Upper brake light works fine, lower brake lights don't work at all,
with CHECK BRAKE LIGHTS warning every time you step on the brake:
In the trunk, remove the fuse access panel on the drivers side.
The fuses are on the left, and on the right is a black board with a
number of square, rectangular and flat (card?) switches that plug into
the board.
On my 2001 S60 T4, there are four flat card switches near the top; one
by itself, then a space, and then three in a row (see below):
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When I began pulling the bottom one out, the lower brake lights worked
and the warning went out. If I re-seated it completely the problem came
back, but if I wiggled it out just a bit the problem goes away.
We have a 2002 S80 that is doing exactly the same thing. I started wiggling the same flat relay switches yesterday and got all the brake lights working again. Briefly..Then we drove the car again, the lights went back off, and the code came back. This was a very helpful posting because I wiggled everything back there and with this information now know at least where to start. Thank you!
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You will need to check the fuse and then the brake light switch at the top on the brake pedal, you need a 12 volt test light to probe the connector while the brake pedal is held down to see if power is going in and out of brake light switch. These test lights are cheap and avail at any parts store like Kragen, Auto Zone etc.
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I had the same problem. The bulbs, fuse and break switch were OK. It turned out to be a cold solder on the burnt bulbs relay. For instructions and picture of how to get to the relay see this site:
http://www.brickboard.com/FAQ/700-900/In...
1991 740 brake lights don't work. Bulbs, fuse switch are good.Should replace the bulb outage relay be replaced?
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