2001 swift headlights blink on low and somtimes go out momentarly only on low not on bright

bad connection or bad earth check all connection or bulb

codes p0456 and p0442

this sounds like a earthing problem , so check the wiring for the head lights, see if any wires are trapped between something, bare wire touching car body , anythingthat doesn't look correct, could also be the indicator lever itself with a problem , but check the headlight wiring first

You have a blown headlight fuse that controls the low beam headlights. Look in the fuse/relay box under the hood.

The ground wire is bad on the dim side.

I think that many 1990s and even some 1980s GM vehicles with seemingly 4 headlight systems actually use only 2 at a time.

My 1990 Oldsmobile Cutlass Calais, for instance, had 2 high beams that went on independently of the 2 low beam lights when switched with the turn signal lever.

In the 1970s the GM vehicles had 4 headlight systems where all 4 headlights would go on, but they used sealed beams rather than the capsule lights that are used nowadays.

For instance, our 1976 Cadillac Seville has a 4 headlight system that lights up 4 headlights on the high beam mode.

Good luck on seeing at night with the current set up.

Test the leads to the bulbs while the low beams are on and then when the brights are on. If you have good bulbs & fuses with no power on low, the problem is most likely the bright/dim switch.
Not exactly sure of the Acura layout, but the covers over the steering shaft should remove with several screws to allow access to the switch (usually the turn signals are also the bright/dim switch) Test the leads out to the headlights from the bright/dim switch, that will tell you if the switch is bad.
Airbags are closely involved with this removal/replacement, it is NOT recommended for a amatuer to undertake.

dont replace the bulbs ...check the fuses first...each circuit has its own independent fuse...one for low beam one for high beam and a separate low voltage one for running lights...you may have 1 bad bulb at very worst that could have blown the fuse...why spend extra money on 2

I suggest testing the relay for your highbeams (under the hood) as it sounds the relay is stuck in the on position. If that doesn't work, you may have to test your high / low beam lever to see if the contacts are touching

Low beams are separate bulbs and could possibly both be burnt out