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111/123/124/126/140/201
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925 Posts
Discussion Starter #1
Hi,
The light blub warning light was on today and I was expected that maybe one of the blub was burnt out. However, every bulb work just fine. I restart the engine and I notice that when I hit the brake, both the tail brake light and works and the light blub indicator was on again.

Then I realize a few things
1) When hit the brake, the parking sensor indicator was dimmed (just like when turn on the headlight)
2) WHen hit the brake without turning the head light, all the brake lights on even for the one which stay on when turn on the parking light
3) when turn on the headlight, all the brake light on, even the third brake light
4) when turn on the headlight and hit the brake, the light will be a little brighter....just a little.

Does anyone has similar issue before? How can I fix it or check it?
 

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94 s420 98 s420
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537 Posts
I had this indicator come on, I checked all the bulbs and they seemed fine. My problem was the rear windshield brake lamp, which I over looked when checking the bulbs.
 

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111/123/124/126/140/201
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925 Posts
Discussion Starter #4
All the lights work included the third brake light (the rear windsheild one)

Anyway the problem gone today when i turn the headlight on and off..... so weird....
 

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1990 500SL
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146 Posts
I'm having a very similar problem with my SL... i cant figure it out at all. seems to happen when its cold out.
 

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Registered
111/123/124/126/140/201
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925 Posts
Discussion Starter #6
That's what i suspect too....
guess the humid weather make the lights play funny...
 
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