Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step tests for blower motor operation in the OFF setting.
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This step determines if the instrument panel integration module (IPM) is receiving an OFF request from the HVAC control module.
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The blower motor will operate at all times if the blower motor housing is shorted to ground or the blower motor control circuit is shorted to ground.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The blower motor is ON while the HVAC control is in the OFF position. | ||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | |
Does the blower motor operate? | -- | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | |
With the scan tool, observe the Commanded Blower parameter in the Heating and Air Conditioning data list. Does the scan tool indicate that the Commanded Blower parameter is near the specified value? | 0% | Go to Step 5 | Go to Step 4 | |
4 |
Does the scan tool indicate that the Commanded Blower parameter is near the specified value? | 0% | Go to Step 7 | Go to Step 8 |
5 | Disconnect the instrument panel integration module (IPM). Does the blower motor continue to operate? | -- | Go to Step 6 | Go to Step 8 |
Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 9 | |
7 | 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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 10 |
8 | Inspect for poor connections at the harness connector of the IPM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 11 |
9 | Replace the blower motor control processor. Refer to Blower Motor Control Processor Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- |
10 | Replace the HVAC control module. Refer to HVAC Control Module Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- |
11 |
Important: Perform the recalibration procedure for the IPM. Replace the IPM. Refer to Instrument Panel Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 12 | -- |
12 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
