C-Class (W204) 2008 - 2014: C180K, C200K, C230, C280, C300, C350, C200CDI, C220CDI, C320CDI

Rear light problem

Old Feb 26, 2025 | 08:08 AM
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Rear light problem

Does anybody know what could the problem be with my taillights and license plate lights staying on all the time even when the car is locked and light knob is turned into O postion
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Old Feb 26, 2025 | 09:02 AM
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Identifying your model and year is essential for us to help you.

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Old Feb 26, 2025 | 09:18 AM
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It is Mb C220cdi S204 2009 pre facelift with manual gearbox
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Old Feb 26, 2025 | 09:56 AM
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How long have you owned the car?
When did this problem start?
Do the lights stay on permanently or do they turn off after a while?
Have you scanned the car for any faults?

You have 15-16 year old car. The first place I would start after scanning for faults would be with the light switch, checking for any corrosion.

There are too many choices for a C220 CDI in XENTRY. Can you provide your complete VIN?
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Old Feb 26, 2025 | 09:59 AM
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I would also check the brake switch. It is locate under the dash and touching the brake pedal.
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Old Feb 26, 2025 | 10:11 AM
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There are too many steps and tests to post here. I would get XENTRY and reach out to @BenzNinja (he is a banner advertiser -- check the Mercedes Tech Talk forum).
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Old Feb 26, 2025 | 11:11 AM
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I have owned the car for little over year and the symptons started a week ago i do not believe in the brake switch because the additional brake light works but everything else is not working and the front lights respond well to the light switch.
i have not scanned the car for faults yet and the lights stay on until the car runs out of battery
and the VIN is WDD2042081F305260 if it is any help
i can only check the codes tomorrow
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Old Feb 26, 2025 | 11:53 AM
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OK, that makes sense about the brake light switch. Scanning for codes will be important. Make sure you are using a Mercedes-specific scanner. Generic OBD scanners are basically worthless when it comes to Mercedes. I will post some schematics.
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Old Feb 26, 2025 | 11:54 AM
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Old Feb 26, 2025 | 12:07 PM
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Here is the full schematic with legend.

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