Checking the wiring

Check control module terminal #B20 and damper motor connector terminal #1. Check for contact resistance and oxidation. Check for loose connections. Check for damage carefully.

Check the signal cable between control module terminal #B20 and damper motor terminal #1. Check for an intermittent open-circuit.

Check the wiring between the defroster damper motor and the recirculation damper motor. Check for an intermittent open-circuit.

Check the signal cable between control module terminal #B20 and damper motor terminal #1. Check for an intermittent short-circuit to supply voltage.

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