This is a photo of the Bulb Failure
Warning System from my car.
The top photo is the bottom view of this sensor.
Press here to see Location of the
sensor in the central electrical unit.
Click on <----Back to return
This photo shows how the unit works.
The top section shows the double wound
coil on the left.
The reed switch is shown on the right.
The reed switch is located inside the coil.