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We would suggest that you first verify that the relay is properly functional by testing it or just replace it. If all of this tests OK, replace the relay.  If you still have the odd functioning, additional diagnotics will be needed for the ECU and climate control unit (as noted above).


If a properly working relay does not change anything, there may be a fault in the ECU circuit or the signals from the climate control unit, to the ECU.
The relay is energized (turned-on) by the ECU (engine Control Unit) grounding the circuit and allowing current to then flow through the relay’s coil.





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