Brake Lights Not Working

• REPLACEMENT

Fuse Block and Convenience Center

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See Figures 1 through 5
For 1988-93 models, refer to the wiring diagrams for fuse application and amperage ratings.
Fuses protect all the major electrical systems in the car. In case of an electrical overload, the fuse melts, breaking the circuit and stopping the flow of electricity.
The fuse block on most models covered by this section is located under the instrument panel to the left of the steering column. The fuse block should be visible from underneath the steering column, near the pedal bracket.

Fig. Fig. 1: Some models may use an underhood fuse/relay panel
If the panel is not visible, check for a removable compartment door or trim panel which may used on later models to hide the block. This panel is usually located on the left end of the instrument panel.
The convenience center is located just below the instrument panel on the drivers side. It contains individual relays such as the seat belt and ignition key alarm, and flasher.
On newer model vehicles there is an underhood fuse/relay center contains both mini and maxi fuses, as well as some relays.
If a fuse blows, the cause should be investigated and corrected before the installation of a new fuse. This, however, is easier to say than to do. Because each fuse protects a limited number of components, your job is narrowed down somewhat. Begin your investigation by looking for obvious fraying, loose connections, breaks in insulation, etc. Use the techniques outlined at the beginning of this section. Electrical problems are almost always a real headache to solve, but if you are patient and persistent, and approach the problem logically (that is, don't start replacing electrical components randomly), you will eventually find the solution.
Each fuse block uses miniature fuses (normally plug-in blade terminal-type for these vehicles) which are designed for increased circuit protection and greater reliability. The compact plug-in or blade terminal design allows for fingertip removal and replacement.
Although most fuses are interchangeable in size, the amperage values are not. Should you install a fuse with too high a value, damaging current could be allowed to destroy the component you were attempting to protect by using a fuse in the first place. The plug-in type fuses have a volt number molded on them and are color coded for easy identification. Be sure to only replace a fuse with the proper amperage rated substitute.

Fig. Fig. 2: Fuse panel cover-1991 model shown

Fig. Fig. 3: The fuse panel cover is located at the drivers side of the instrument panel. Remove the panel to access the fuses-1996-98 models shown

Fig. Fig. 4: Fuse application and amperage ratings-1994-98 models. Refer to the wiring diagrams for 1988-93 models

Fig. Fig. 5: Underhood fuse/relay panel applications and ratings
A blown fuse can easily be checked by visual inspection or by continuity checking.
A special heavy duty turn signal flasher is required to properly operate the turn signals when a trailer's lights are connected to the system.

REPLACEMENT

1. Locate the fuse for the circuit in question.

When replacing the fuse, DO NOT use one with a higher amperage rating.

1. Check the fuse by pulling it from the fuse block and observing the element. If it is broken, install a replacement fuse the same amperage rating. If the fuse blows again, check the circuit for a short to ground or faulty device in the circuit protected by the fuse.
2. Continuity can also be checked with the fuse installed in the fuse block with the use of a test light connected across the 2 test points on the end of the fuse. If the test light lights, replace the fuse. Check the circuit for a short to ground or faulty device in the circuit protected by the fuse.

Fuses

• REPLACEMENT
• REPLACEMENT

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REPLACEMENT

See Figures 1, 2, 3, 4, 5, 6 and 7

Fig. Fig. 1: The power distribution box in the engine compartment contains fuses and relays

Fig. Fig. 2: Remove the cover for the interior fuse panel

Fig. Fig. 3: A fuse puller tool is located inside the fuse panel to aid in the removal of the fuses

Fig. Fig. 4: Grasp the fuses with the puller and pull straight out to remove the fuses

Fig. Fig. 5: There are generally four types of fuses used in these vehicles

Fig. Fig. 6: Fuse current rating and color code chart

Fig. Fig. 7: Visual examination will reveal a blown fuse, but it should not be replaced until repairs are made
Fuses protect all the major electrical systems in the car. In case of an electrical overload, the fuse melts, breaking the circuit and stopping the flow of electricity.
If a fuse blows, the cause should be investigated and corrected before the installation of a new fuse. This, however, is easier to say than to do. Because each fuse protects a limited number of components, your job is narrowed down somewhat. Begin your investigation by looking for obvious fraying, loose connections, breaks in insulation, etc. Use the techniques outlined at the beginning of this section. Electrical problems are almost always a real headache to solve, but if you are patient and persistent, and approach the problem logically (that is, don't start replacing electrical components randomly), you will eventually find the solution.
Each fuse block uses miniature fuses (normally plug-in blade terminal-type for these vehicles) which are designed for increased circuit protection and greater reliability. The compact plug-in or blade terminal design allows for fingertip removal and replacement.
Although most fuses are interchangeable in size, the amperage values are not. Should you install a fuse with too high a value, damaging current could be allowed to destroy the component you were attempting to protect by using a fuse in the first place. The plug-in type fuses have a volt number molded on them and are color coded for easy identification. Be sure to only replace a fuse with the proper amperage rated substitute.
A blown fuse can easily be checked by visual inspection or by continuity checking.
The fuse block is located on the lower left side of the instrument panel. To access the fuse panel, open the driver's side door. Pull off the fuse panel cover to get to the fuses. Spare fuses and a fuse puller should always be kept here. Various convenience connectors, which snap-lock into the fuse block, add to the serviceability of this unit.

REPLACEMENT

1. Locate the fuse for the circuit in question.

When replacing the fuse, always use a replacement fuse of the same amperage value. NEVER use one with a higher amperage rating.

1. Check the fuse by pulling it from the fuse block and observing the element. If it is broken, install a replacement fuse the same amperage rating. If the fuse blows again, check the circuit for a short to ground or faulty device in the circuit protected by the fuse.
2. Continuity can also be checked with the fuse installed in the fuse block with the use of a test light connected across the 2 test points on the end of the fuse. If the test light lights, replace the fuse. Check the circuit for a short to ground or faulty device in the circuit protected by the fuse

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 okay 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 okay or burned. After the bulb has been removed inspect the filament and replace if failed. If the brake light bulbs are okay 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.

Try to adjust the dashboard dimmer switch.

or check for fuses:
CIRCUIT PROTECTION Fuses REPLACEMENT Fig. 1: The power distribution box in the engine compartment contains fuses and relays
Fig. 2: Remove the cover from the interior fuse panel (located on the far left of the instrument panel)
Fig. 3: A fuse puller tool is located inside the fuse panel to aid in the removal of the fuses
Fig. 4: Grasp the fuses with the puller and pull straight out to remove the fuses
Fig. 5: There are generally four types of fuses used in these vehicles
Fig. 6: Fuse current rating and color code chart
Fig. 7: Visual examination will reveal a blown fuse, but it should not be replaced until repairs are made
Fuses protect all the major electrical systems in the car. In case of an electrical overload, the fuse melts, breaking the circuit and stopping the flow of electricity. If a fuse blows, the cause should be investigated and corrected before the installation of a new fuse. This, however, is said than done. Because each fuse protects a limited number of components, your job is narrowed down somewhat. Begin your investigation by looking for obvious fraying, loose connections, breaks in insulation, etc. Use the techniques outlined at the beginning of this section. Electrical problems are almost always a real headache to solve, but if you are patient and persistent, and approach the problem logically (that is, don't start replacing electrical components randomly), you will eventually find the solution. Each fuse block uses miniature fuses (normally plug-in blade terminal-type for these vehicles) which are designed for increased circuit protection and greater reliability. The compact plug-in or blade terminal design allows for fingertip removal and replacement. Although most fuses are interchangeable in size, the amperage values are not. Should you install a fuse with too high a value, damaging current could be allowed to destroy the component you were attempting to protect by using a fuse in the first place. The plug-in type fuses have a volt number molded on them and are color coded for easy identification. Be sure to only replace a fuse with the proper amperage rated substitute. A blown fuse can easily be checked by visual inspection or by continuity checking. The fuse block is located on the lower left side of the instrument panel. To access the fuse panel, open the driver's side door. Pull off the fuse panel cover to get to the fuses. Spare fuses and a fuse puller should always be kept here. Various convenience connectors, which snap-lock into the fuse block, add to the serviceability of this unit.

1. Locate the fuse for the circuit in question. NOTE: When replacing the fuse, always use a replacement fuse of the same amperage value. NEVER use one with a higher amperage rating.
   
2. Check the fuse by pulling it from the fuse block and observing the element. If it is broken, install a replacement fuse the same amperage rating. If the fuse blows again, check the circuit for a short to ground or faulty device in the circuit protected by the fuse.
3. Continuity can also be checked with the fuse installed in the fuse block with the use of a test light connected across the 2 test points on the end of the fuse. If the test light lights, replace the fuse. Check the circuit for a short to ground or faulty device in the circuit protected by the fuse.

--- Or, try to look for burnt out bulbs in instrument panel.

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.