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Brake lights on a 2002 Gran Prix not working but the the one in the back glass is you replaced bulbs but the brake lights still do not work Would it be the brake light switch?
Wiki User
∙ 14y ago
I'm not familiar with your 2002 Gran Prix, but the problem you describe is universal to all vehicles.
The fact that the "third" brake light [in the rear window package tray] IS WORKING, indicates that the brake light switch IS WORKING properly!!!!!
That suggests that the reason that the other two brake lights are not working is that there is an "open" condition in the wiring circuit to the other two brake lights. This is confirmed by the fact you replaced the lamps [bulbs] in those other lamp holders with known good lamps.
There could be several causes for an open circuit, but the most common include:
- One of the connector plugs in the wiring harness to the brake lights has become disconnected, or
- Corrosion has built up inside of one of the connectors [one that feeds both brake lights, which will be in the circuit "ahead" [upstream] of where the wiring harness "splits" off between the two brake lights].
- Very remote is the possibility that the ground wires on both light assemblies has been disconnected, cut, or corroded.
Wiki User
∙ 14y ago
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