Pontiac grand am 2004 left brake light and center mount

Stop Lamps
The body control module (BCM) is responsible for controlling the stop lamps. When the driver presses the brake pedal, the BCM will receive a signal from the brake switch. The BCM then supplies battery positive voltage to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL).

Which one isn't working ? Left - right or center high mount

All rear brake lights on the GM vehicle line go through the Directional switch inside the column. I have found this to be bad on some N-Bodies... but also if it has a separate Hazard flasher unit and switch, you may want to try that first.. easier to replace and less expensive... all brake lights and directionals go through that unit as well.

replace bulb the the brake filament part is burnt their are 2 filaments in the bulb

If the center light works then the brake light
switch is working. The brake light bulb is
inside the trunk. The bulb holder rotates
to lock in and out. Ck Autozone, they will
even help you install it.

has to be somwhere in the wiring for the tail lamp brk light. if the high mount works the switch is good. did you put the correct bulbs in? they may share a common ground independant of the other lights.

Im having the same issue on my 04 Quad Cab Dakota. Changed out the brake light switch but still no brake lights. You have any luck ?

go to the brake pedal siwtch and check voltage there, the center light is not on the same circuit

NOT a Fuse Problem the Light Fixture itself is at Fault Replace it to Cure this Problem

The brake light switch needs to be checked for adjustment or if its shorted out. Its mounted and a bracket ajacent to your brake pedal

1992–98 GRAND AM AND ACHIEVA

1. Disconnect the negative battery cable.
2. Pull the center high-mount stop lamp cover to disengage the retaining tabs.
3. Unfasten the lamp retaining screws.
4. Remove the sockets using a suitable prybar to release the retaining tabs.
5. Detach the bulbs from their sockets.
6. Using a suitable prybar to release the tabs, remove the lamp lens. Fig. 14: View of the center high-mount stop lamp assembly — 1995 Grand Am and Achieva shown