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Half the brake lights

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Old Jun 2, 2019 | 10:05 PM
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Default Half the brake lights

The right rear pair of brake lights on my 2000 coupe won’t light up when the brakes are applied. The lights work for the turn signals and with the parking lights, but not the flashers.
The left side works fine..
any help would be appreciated
thanks
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Old Jun 3, 2019 | 12:40 AM
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Likely the turn signal switch.
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Old Jun 3, 2019 | 03:18 PM
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Originally Posted by lionelhutz
Likely the turn signal switch.
Another candidate to blame could be the hazard light switch. These are notorious. Plenty of threads on how they relate to non-functioning brake lights.
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Old Jun 3, 2019 | 10:37 PM
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Originally Posted by turabo87
Another candidate to blame could be the hazard light switch. These are notorious. Plenty of threads on how they relate to non-functioning brake lights.

No, the hazard switch can not cause only half of the brake lights to work. The brake light signal passes through the hazard switch as a single wire in and out which means it can only cause an ALL OR NOTHING failure.

Last edited by lionelhutz; Jun 5, 2019 at 10:51 PM.
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Old Jun 4, 2019 | 05:44 PM
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I agree. That’s what makes this so difficult to troubleshoot
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Old Jun 5, 2019 | 10:56 PM
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It's not terribly difficult. The turn signal switch part of the MFS takes the power wire in from the brake switch and the power wire in from the flasher. It switches those inputs to the correct output wires via a bunch of contacts, which gives the correct signal and brake light functions. The contacts for the signals on both sides and for the left rear brake lights are all OK. The contact for the right rear brake lights is bad.
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Old Jun 6, 2019 | 07:55 AM
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The signals comes from minfuse 8 through the stopswitch . You may have a problem along current loop 19 to the rear stop lamps .
Check the voltage at the B output of the multiturn signal level



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Old Jun 7, 2019 | 09:40 PM
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Thanks I’ll check it out and report back.
i changed out the hazard switch today with no affect, so the troubleshooting continues
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Old Jun 7, 2019 | 10:46 PM
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Are you surprised that it didn't help? I'm not, at all.

Messing with the wiring between the multi-function switch and the lights won't help either.

Last edited by lionelhutz; Jun 8, 2019 at 12:40 AM.
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Old Jun 9, 2019 | 08:02 PM
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Now that the $22 part has been ruled out as the culprit, we can now move on to the $175 part.
i hate electrical issues.
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Old Jun 9, 2019 | 10:28 PM
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Following the schematic rules out the hazard switch without spending any money....
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Old Jun 24, 2019 | 06:35 PM
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Update

Problem solved - it was the turn signal switch.
it took me 2 hours to replace. The part cost $210 from cheapestgmparts.com.

thanks to all for your guidance
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