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When Only One Brake Light Does Not Work

The fact that your passenger side brake light IS working is good news. That means that the brake light circuit is working [fuse, brake light switch, wiring to the back of the vehicle, etc.].

Because the rest of the system works when the driver's side doesn't tell us that the problem is between the point in the wiring harness where the harness "splits" to go to the left and right brake light assemblies, AND that the problem is IN that left side.

Without doing a "hands-on troubleshooting" of your vehicle no one can precisely tell you what the defect is. You will need to check that portion of the wiring system and find/identify the fault, and repair it.

There could be several causes for this and here are the ones that come to my mind at the moment:

  • 1. The filament in the left brake light bulb has burned out and the bulb needs to be replaced,
  • 2. One of the inline connectors to the left brake light assembly has become disconnected, loose, or the connector internal metal contacts corroded,
  • 3. Water, and thus corrosion has gotten into the bulb socket, and has created an open circuit conditon for just the left brake light contacts.
  • 4. The wire to the left brake light has been cut or broken.

There may be other causes but these are the ones that come to mind at this moment.

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Wiki User

15y ago

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