Test Description
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This step tests for a short to voltage in one of the speed control circuits.
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If no fault is found in Step 3 it is assumed that the blower motor relay is stuck closed and the blower motor will operate in high speed all the time.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you review the Control Assembly Description and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms |
2 |
Does the blower motor turn off? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
Does the test lamp illuminate? | -- | Go to Step 4 | Go to Step 7 | |
4 | Test the suspect speed control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 5 |
5 | Inspect for shorted connections at the heater-A/C control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct a condition? | -- | Go to Step 8 | Go to Step 6 |
6 | Replace the heater - A/C control. Refer to Control Assembly Replacement . Did you complete the replacement? | -- | Go to Step 8 | -- |
Replace the blower motor resistor. Refer to Blower Motor Resistor Replacement . Did you complete the replacement? | -- | Go to Step 8 | -- | |
8 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
