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Casper23

Heater/AC not working

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I am currently having a problerm with my Toyota IQ2 2009. The heater control assembly unit (55900-74010) has a blank screen and none of the functions for heater, A/C work with the exception of the hazard lights. We have bought a replacement unit which hasn't solved the problem, taken the car to 2 garages (one being toyota) and they have checked the fuses, relays and were unable to locate the issue. The LED display screen lights up when turning on the engine however it is blank. 

Any ideas where the problem may be coming from? In this weather I am unable to clear the windscreen so I am eager to get this problem sorted. Any help would be much appreciated!

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