Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE - BLOWER MOTOR SPEEDS INCORRECT - MTC
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Turn the Blower switch off. Turn the ignition on. Does the blower run? Yes --> Go To 2 No --> Go To 4 |
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| 2 | Turn the ignition off. Disconnect the A/C - Heater Control C2 harness connector. Disconnect the Blower Motor Resistor Block harness connector. Measure the resistance between ground and each of the Blower Motor Driver circuits. Is the resistance below 10K ohms on any of the circuits? Yes --> Repair the Blower Motor Driver circuit(s) for a short to ground. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 3 |
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| 3 | Turn the ignition off. Disconnect the Blower Motor harness connector. Disconnect the Blower Motor Resistor Block harness connector. Measure the resistance between ground and the Blower Motor Driver circuit in the Blower Motor harness connector. Is the resistance below 10K ohms? Yes --> Repair the Blower Motor Driver circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1 . No --> Replace the A/C - Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . |
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| 4 | Turn the ignition off. Disconnect the A/C - Heater Control C2 harness connector. Turn the ignition on.
NOTE:
The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. Using a 12-volt test light connected to ground, back probe each of the Blower Motor Driver circuits (cavities 2, 3, 7, and 10) in the A/C - Heater Control C2 harness connector. Does the test light illuminate brightly on each circuit? Yes --> Go To 5 No --> Go To 7 |
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| 5 | Turn the ignition off. Disconnect the A/C - Heater Control C2 harness connector. Disconnect the Blower Motor Resistor Block harness connector. Measure the voltage of each of the Blower Motor Driver circuits (cavities 2, 3, 7, and 10). Is there any voltage present? Yes --> Repair the Blower Motor Driver circuit(s) for a short to voltage. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 6 |
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| 6 | Turn the ignition off. Disconnect the A/C - Heater Control C2 harness connector. Disconnect the Blower Motor Resistor Block harness connector. Measure the resistance between the Low Blower Motor Driver circuit and the M1, M2, and High Blower Motor Driver circuits. Measure the resistance between the M1 Blower Motor Driver circuit and the M2 and High Blower Motor Driver circuits. Measure the resistance between the M2 Blower Motor Driver circuit and the High Blower Motor Driver circuit. Is the resistance below 10K ohms between any of the circuits? Yes --> Repair the shorted Blower Motor Driver circuits. Perform BODY VERIFICATION TEST - VER 1 . No --> Replace the A/C - Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . |
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| 7 | Turn the ignition off. Turn the Blower switch to the off position. Disconnect the A/C - Heater Control C2 harness connector. Disconnect the Blower Motor Resistor Block harness connector. Measure the resistance of each Blower Motor Driver circuit between the Blower Motor Resistor Block harness connector and the A/C - Heater Control C2 harness connector. Is the resistance below 5.0 ohms on each of the circuits? Yes --> Replace the Blower Motor Resistor Block in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . No --> Repair the Blower Motor Driver circuit(s) for an open. Perform BODY VERIFICATION TEST - VER 1 . |
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