The "Check Circuit" is... (archive)

My '87 535is has the overhead "brake light" warning on although all the lights at the rear are operating perfectly. I have replaced the rear (all) bulbs with the silver based ones (no copper based) as well as replaced the main gaskets which were in poor shape. I've checked to see if there has been any water leak and there is not. Humidity is not a factor here in "sunny" Los Angeles.
When I start the car the all familiar "check" light is flashing on the dash and after pushing "check" above the brake light remains on. Once I've pressed the overhead check button the dash "check" does not flash until the next time I've started the car.
The car had some rear end damage at some point in it's life but all the repairs were done extremely well.
This just in-I've discovered the reverse lights do not work although the bulbs are fine.
Any ideas of a direction to go in to get the dang "check" light to stop flashing at me everytime I start the car? (as well as getting the reverse lights to work!) Thanks as always to a superior board with many E28 enthusiasts smarter than me (not hard to do!).

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mounted behing the rear license plate if memory serves. A poor connection at that connector or a sticking relay in the module will keep the warning on even if the lights work.

Clean the harness and give the module a shot while the brakes lights are on and see if it starts working.

Look in the Bentley-it's in there.

Mine did!

Bob

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