Light is red when handbrake is on, and off when handbrake is off but DSC on.
Light is red when handbrake is on, and yellow when handbrake is off and DSC off too.
Yeah, it's weird. The on in the middle is traction control, which will let you slip the tyres but will still do the stability control stuff.
Yellow TC light + yellow hanbrake light = no safety nets beyond ABS.