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The ebrake should have no effect on the Bulb Failure Sensor, but if the painter had the tail light units off, you may have a flakey connection somewhere. Here are the basics of the BFS operation —
The BFSensor tests for equal current on each side of these three pairs of lights (includes 3 bulb brake lights):
• Tail lights
• Brake lights
• Low headlight beams
You can isolate the source of the BFS warning light to one of these groups as follows. With the car running:
1 – Step on Brakes.... If no Warning light,
2 – Turn Parking (tail) lights on.... If still no Warning light,
3 – Turn on Low beams. Should be the cause of the Warning light.
If Warning light is ON when all these lights are OFF (or all test OK), it could be the BFSensor at fault. But more often it is simply due to a "mismatch" (bulb brand, age, or socket condition), or corrosion at the grounding wires for Left & Right light housings.
You don't always need to replace both bulbs in a pair (in fact seldom, in my experience).
Note that there will be NO warning light if BOTH bulbs in a pair are out.
--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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