3rd Brake Light, S211, 2009

m80

MB Enthusiast
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Apr 26, 2015
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3,620
Location
Derbyshire, High Peak
Car
Viano, 651 2014. W211 646 (for a short while)
Hopefully I'm missing a simple answer.

It's not illuminating, the 2 side brake lights are.
When unplugged it brings up the '3rd Brake Light' alarm on the dash.
iCarsoft V2 doesn't show a fault on the brake light switch, just N/O and N/C when the pedal is pressed.

I haven't tried yet I'm expecting the LED to light if I apply 12v to the pins, based on the ECU seeing a fault when unplugged.

Thoughts appreciated.
 
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OP
m80

m80

MB Enthusiast
Joined
Apr 26, 2015
Messages
3,620
Location
Derbyshire, High Peak
Car
Viano, 651 2014. W211 646 (for a short while)
Turned out to be an unreliable connection at the plug.
I've bent the pins a little to hopefully make it more reliable,
I would close up the female pins in the plug but they're too small to manipulate.
 

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