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High and low beam headlights not working properly

Tiny
JJAYMECH
  • MEMBER
  • 2002 MAZDA PROTEGE
  • 2.0L
  • 4 CYL
  • 2WD
  • 85,000 MILES
On low beam driver side okay, but passenger side nothing. On high beam driver side okay, but passenger side dim. Also on high beam the low beam filaments glow slightly. Could it be a poor ground connection? Do you have a wiring diagram for the headlight circuit? I can do voltage checks? A harness diagram would really help.
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Wednesday, October 23rd, 2019 AT 1:16 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Welcome to 2CarPros.

If you have one of the elements dimly glowing, it is most likely a bad ground causing power to back feed through the light.

I attached schematics below. There are two different conditions, with DRL and without. Now, to make them readable, I had to break each one into parts. The first three pics are without DRL. I overlapped them so you can follow them

Pictures 4 through 6 are with DRL.

Let me know if this is what you needed.

Joe
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Wednesday, October 23rd, 2019 AT 8:14 PM

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