Where is the auxiliary battery located in the Mercedes-Benz C200L?
2 Answers
Mercedes-Benz C200L auxiliary battery is installed under the footwell on the passenger side. In this model, the auxiliary battery is replaced by a parking brake claw capacitor instead of a small battery. Some vehicle functions powered by it, such as windows, reversing radar, seat heating, etc., will also fail to work properly. Here is extended information: The role of the auxiliary battery: On one hand, it powers entertainment, lighting and other systems when the engine starts instantly, is not running or is running at low speed, such as automatic start-stop, dashboard display lights, music display screen, window lifting and other functions. On the other hand, when there are too many electrical devices in the vehicle and the power consumption is high, it assists the main battery in power supply.
After driving my Mercedes-Benz C200L for several years, I discovered that the auxiliary battery is hidden at the bottom right of the trunk. You can directly see it secured there by opening the trunk lid and lifting the floor cover or carpet. This small battery mainly supports the start-stop system, preventing stress from frequent engine restarts. During routine maintenance, I usually check whether the electrode connections are secure and if there are any signs of corrosion. If the auxiliary battery fails, the start-stop function may malfunction, and a warning light will appear on the dashboard. Replacement is straightforward, but it's recommended to operate after turning off the engine and wearing gloves to prevent static electricity. The location is cleverly designed to save space without affecting cargo capacity. Owners with good DIY skills can handle it themselves, but safety comes first—don't take it lightly.
