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 INOPERATIVE - MTC
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Turn the ignition off. Remove and inspect Junction Block Fuse #1. Is the fuse open? Yes --> Go To 2 No --> Go To 4 |
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| 2 | Turn the ignition off. Replace Junction Block Fuse #1. Turn the ignition on. Turn the blower on and operate it in all speeds and modes. Does the blower motor operate properly without blowing the fuse? Yes --> Check the Fused Ignition Switch Output (RUN) circuit for an intermittent short to ground. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 3 |
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| 3 | Turn the ignition off. Turn the Blower switch off. Disconnect the Blower Motor harness connector. Measure the resistance between ground and the Fused Ignition Switch Output (RUN) circuit. Is the resistance below 10K ohms? Yes --> Repair the Fused Ignition Switch Output (RUN) circuit for a short to ground and replace the fuse. Perform BODY VERIFICATION TEST - VER 1 . No --> Replace the Blower Motor and fuse in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . |
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| 4 | Ensure Junction Block Fuse #1 is installed. Turn the Blower switch off. Disconnect the Blower Motor Resistor Block 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 the Blower Motor Driver circuit in the Blower Motor Resistor Block harness connector. Does the test light illuminate brightly? Yes --> Go To 5 No --> Go To 8 |
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| 5 | Turn the ignition off. Disconnect the A/C - Heater Control C2 harness connector. Connect a jumper wire between ground and the High Blower Motor Driver circuit in the A/C - Heater Control C2 harness connector. Turn the ignition on. Does the blower motor run at high speed? Yes --> Go To 6 No --> Go To 7 |
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| 6 | Turn the ignition off. Disconnect the A/C - Heater Control C2 harness connector. Measure the resistance between ground and the Ground circuit. Is the resistance below 5.0 ohms? Yes --> Replace the A/C - Heater Control in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . No --> Repair the Ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1 . |
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| 7 | Turn the ignition off. Disconnect the A/C - Heater Control C2 harness connector. Disconnect the Blower Motor Resistor Block harness connector. Measure the resistance of the High Blower Motor Driver circuit between the A/C - Heater Control C2 harness connector and the Blower Motor Resistor Block harness connector. Is the resistance below 5.0 ohms? Yes --> Replace the Blower Motor Resistor Block in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . No --> Repair the High Blower Motor Driver circuit for an open. Perform BODY VERIFICATION TEST - VER 1 . |
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| 8 | Turn the Blower switch off. 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 the Blower Motor Driver circuit in the Blower Motor harness connector. Does the test light illuminate brightly? Yes --> Repair the Blower Motor Driver circuit for an open. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 9 |
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| 9 | Turn the Blower switch off. 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 the Fused Ignition Switch Output (RUN) circuit in the Blower Motor harness connector. Does the test light illuminate brightly? Yes --> Replace the Blower Motor in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . No --> Repair the Fused Ignition Switch Output (RUN) circuit for an open. Perform BODY VERIFICATION TEST - VER 1 . |
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