intermittent electronic fault

[mart_dev]

Hi all. With regards to the 4x4, ABS, DSC fault; My vehicle will sometimes display this error while at other times it won’t. I find that it is more common after a longer (one or two days) of not having used the vehicle, and will then not do it again for a week or more. Upon checking the fault code which is always the same old transmission ECU, the fault description reads “SUPPLY VOLTAGE”. It’s worth noting that I have had the battery tested and although the battery centre did say it needs charging, they were happy with the condition thereof. Yes, I also thought (sometimes still do think) it may be battery but that doesn’t explain the sporadic nature of the fault…or does it? Also, since this fault first presented itself I have a permanent fault with the VAC module. It has a continual fault which reads “THIRD ROW SEATING AIR TEMPERATURE SENSOR” or something very close to it. Up until the sporadic 4x4, ABS, DSC fault this fault was not active. Coincidence or linked?
Please chip in if you feel you may have even a guess as to what it may be but if it helps your diagnosis: The cruise control functions, as does the hill descent control. The ABS functions (yes I’ve tested) and the digital speedo also works so I imaging the wheel speed sensors are okay. I have even floored it on my lawn to test the traction control…it works