Question about 2003 GMC Envoy

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Location of brake light activation switch

Brake lights and cyclops light do not work, replaced fuse and bulbs

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Check at base of steering column for switch

Posted on Nov 30, 2008

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1 brake light doesn't work... good bulb and fuse


Lights are usually on a dual circuit! Left and right have separate fuses, check all fuses or check the fuse diagram on fuse cover or manual to identify correct fuse!

Dec 28, 2014 | 2001 Dodge Intrepid

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Brake lights not working on my 1985 ford f150 after I replaced the brake switch


disconnect turn signal switch wires @ column, put power to wires to brake lights. that cks wiring to lights. next put power to wires through turn signal to ck switch. Power runs from brake light switch to turnsignal switch, to lights.

Oct 18, 2014 | 1985 Ford F150

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Brake lights won't work


It is either the switch at the pedal assembly or possibly the rear lighting module....without a wiring diagram in front of me...hard to say....but would go with the switch first due to ease of replacement and cost....then have the light module diagnosed if it does not solve the issue.

Scott, Porsche Master Tech 35 years

Jan 12, 2014 | 2006 GMC Envoy Denali

1 Answer

Hi there, my 1999 oldsmile cutlass supreme seems to be having difficulties w both brake lights. i replaced bulbs, no luck. cyclops light still works, suggestions? fuse? where would it be located, thanks...


try to toggle the hazard (emergency lamp switch on top of the steering collumn) on and off rapidly several times.the switch cuts the brake lights out for the 4ways to flash. if the 3rd brake-light still works the fuse is good.if the 4ways work and you cant get the brake lights to work then the multifunction lever has to be replaced which has the hazard switch on it. this is a vary common problem but the steering wheel has to be removed along with some other components behind the wheel which require special tools and knowledge. usually you can get the brake-lights working again by working the button for the 4ways rapidly until the brake lights start working again. good luck.

Sep 23, 2010 | 1999 Oldsmobile Cutlass

1 Answer

2003 Silhoutte, both lower brakes lights do not work. Bulbs or turn signal switch? Turn signals work okay. Cyclops works okay, fuses look good.


Bulbs are bad, most bulbs burn out around the same time withing a day or two and both of your brake lights may have gone bad. Try with the simple and inspect the bulb and replace if you see any discoloration to the glass on the bulb. Good luck and than you for using Fixya.

Mar 06, 2010 | 2003 Oldsmobile Silhouette

1 Answer

Rear side brake lights won't work after fuses/bulbs replacement


If the high level brake lamp works and the other 2 lamps have good bulbs, then there is a power loss, most propably with the installation. You should go to an auto electrician to see where the break is.
If someone has recently done any work on the electrics, you should recheck. It is not a seperate fusable power supply system or brake switch for the high level brake lamp, it will take its power from the fused system that the other 2 have.
Hope this helps

Oct 04, 2009 | 1998 Land Rover Discovery

1 Answer

No Brake lights-- Bulbs & Fuses ok, also no cyclops at all


Hi my name is mike ! make sure with a test light that you have 0 power to the light back ther ,and if not then take a test light and check down by the brake pedal at the wires that go to the brake light switch ,check all of the wires for power and there may be more than one that has power to it ,do this without hitting the brake ,remember which wire or wires had power to them ,then hold the brake and one of the wires that didnt have power before holding the brake ,should have power to it now because when you hold the brake on it should close the brake light switch and send power to the lights ,if you dont have power coming through that switch when holding the brake pedal down ,then replace the switch .

Jul 28, 2009 | 2000 Dodge Grand Caravan

3 Answers

Brake lights do not work All bulbs have been replaced.


Troubleshooting Procedures - Read Completely Before Beginning
(American Car) All Brake Lights Not Working
  • Check System Fuse: A fuse is used to protect the brake light circuit from amperage overload. If the fuse has failed it will not allow the electrical current to continue to the brake lights. To check the fuse, first locate the brake light system fuse in the fuse panel which is either under the dash or under the hood in the power distribution center. Connect the test light to a ground like an engine or dash bracket and turn the ignition key to the "on" position. Using the test light probe both sides of the fuse. If the test light illuminates on both sides the fuse is ok continue onto the next step. If one side of the fuse illuminates the fuse has failed and needs to be replaced. If the fuse fails as soon as it is replaced or when you apply the brake pedal the brake light electrical circuit is shorted to ground. Rarely a system short can occur, a car repair manual is needed to find the wiring schematic for the brake light circuit. Once the brake light wiring has been located inspect and repair as needed.
  • Check Brake Light Bulbs: All cars have three brake light bulbs that create the brake light illumination affect. If all of these brake light bulbs fail no brake light operation will occur. I know what you're thinking, you might say all three brake lights at once? But in reality one brake light went out at a time and you did not notice. People only tend to notice something when they almost run into the back of your car to help persuade them to inform you the brake lights aren't working. Remove any of the brake light bulbs to confirm the bulb is ok or burned. After the bulb has been removed inspect the filament and replace if failed. If the brake light bulbs are ok continue to the next step.
  • Checking the Brake Light Switch: A control switch is used to connect the brake light electrical circuit. This switch is located near the brake pedal lever. Basic switches have just two wires, power in and power out to the turn signal switch. Use a test light that is grounded and with the key in the "on" position test for power at one side (wire) of the switch, then press the brake pedal while testing the opposite side (wire). It should illuminate the test light, if electrical power is connected through the switch go to the next step. If no power is detected through the switch the brake light switch has failed and replacement is required. If your car is equipped with more than two wires integrated into the brake light switch a car repair manual is needed to locate the proper brake light circuit wiring.

Jul 07, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Brake lights work intermittently


It sounds like a wiring fault - an earthing problem. Have a look around the lights/inside the lights themselves.. rear and front lights, brake lights, etc ...check the wires for corrosion/splitting. In particular check any black earth leads where they attach to an earthing point.

Mar 26, 2017 | 1997 Chevrolet Lumina

1 Answer

Stop lamp and cyclops light


If by the "cyclops light" you mean the third brake light, I went to auto zone and purchased 6 ea. part number 858352 instrument panel connectors and added number 194 bulbs to them. All you have to do is pull (gently) on the cover and it will come off. It snaps in place. Twist the bulbs 1/4 turn ccw to remove, insert new assembly and voila, you're in business. The other brake lights are behind the carpet in the trunk. Be sure to remove the correct bulb or you will replace the turn/marker lamp and still have a brake light out. Good Luck.

May 15, 2008 | 2000 Saturn Ls 4dr Sedan

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