Difficulty
Easy
Steps
8
Time Required
00:30:00
Ce tutoriel a été créé par la communauté
User contributed
Introduction
Battery replacement on Mercedes type 203: W203, CL203, S203, Saloon, Estate, Coupe.
-
-
Pull the red lever located under the steering wheel. The hood will lift slightly.
-
Pull the black lever located at the front of the hood to open it completely.
-
-
-
Locate the cabin filter holder.
-
Unclip the three tabs that hold the filter holder in place.
-
Tilt the filter holder down and up to remove.
-
-
-
Using a 10 mm flat wrench, remove the Negative terminal (black cable, terminal marked with a “-” on the battery).
-
Caution: Always remove the negative terminal first to avoid a short circuit with the body ground.
-
-
-
Using a 10 mm flat wrench, remove the Positive terminal (red cable, terminal marked with a “+” on the battery).
-
Pass the emery cloth inside the Positive and Negative terminals to remove traces of oxidation.
-
-
-
Using a 13 socket and a ratchet-mounted extension, remove the two bolts from the retaining bracket. They are located at the base of the battery on the right side (positive terminal side).
-
Take out the battery. Please note that the battery weighs several kilos, it is recommended that two people do this.
-
Install the new battery, the terminals will be facing the front of the vehicle.
-
Screw back the tab that holds the battery
-
-
-
Opposite of the direction of disassembly, reassemble the Positive terminal first: red cable on the terminal marked “+” and tighten with the 10 key. -
Reassemble the Negative terminal, black cable on the terminal marked “-” and tighten with the 10 key.
-
-
-
Fit the filter holder and replace the retaining tabs.
-
-
-
This step is not mandatory but it is strongly recommended especially if you are replacing your battery following a starting fault. It will allow you to check the correct operation of the charging circuit (Alternator).
-
Start the engine.
-
Using a multimeter set to DC Voltage measurement (refer to the multimeter manual), measure the voltage at the control terminals. The voltage should be between 13.5V and 15V.
-
Close the hood and the operation is complete.
-
Cancel: I did not complete this guide.
5 other people completed this guide.
5 Comments
Hello, maybe it is useful to specify to put the engine hood vertically by unlocking the left jack (when you are in front of the vehicle) of it. Just push the red button of the jack by raising the hood vertically. This facilitates access to the battery to lift it. For info on a clk convertible it weighs 22 kg, it can help to be just above and not at an angle, behind and at arm's length!!!
Hello. Thank you for this magic red button that made my task easier!
tp8900 -
Good morning,
It is true that in the Mercedes workshop, a resting power supply is connected when changing the battery.
However, when it comes to radio, the data is stored in an EEPROM which does not lose information when it is no longer powered.
As for the data from the various calculators in the vehicle, they are also stored in this form. The risk of loss of information can occur if the power supply is disconnected while the calculators are in use. It is therefore necessary to switch off the ignition before changing the battery.
Regarding the sunroof, there is a procedure to calibrate it, by opening and closing the roof completely. See on the internet for the detailed procedure.
For information,
It seems to me that there is a risk of losing the programming of the windows and sunroof or even the radio if all power is removed from the vehicle.
Clear and simple to produce, the photos are a real plus
