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I did this document when I had that problem on my '89 200. The wiring may be the same. I believe the location of the Bulb Failure Sensor is in a differetnt spot but it's the same one.
No brake lights!!
OK, first let’s make sure you have power to your brake switch.
Pull down the carpet material that is up above your knees when you are sitting in the car. Just undo the top three clips, you don’t need to pull the whole thing down.
Follow the steering column toward the firewall until you see a switch just about where the brake pedal meets it. You should see two wires (green with red trace and blue with a red trace) going to a round ,brownish colored switch. With a 12 volt meter or 12v light connect one end to the chassis for ground and the other end touch the green/red wire. You should have 12 volts to this point, all the time.
If you don’t then this is your problem, you need to get 12 volts to this side of the switch.
IF YOU DO. You have 12volts to your switch. “Let’s check if the switch is working”. Continue on.
Keep the ground connection on your meter but connect the other side to the blue/red wire. Step on the brake pedal and your meter should read 12 volts or the light should go on if you are using that type of meter.
If you don’t then this is your problem, your brake switch is bad.
IF YOU DO; then the brake switch is good. Continue on.
Sit in the drivers seat, reach under the dash with you left hand, just above your knee. There is a round, Red Can (Bulb Failure Sensor) with about 12 wires going to it through a bumpy looking black connector. It is held in place by a spring clip, pull it toward the firewall. It will drop down with wires attached.
Look for the blue wire with the red trace (blue/red) going into the connector. It will be next to a yellow/silver and next to that a solid yellow wire. These two yellow wires run back to your brake lights.
Slightly separate the Red Can from the bumpy black connector so the metal pins from the ‘Can’ are starting to show. Again take your light or meter and have one end grounded and with the other end, touch the metallic pin that goes into the connector that is attached to the blue/red wire, step on the brake and you should have 12 volt (or the meter light will light depending on what type of meter you have). This test was to check to see if the blue/red wire was broken.
Now, between the connector and the Red Can (Bulb Failure Sensor) where you have the metal pins exposed a bit, with a paper clip or some other metal object, even a small screwdriver, touch ONLY the blue/red and the yellow/silver one next to it. With you making an electrical connection between the blue/red and the yellow/silver wire, step on the brake. You should see one brake light turn on (the left one I think). If a brake light works then your Bulb Failure Sensor is bad for the brake lights.
Now to fix this you can do two things; 1. Cut the two yellows and the blue from the connector and solder them together or
2. Mark the Red Can with a marker as to which pins are the blue/red trace, yellow and yellow /silver. Look at the bottom of the Red Can I think these pins are numbered “54S, 54L, 54R”. Then totally disconnect the Red Can, take it out of the car and solder a wire to these three pins. You must keep the wire very close to the body of the can so you can plug it back in for the other light sensing. And make very sure that you do not make any connection to the pins next to it.
After you have soldered the wire (should be about the thickness of a small paper clip) to the pins, install it back into the connector and with any luck…..the brakes will work again.
It’s easier then it sounds. When you start to look at it, things will make more sense.
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'75 Jeep CJ5 345Hp ChevyPwr and two motorcycles: it wasn't Volvos safety , it was Longevity that sold me
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