Question about Chevrolet Monte Carlo
The sensor is most likely the culprit. It is photosensitive - and prone to failure if parked outside in the sun alot. (the sensor is called a Surveillance Mode Switch)
If it were a Fuse or Relay - the lamps would not light at all - they share the same power source... 7.5A PANEL DIMMING fuse.
My schematic shows your dimming is actually controlled by the BCM (Body Control Module) with the supplied signal from the Light Sensor.
If the Light sensor is OK - your BCM has developed a problem, and is not serviceable - it must be replaced.
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Posted on Jul 03, 2009
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Posted on Jan 02, 2017
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