Climate Control Resets When Car is Started

[Erebus]

Dear All,

Re 2006 Aurion Presara

It has been a while since my last post, basically because I have had very few significant issues! The car has been awesome!

I currently have a very strange issue with the settings on the AC Controller being lost. It happens after the car has been sitting unused for a while (usually overnight). When I start the car all of the AC control screens are blank (the front screen demister light is flashing) and after one or two minutes the unit starts up. I then have to push Auto and the unit gets going with 25 degrees C on both sides (presumably this is a default setting?). Otherwise the air con works great. Short periods between drives the car is fine. Long periods is when I have the issue.

So far I have checked the ECU-B No 1 fuse (no fault found). I have even actually replaced the control unit itself (as I had a spare when I replaced the sat nav assembly. Still no change.

Any ideas what it could be please? Many thanks in advance, Rob

Edited December 31, 2018 by Erebus
Spelling mistake

[Kevinck1]

I have exactly the same problem with a 2015 RAV4. The car has travelled very low kms and has just had the original factory battery replaced as RACV tested and advised that the battery was nearing end of life and that the low voltage may have caused this problem. 

However after change to a brand new battery, the same problem still exists as the post from Erebus.

Does anyone know of a solution please?

Kevin