Recirculation and fresh air
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Recirculation and fresh air
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1.
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Unplug the recirculation motor connector and check the voltage on pins 1 and 2 with recirculation activated and the ignition switched on. A reading of 12 V on pin 1 and 0 V on pin 2 should be obtained.
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2.
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Switch off recirculation and repeat the above measurement. A reading of 0 V on pin 1 and 12 V on pin 2 should be obtained. Try fitting a new recirculation motor if the readings are OK.
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3.
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Check the voltage at the rear of the 10-pin connector on the control panel. The recirculation motor should not be connected when the voltage reading is taken.
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Recirculation should give a reading of 12 V on pin 7 and 0 V on pin 6.
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Fresh air should give a reading of 12 V on pin 6 and 0 V on pin 7.
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4.
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Check the leads for continuity/shorting. Take readings across:
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Pin 6 of the control panel's 10-pin connector and pin 2 of the recirculation motor connector.
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Pin 7 of the control panel's 10-pin connector and pin 1 of the recirculation motor connector.
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5.
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If the readings taken as described in point 3 were not OK, try fitting a new pushbutton set.
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