Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.
Turn engine off and remove the key. Disconnect both battery cables (positive and negative) and clamp or use a jumper wire to hold them together, turn key to on position and let it sit for 10 minutes. Then reconnect one at a time, positive first then negative. This should reset the system.
There is a service bulletin out for this problem and it does involve replacing the electron ignition switch, this would need to be towed to the dealer for repair as they will need to reprogram with the scan tool.
I am unable to get cost info at this time as our dealer parts department is closed, you can call the parts department at the dealer and ask for a parts price. The labor should not be more than a couple hours to replace.
Please reply to this if you need more help and we can continue this conversation at no extra charge. This does not have to be my only answer. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. Hoping to be giving you 5 star service.
You want to ground the positive cable, this can be done by holding the two cables together. There are capacitors in vehicles that store power even when the battery is disconnected. By grounding you are discharging the capacitors which clears the memory from various modules.
Yes, it is a common problem. The battery reset is always worth a try because it does not cost anything.
Key out. Dealer only as the keys need to be programmed.
No this will not reset the key codes to start the car, only replacing the EIS will cause this and need the key codes programmed
Yes positive side first.