Dashboard lights explainer

[AbsolutelyClueless]

Hi,

A few days ago I noticed the dashboard lights for ABS, VSC and TRC off were illuminating on my Toyota Avensis (04).

I haven't noticed anything untoward in the driving (brakes are fine) but can anyone explain what they mean, why they might have come on and what can be done (by myself or a garage) to remedy this.

Any help much appreciated

Thanks!

[SaruD.Sado]

If you want to determine the exact cause, you need to scan for trouble codes. There could be many reasons. Only diagnostics will tell. 
if the problem occurs in at least one of these blocks, corresponding light's will be illuminated.

ABS - If a fault develops in any part of the ABS, a warning light will usually be illuminated on the vehicle instrument panel, and the ABS will be disabled until the fault is rectified.
TRAC and VSC refer to traction control and electronic stability control, respectively. These are systems that are designed to prevent the vehicle skidding or otherwise coming out of control.

https://en.m.wikipedia.org/wiki/Anti-lock_braking_system
https://en.m.wikipedia.org/wiki/Electronic_stability_control
https://en.m.wikipedia.org/wiki/Traction_control_system