04 trailblazer low beam headlights won’t workwork.

Asked by Derail1963 Aug 09, 2018 at 06:58 PM about the 2004 Chevrolet Trailblazer LT RWD

Question type: Maintenance & Repair

Running lights work and high beams work when I change the headlight switch
position. Checked fuses, swapped hdm relays 45 & 46, replaced dimmer and
headlight switch. Also replaced one of the bulbs, nothing worked. Anybody
have any other ideas?

1 Answer
11,555

FJ4072 answered 6 years ago

Is there voltage at the pigtail that goes into the bulbs when low beams are activated? If so, I'd go back to that HDM relay, try a new one, or try installing and re-installing several times to kind of clean the contacts on the fuse block and relay. I did that on my 1st TB, and it started working again, but didn't last long. FYI, there is a recall on this, dealer can fix for free, BUT not sure if there is a permanent fix yet. Last I checked, they were just replacing the HDM.

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