I replaced both H1 bulbs on my 2002 hyundai XG350 and the normal daytime lights work fine but when Itry to use the hi beams to flash another driver they don't respond although the blue light indicato

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first check both low beam bulbs i have seen several burn out at the same time ,you can test them with battery voltage if they work then look in the under hood fuse box for low beam fuse

The day time running lamps are the high beam lamps , just going through the DRL resistor . Your low beam bulb could be bad (open) . Check voltage with DVOM - digital volt ohm meter , there should be three wires at the headlamp socket , check the orange wire for battery voltage with low beams on .

Fuses?? Get a multimeter & check for voltage to plugs.

Your van has dual diligent headlamp bulbs, that means each headlight has one bulb that serves as high beam and low beam. What has most likely happened is on one side the low beam filament has burnt out, and on the other side the high beam filiment has burnt out. The daytime running lights are just the high beam filament running on reduced power, so if the high beam doesn't work on one side, that same side will have no daytime running light. Replace both headlamp bulbs with matching, good quality bulbs.

Have you tried replacing the bulbs? My daytime/low beams work after replacing the bulbs

There could be a fuse for each low beam light either under the hood or under the dash. If not, then prob both low beams are bad.

If you have daytime run lights, the following may be of help.

There is a daytime running light module that controls both low beams and the daytime running lights. The low beam bulbs may be OK. The high beams will work fine as they are not controlled through the module.

It may be possible to disable the daytime run lights by cutting the yellow wire going into the module and then connecting it to ground. Tape off the other end.

This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya

Sounds like you need a bulb,the daytime running lights send power to the high beam wire so they look like low beam lights are on but really they are high beam lights running on low voltage.

manual headlamps

Visual Inspection Chart
Mechanical Electrical

• Headlamp switch
• Multifunction switch

• Central junction box (CJB) fuse:
  • 7 (30A)
  • 30 (15A)
  • 46 (10A)
  • 47 (10A)
• Circuitry
• Headlamp bulbs
• Daytime running lamp (DRL) relay No.1

Autolamps

Visual Inspection Chart Mechanical Electrical

• Headlamp switch

• Central junction box (CJB) fuses:
  • 19 (5A)
  • 56 (30A)
• Circuitry
• Headlamp bulb
• Daytime running lamps (DRL) full relay No.1 (if equipped)
• Vehicle security module
• Photocell

If autolamp system, Vehicle security module has a headlamp rela inside of it. under left side of dash.

take a look to you DRL unit, it might be the cause, but usually, when the Daytime running light unit (DRL) is faulty, either the bulbs and the clusters lights are not working anymore.... might worth taking a look on that