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This is getting way too complex. 200 1992

uid 18083's pic
posted by  lucid on  Sat Nov 24 07:13 CST 2007
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

When the brake pedal is pressed, the brake switch should close and deliver +12 volts to pin 9 (54S) on the Bulb Failure Sensor plug. It's the only Blue/Red wire there. Check with your voltmeter or a 12V test light.
(The ignition does NOT have to be on)

No voltage at the Blue/Red wire? Problem is "upstream" toward the pedal switch or fuse.

Voltage at Blue/Red wire OK? Suspect the Bulb Failure Sensor.
Test any or all 3 BFS outputs to brake lights for voltage. If the BFS is bad, the output voltage will be missing:
• High Brake light, BFS pin 5 (S) Blue/Black wire
• Left Brake light, BFS pin 10 (54L) Yellow/Gray wire
• Right Brake ligts, BFS pin 11 (54R) Yellow wire

--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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