CX-7 Climate control issues, help!

2010 Mazda Cx7 in the uk.Can anyone help? Recently changed my car battery and all systems came back except my climate controls have stopped working,no blower ,ac or temperature control ,it’s just dead.Also
there is no display at all on the lower segment of the audio display which normally shows temperature and blower speeds.Additionally the external ambient temp is not displayed on the sat nav display next to the clock.I have checked the ac fuses in engine compartment,passenger and relay box, also swapped out relays and still no joy.Could a faulty ambient sensor which then looses power (because of battery swap)cause the climate control module to malfunction.PS also disconnected battery again and discharged voltage in car to try and reset module.
Thank you