Since I'm not an expert, I figured I'd search up "check your battery health." If everything seems fine, then disconnect and reconnect, and drive around for about three minutes. AI recommended the above, but you should also try the other things, the ones you can handle on your own. If you still need help, you can always wait for an expert to respond to your question. Just a personal recommendation: after setting it up and driving it, check the battery health. Just make sure the lights are still on, okay?
Regarding AI - tread carefully
Due to the loss of calibration data and communication memory by the vehicle's computer modules, numerous dashboard warning lights will remain illuminated in a Mercedes-Benz B-Class when the battery is fully disconnected or drained. Because the modules have already recorded "low voltage" fault codes that need to be cleared or reset, removing the battery again will not resolve the issue. numbers 1 through 3
Here are the steps to turn off the lights:
1. Adjust the steering wheel by resetting the angle sensors.
A common cause of the power steering, anti-lock brakes, and electronic stability program lights remaining on is when the steering angle sensor forgets where you were. Recalibration is a simple DIY project: [1, 2].
Get the engine going and keep it there in Park or Neutral.
Press the lock while fully angling the steering wheel to the left.
Once you reach the lock, turn the wheel to the right until it stops.
Turn off the engine, center the wheel, wait 30 seconds, and then start the car again. It is expected that the traction and steering lights will go out. [1]
2. Go for a Quick Drive in the Car
In order to readjust parameters such as tyre pressure and wheel speed sensors, modern Mercedes vehicles necessitate a short driving cycle. Maintain a safe driving pace for ten to fifteen minutes. The computer will automatically turn off many of the remaining yellow warning lights once it detects consistent data from all wheels and the engine reaches operating temperature. numbers 1 through 3
Step 3: Remove Stored Error Codes
The Check Engine and SRS (airbag) lights will not be able to self-clear if they are left on. After two months of sitting, the voltage drops so low that the car's memory stores "undervoltage" errors. numbers 1–4
An OBD-II diagnostic scanner, which you or a mechanic will have to plug into the port beneath the dashboard, is required.
Get some piece of mind by running a comprehensive health scan, recording the codes, and then selecting Clear/Erase Fault Memory. 1 and 2
4. Get the Battery Checked
After two months of total discharge, a car battery can develop sulfation, a condition in which it can maintain a surface charge but die under load. This damage is permanent and affects the battery's internal components. Even if your alternator is in good working order, the dashboard lights will keep coming on if your battery isn't able to keep a constant charge. A free battery and alternator load test is available at most local auto parts stores and garages. numbers 1 through 3
Also, keep in mind that a tiny Auxiliary Battery (usually found in the footwell or dashboard area) is standard on many B-Class models. If the primary battery died, the backup battery is probably dead too, and you'll keep seeing the "Battery Visit Workshop" message until you replace it. Are the lights red or yellow? That should help narrow it down [1, 2]. You can help me identify the system that is malfunctioning by telling me which warning lights are still lit, such as ABS, Engine, or Battery. [1]