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Based on my reading of the W124 schematics, the same would hold true for any of the lights monitored by the "Exterior Lamp Failure Monitoring Unit." If the switch that turns on the lamp fails or if its fuse dies, the lamp won't work and the monitoring circuit won't have a clue.
So much for "fail safe." This is a good lesson for all of us. Monitoring circuit or not, we need to look at the lights every once in a while to confirm that they are working.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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