W203 Brake lights always on
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Joined: Feb 2020
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w203/w639/w639/w210/w208/w202
W203 Brake lights always on
Hey there MB fans,
Car: C class, w203, 2.2 diesel, year 2001, estate.
One morning I started the car and brake lights (including the upper brake light) keep staying on. I did change brake light switch, twice. So I have 3 of them now. When switch is pressed, nothing happens. When I unplug the brake light switch, lamps do go off. Star does not give me a fault of any kind in regard to brake lights. Bulbs were not changed, I do own it less the 6 months only though, but everything worked before this.
In addition while I was looking at all relays and fuses front wipers stopped working, who knows maybe there is a connection.
When I take out a bulb(brake light) and start the car, display shows a fault.
I managed to find that the wiring schematics is depicted in PE82.10-P-2002-FA document, failed to find it anywhere, not an advanced Star user.
While trying to solve this, solved ESP fault, the steering wheel sensor needed calibration, but this fault was present since I bought the vehicle.
If anyone has any suggestion on the matter or clarifying questions, any help will be greatly appreciated!
Very Truly Yours,
Nick
Car: C class, w203, 2.2 diesel, year 2001, estate.
One morning I started the car and brake lights (including the upper brake light) keep staying on. I did change brake light switch, twice. So I have 3 of them now. When switch is pressed, nothing happens. When I unplug the brake light switch, lamps do go off. Star does not give me a fault of any kind in regard to brake lights. Bulbs were not changed, I do own it less the 6 months only though, but everything worked before this.
In addition while I was looking at all relays and fuses front wipers stopped working, who knows maybe there is a connection.
When I take out a bulb(brake light) and start the car, display shows a fault.
I managed to find that the wiring schematics is depicted in PE82.10-P-2002-FA document, failed to find it anywhere, not an advanced Star user.
While trying to solve this, solved ESP fault, the steering wheel sensor needed calibration, but this fault was present since I bought the vehicle.
If anyone has any suggestion on the matter or clarifying questions, any help will be greatly appreciated!
Very Truly Yours,
Nick
MBWorld Fanatic!
Joined: Dec 2003
Posts: 3,275
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From: BC, Canada
2003 C230K Coupe Orion Blue
I would look into the wire ends (ie connectors) in the switch, as well as the other ends of the wires. Maybe something is loose. Also you may want to electrically test the switches to see how they work.
If all wires and the switch are okay, then unfortunately it'll be a SAM issue. Those can be picked up (used) online.
If all wires and the switch are okay, then unfortunately it'll be a SAM issue. Those can be picked up (used) online.
Thread Starter
Newbie
Joined: Feb 2020
Posts: 3
Likes: 0
w203/w639/w639/w210/w208/w202
This probably is a wire/relay issue since I just tried to pull out the front SAM, failed, put it back in, everything works. But it will fail again in some time, so any diagramm of which wire goes where and which relay plays with me will definetly help!
