I have no brake lights and the fuse looks okay and the fuse for the brake light switch looks okay, too. What next?

How do you know the brake light switch is ok ? Did you check (with a voltmeter) battery voltage at the switch.

Inspection and Verification

1. Verify the customer concern.

1. Visually inspect the following for obvious signs of mechanical or electrical damage.
   
   Visual Inspection Chart Mechanical Electrical
   • Central junction box (CJB)
   • Brake pedal position (BPP) switch
   • Multifunction switch
   • CJB fuse 2 (20A)
   • Circuitry
   • Stoplamp bulbs

1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

1. If the concern is not visually evident, verify the symptom and refer to the Symptom Chart.

First check brake bulbs. If they are okay check fuses, the fuses are probably on a different circuit to your indicators. If the fuses are okay then next check that the brake light switch is functional, it is attached to the top mounting point if the brake pedal probably. The fault is almost certainly one of these, there is not much else to go wrong

try cheaking the light switch its self may be faulty not normally a relay for but it shold tell you on fuse box which relay runs light ign ect

make sure check brake light fuse first if brake light fuse okay.you replace brake light switch by removing trim panel below steering column.look under brake pedal area unplug electrical connector .remove the cotter pin and pull switch and power brake booster pushrod off the pin.then slide switch off power brake booster pushrod dont lose small nylon washer when installing new brake light switch.

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.

Running lights (left side): Fuse #47 -- Running lights (right side): Fuse #48 -- Brake lights: Fuse #54. Fuse panel is on the lower left side (underneath) the dashboard. NOTE: If it is your brake lights that are not working and fuse # 54 looks okay, check the brake light switch, it may have gone bad. Dome light is fuse #46 or #47 depending on model.

Try this possibilities to locate the fault. First get your voltmeter or 12v test lamp out. Check the 30 amp Brake (#2) maxi fuse in the under hood junction box.Fuse should have 12v at both sides at all times.
If okay proceed.
Go to the brake light switch. The orange wire should have 12v at all times. The white wire should have 12v when stepping on the brake.
If okay, proceed.
Next thing is the brake lamp relay in the underhood fuse box. Swap the relay with one that looks just like it and recheck the brake light operation. If the relay is no good replace it.
If the relay is swapped and still not working, see if you can feel the relay clicking when someone else steps on the brake pedal.

batt is power from the maxi fuse 12v all times
sls is the white wire from the brake switch 12v with brake applied.
gnd is body ground 0v all times
mfs goes to the multi function switch 12v with relay activated
the circuit is simple—power from the brake light switch white wires turns on the relay which then sends power back to the multifunction switch for distribution to the rear lights.
if you jump terminals batt and mfs the brake lights should come on.
If you have no power at terminal sls with the brake applied then you have a wiring fault white wire between the brake light switch and the relay
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there is a plastic plug that push the brake swith and they usually brake after many years , check that , and also check all the light bolbs

Check the brake light switch at the brake pedal, try and activate it by hand, if still no brake lights, would recommend replacing this switch. Hope this helps.

First thing I'd check would be the fuse for the stop lights. If it is okay the next thing I'd check would be the stoplight switch located under the dash where the brake pedal is suspended.