08 Trailblazer SS. Low beams go off when I switch to high beams?

  • 2
    Welcome to Motor Vehicle Maintenance & Repair.Your question is not clear.can you please elaborate bit more
    – DhKo
    Commented Sep 20, 2017 at 14:01
  • 2
    Low beams are supposed to go off in all vehicles when switching to main beam. What exactly is your question?
    – Chenmunka
    Commented Sep 20, 2017 at 14:06
  • lows don't always go off... mine stay on as they are the outer ones.
    – Solar Mike
    Commented Sep 20, 2017 at 14:14
  • Low beams stay on on my vehicle with H4 bulbs
    – r.anderson
    Commented Sep 20, 2017 at 14:30
  • It depends on the bulb type, design of the lighting solution as well. Low beam uses a separate bulb and high uses a separate bulb in the 2008 Chevy TB. When engaged to high, both should remain 'on'. There is an underlying cause preventing this function. Commented Sep 21, 2017 at 10:56

1 Answer 1


It is probably the bulbs you are using. Low beams should be dual filament. If you are using single filament (or circuit for led) they will turn off.

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