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 | Inspect the BLO MOT fuse #51 for an open. Is the fuse open? | -- | ||
6 | Repair the short to ground in the blower control module feed circuit 1342. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
7 | Repair the open or high resistance in the blower motor control module feed circuit 1342. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
8 | Repair the open or high resistance in the blower motor control module ground circuit 150. Refer to Wiring Repairs . Is the repair complete? | -- | -- | |
9 |
Does the test light illuminate? | -- | ||
10 | 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? | -- | ||
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 |
