I’ve had the car 2 years approximately, wife drives it maybe 5 kms each day for work.
In a big city, doing daily 5km trips in stop start traffic will kill a battery in no time.
A failing battery causes voltage issues which are the bane of the VE where the system sees all sorts of faults that don’t obviously relate back to the failing battery.
Even though you’re doing country kms and such shouldn’t be as bad as doing the same short trips in a city, 5km may still not be long enough to charge the battery appropriately. As such I’d connect a charger and fully charge the battery and then get it load tested to ensure it’s aok.
If the charged battery fails the load test, you may have found the cause of some of the dash lights.
If the battery tests ok, more investigation is required and here the Diagnostic Trouble Codes (DTC’s in Holden speak, fault codes in general) can help guide the diagnostic process.
As to a grinding noise when braking, that sounds mechanical. If you have any mechanical aptitude, take off the wheel where the noise seems to come from and check the condition of the rotor surface and how much meat is left on the brake pads. Why, because most pads have a metal tang that will touch the rotor when the pads are at the wear limit and the scraping/squeezing noise on brake applications is an audible indication to change your brake pads. Really, any competent mechanic would have checked this as a matter of course.