relation to the blower speed control switch operation? | -- | ||
3 |
Does the test light illuminate? | -- | ||
4 | Connect a test light test from the blower motor control module connector feed circuit 1342 to the ground circuit 150. Does the test light illuminate? | -- | ||
5 | Repair the high resistance in the blower motor control module feed circuit 1342. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
6 | Repair the high resistance in the blower motor control module ground circuit 150. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
7 |
Does the test light illuminate? | -- | ||
8 | With the test light connected as in the previous step, set the blower motor speed control from high to low. Does the test light dim as the blower motor speed setting is reduced? | -- | ||
9 | Inspect and repair the blower motor harness connector for poor connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | ||
10 | Inspect and repair the blower motor body or metal flange for a short to ground. Did you find and correct the condition? | -- | ||
11 | Replace the blower motor. Refer to Blower Motor and Fan Replacement . Is the repair complete? | -- | -- | |
12 |
Is the voltage measured at or near the specified value? | 5 V | ||
13 | Test and repair the blower speed control signal circuit 63 for a short to ground or voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | ||
14 |
Is the voltage measured at or near the specified value? | 0.25 V to 1.25 V | ||
15 | Test and repair the blower speed control signal circuit 63 for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | ||
16 | Inspect and repair the blower motor control module harness connector for poor connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | ||
17 | Replace the blower motor control module . Refer to Blower Motor Control Module Replacement . Is the repair complete? | -- | -- | |
18 | Inspect and repair the HVAC control assembly harness connector for poor connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | ||
19 | Replace the HVAC control assembly. Refer to Control Assembly Replacement . Is the repair complete? | -- | -- | |
20 |
Did you correct the condition? | -- | System OK | Go to Diagnostic System Check |
