Why does my Mercedes not start when I turn the key?
Despite this brand’s high quality, though, Mercedes’ can develop problems with or without regular car maintenance. There are a few theories about why your Mercedes refuses to start when you switch the key in the ignition. It is infuriating to slide behind the wheel, turn the key, see dash lights blink, but the engine won’t turn over.
Why does the key not turn when inserted in the ignition?
The EIS module could also be the reason that the key does not turn when inserted in the ignition. Many car owners complain that the car starts fine on a warm or hot day but in cold days the car will not start. This may sound strange, but it is reported frequently.
What to do if your car key won’t turn?
If you can’t even turn your car’s key to the “start” position, you can be certain that the problem is either the electrical system or the key itself. If you have backup ignition keys, give them a try. You’ll have to get a dealer to help you with a key that isn’t recognized by the EIS.
How to diagnose no start, turn key and nothing happens?
Spark (Only gas engines need a spark, diesel engines need high compression and glow plugs in cold weather to start) Compression (without compression the engine will not run, or not have any power) To read my article where I really lay out the FastC method of diagnosing any no start condition read here.
The EIS module could also be the reason that the key does not turn when inserted in the ignition. Many car owners complain that the car starts fine on a warm or hot day but in cold days the car will not start. This may sound strange, but it is reported frequently.
What to do if your Mercedes key won’t turn?
If you have this problem you will have to install a new / virgin EIS. You can not install a used unit because the EIS has to be paired / married to the car using Mercedes-Benz Star Diagnostic Software. They key itself may be the reason why the car doesn’t start. The key may open the doors, but it will not start the car.
Why does my Mercedes Benz make a clicking noise?
It requires electrical power to crank the engine. The car makes a clicking noise but won’t start. Hint: Starter Problem or Low Battery This may seem obvious, but an old battery is the root of many headaches and can cause all sorts of malfunctions on Mercedes-Benz cars.
How does a smart key work on an ignition switch?
As you insert the Smart Key remote into the Electronic Ignition Switch (EIS) control module (N73), power is supplied to the key by the induction coil ring located in the EIS. Data is then exchanged with the infrared transmitter to validate the Drive Authorization.
Why does my Mercedes Benz engine not start?
However, when i turn the key all the way, the engine does not even try to crank. It almost feels as if only the starter is disconnected or something from the car entirely. (I know nothing about car engines)
What should I do if my Mercedes battery won’t start?
To determine whether or not your problem is with the battery — without going to the expense of buying a brand new one — use another car to jump start your Mercedes. If this is successful in getting the engine to start, you’ll know your issue is with the battery.
Why does my 2010 GLK 350 not start?
My 2010 GLK 350 won’t start. Power windows, mirrors, and turn signals don’t work, but power locks and radio do. I checked every fuse that made the least bit of sense. The steering wheel won’t unlock and the car won’t come out of park, so getting on a tow truck will be interesting.
What should I do if my Mercedes Benz won’t start?
Start the car and you should be able to get around 60 psi. When the engine is running and when you turn off the engine the pressure should stay steady. Always perform this test on a cold engine. Next, make sure that the fuel injector connections are secure and not loose. Check the fuel pump and the fuel pump relay.
Why does my Mercedes Benz refuse to start?
There are a few theories about why your Mercedes refuses to start when you switch the key in the ignition. It is infuriating to slide behind the wheel, turn the key, see dash lights blink, but the engine won’t turn over. When you least expect it, running late on your way to a special event, you try turning the key again.
Where is the ECO start stop button on a Mercedes C class?
If you wish to switch off the Mercedes C-Class ECO start stop system, locate the button with the start stop symbol or ‘ECO’ button. Depending on your model of C-Class, the button is located wither on the centre console or the dashboard. The ECO start stop system can only be turned off for the engine start / key cycle only and not permanently.
Despite this brand’s high quality, though, Mercedes’ can develop problems with or without regular car maintenance. There are a few theories about why your Mercedes refuses to start when you switch the key in the ignition. It is infuriating to slide behind the wheel, turn the key, see dash lights blink, but the engine won’t turn over.
Why does my push start on my Mercedes not work?
As the battery in the key start gets old, it will unlock/lock the doors but it will not have enough power to send a signal to the car for the Engine Start function. If your Mercedes push start does not work change the batteries in your key fob first.
To determine whether or not your problem is with the battery — without going to the expense of buying a brand new one — use another car to jump start your Mercedes. If this is successful in getting the engine to start, you’ll know your issue is with the battery.
Why is the start / stop button not working?
One of the most common problems that prevent the Start/Stop button to work is a weak battery in the key fob. As the battery in the key start gets old, it will unlock/lock the doors but it will not have enough power to send a signal to the car for the Engine Start function.
How does a key turn work on a starter motor?
The key turn completes a small circuit that tells the battery to release power to the starter solenoid. The solenoid ramps up the power given to it and that power causes the starter motor to turn very quickly.
What kind of key does a Mercedes Benz use?
While most Mercedes-Benz cars have the SmartKey some models such as the ML Class, SLK Class, Crossfire used a metal blade key up to 2005. Some models suffer from the defective key tumbler. We have seen cars with as little as 20,000 miles where the tumbler go bad. Make sure the steering wheel is not in a locked position as mentioned above.
What to do if your Mercedes key dies?
If you have a Mercedes-Benz with KEYLESS-GO, you may be wondering how to start the car if the battery in the key dies. Pressing the Engine Start/Stop button does nothing of course if your key fob battery has died. Mercedes key battery has died, and you can’t start your car using the START ENGINE push button.
What’s the start / stop button on a Mercedes?
These instructions work for all Mercedes-Benz models that have the Start/Stop button including S-Class, C-Class, GLE-Class, ML-Class, E-Class, GL-Class, SL-Class, SLK-Class. To get inside the car, remove the metal key from your Mercedes key fob.
Why is my Mercedes C class key not working?
The main symptoms are the key won’t unlock the doors or start the car. You may see a blinking red light when you press a button. Insert the key and turn it to the “ON” position, then press and release the lock button on the key. Press and hold the remote’s unlock button.
Why is my key fob not working on my Mercedes?
If neither of your key fobs unlocks or starts the car, there’s a good chance that the issue is the car’s battery. Some owners report that their cars failed to start even after a jump start, but a later trip to the dealership indicated a dead car battery.
These instructions work for all Mercedes-Benz models that have the Start/Stop button including S-Class, C-Class, GLE-Class, ML-Class, E-Class, GL-Class, SL-Class, SLK-Class. To get inside the car, remove the metal key from your Mercedes key fob.
If you have a Mercedes-Benz with KEYLESS-GO, you may be wondering how to start the car if the battery in the key dies. Pressing the Engine Start/Stop button does nothing of course if your key fob battery has died. Mercedes key battery has died, and you can’t start your car using the START ENGINE push button.
How do you change the transmitter key on a Mercedes Benz?
1. Place transmitter key in ignition lock and turn to position 2 2. Extract transmitter key from ignition lock 3. Within 10 seconds: battery in the transmitter key has been replaced. Yeh but he looks like he’s in United Arab Emirates!
What are the symptoms of a failed Mercedes-Benz ignition switch?
Possible symptoms of a failed Mercedes-Benz include: Key may turn, but the instrument cluster lights don’t turn on Mercedes-Benz ignition switch (often referred as immobilizer module) can become faulty and in some cases due to user error. For example, some common reasons why the ignition module failed are:
How does the ignition work on a Mercedes Benz?
How ignitions work is straightforward. Turn the key in the ignition lock cylinder. The ignition switch triggers, and your car or SUV gets going. What happens under the hood, though, is the starter motor, starter solenoid, ignition coil, and battery work together to send electricity to the engine cylinder head.
Why is my Mercedes EZs EIS ignition not working?
The only issue here is that if you can’t turn on the ignition, you can’t power on the OBD2 port and the iCarsoft MB II scanner. If the ignition turns on intermittently, consider yourself lucky and scan for codes. Hopefully, there are fault codes that will point you to the problem. Diagnosing Mercedes ignition problems isn’t a simple DIY job.
Where do the spark plugs go in a Mercedes?
Turn the key in the ignition lock cylinder. The ignition switch triggers, and your car or SUV gets going. What happens under the hood, though, is the starter motor, starter solenoid, ignition coil, and battery work together to send electricity to the engine cylinder head. That’s where the spark plugs are.
How do you change the ignition lock on a Mercedes 190E?
Use a 10mm Hex and breaker bar to remove the screw holding the wheel to the shaft (red arrow).Have someone hold the wheel while you break the screw loose, never use the steering lock to hold the wheel in place. In this photo you can see the airbag plug (green arrow) and horn connections (yellow arrows).
Why is my ignition not working on my Mercedes Benz?
It is possible that the battery in the car is defective, as it does not provide the necessary voltage for the ECU and the N73 Electronic Ignition/Starter Switch (EIS) to function properly. If the battery is dead or has low voltage / under voltage, the CAN communication between EIS and N72 may not function properly.
What to do if your Mercedes ignition switch fails?
Once the switch fails, you won’t be able to start your vehicle. Because newer Mercedes models also use laser-cut transponder keys, you may need to have your ignition key re-cut or reprogrammed depending on the model of Mercedes you have. The first step, of course, is to remove the old ignition switch.
How do you change the ignition key on a Mercedes?
Because newer Mercedes models also use laser-cut transponder keys, you may need to have your ignition key re-cut or reprogrammed depending on the model of Mercedes you have. The first step, of course, is to remove the old ignition switch. Adjust the Mercedes telescoping steering wheel to the maximum extended position (maximum out position).
Use a 10mm Hex and breaker bar to remove the screw holding the wheel to the shaft (red arrow).Have someone hold the wheel while you break the screw loose, never use the steering lock to hold the wheel in place. In this photo you can see the airbag plug (green arrow) and horn connections (yellow arrows).
What to do if the key does not turn in the ignition?
If the key does not turn in the ignition, try moving the steering wheel as you try to turn the key. The steering wheel will feel completely solid if you try to move it in one direction and may move slightly in the opposite direction.
Why is my Mercedes-Benz E320 key not turning?
Why Won’t My Key Turn? What are common reasons my Mercedes-Benz E320 key won’t turn? While there are a variety of reasons your Mercedes-Benz E320 key won’t turn, the most common 3 are a binding steering column/lock, an ignition switch issue, or a problem with the ignition key.
If the key does not turn in the ignition, try moving the steering wheel as you try to turn the key. The steering wheel will feel completely solid if you try to move it in one direction and may move slightly in the opposite direction.
It is possible that the battery in the car is defective, as it does not provide the necessary voltage for the ECU and the N73 Electronic Ignition/Starter Switch (EIS) to function properly. If the battery is dead or has low voltage / under voltage, the CAN communication between EIS and N72 may not function properly.
While most Mercedes-Benz cars have the SmartKey some models such as the ML Class, SLK Class, Crossfire used a metal blade key up to 2005. Some models suffer from the defective key tumbler. We have seen cars with as little as 20,000 miles where the tumbler go bad. Make sure the steering wheel is not in a locked position as mentioned above.
Where do I Reset my key on my Mercedes?
Instructions for resetting your Mercedes-Benz key are located in your owner’s manual, as explained by a Florida Mercedes-Benz dealership. If your key still does not reset after attempting this process, call your Mercedes-Benz dealership for additional assistance. Tiffany Raiford has several years of experience writing freelance.
What does the fob remote on a Mercedes Benz do?
The newer keys have a transponder integrated in them. The key fob remote serves two purposes. First it disables the anti-theft system when you unlock the car. Second, Drive Authorization System verifies the key to make sure it is the right key to start the car.
What are the common problems with Mercedes key fobs?
Common Mercedes Key Fob Problems Go to top 1 Mercedes key fob not working after battery change 2 Mercedes remote doesn’t work anymore 3 Keyless remote doesn’t lock/unlock the car 4 Mercedes key fob won’t unlock doors 5 Panic button doesn’t work 6 Trunk unlock doesn’t work
How do I Sync my Mercedes fob to my car?
To synchronize a Mercedes-Benz key to your car all you need to do is insert the key into the ignition for a few seconds. This works in most cases but every now and then you may need to follow further instructions to synchronize your Mercedes key fob remote with your car.
What does it mean when your ignition key won’t turn?
The key (electronic key); 2. The electronic ignition switch (eis, the place where you put your key in); 3. steering locker; 4 the central electronic circuit module. If only one of them has a problem, the key will refuse to turn.
What to do when your car key won’t turn?
DAS was introduced back in 1996 and has had several security improvements. The main DAS versions DAS are DAS 2, 2A, X, 3. New drivers always experience this at least once, so we thought we would include it in this list. If the key does not turn in the ignition, try moving the steering wheel as you try to turn the key.
What to do if your ignition key is not recognized by EIS?
If you have backup ignition keys, give them a try. You’ll have to get a dealer to help you with a key that isn’t recognized by the EIS. If your keys have an infrared connection (check your owner’s manual) you may be able to fix the problem yourself. Check your owner’s manual.
What happens if you don’t turn the ignition key?
Sometimes the ignition key won’t turn or rotate. If that happens the vehicle won’t start, the steering wheel won’t turn and it won’t shift into gear. On a late 90’s or early 2000 GM vehicle this is the way to get it apart so you can replace the tumbler.
Why does my steering wheel not turn when I turn the key?
Turn the Steering Wheel The most common reason that a car key will not turn is that the steering wheel has locked. This will happen when the steering wheel has been moved after the key has been removed from the ignition cylinder. Turn the steering wheel to the right and left.
Where is the ignition key on a Mercedes Benz?
There are 4 electronic and/or mechanical modules that are synchronized for everything to work ok: 1. The key (electronic key); 2. The electronic ignition switch (eis, the place where you put your key in); 3. steering locker; 4 the central electronic circuit module.
What causes a Mercedes Benz key to not turn?
List of common problems and possible solutions 1 Locked Steering Wheel. New drivers always experience this at least once, so we thought we would include it in this list. 2 Discharged Battery Undervoltage. 3 Key Tumbler Defective. 4 Defective Electronic Ignition/Switch System EIS / N73. 5 Smart Key Remote.
What causes a Mercedes Benz ignition to not turn?
Mercedes EZS EIS Ignition Switch Problem, Cause, Solution. A problem that Mercedes-Benz owners may face is the key no longer turns in the ignition. This issue is often caused either by a defective key, bad shifter module, a failed Electronic Ignition Switch (EIS) also known as the EIS-EZS or a bad steering lock module (ESL).
What should I do if my Mercedes key fob is not working?
If you need a replacement battery note that Mercedes-Benz uses CR2025 battery type. Ensure you have new batteries in your key fob. Next, look carefully at your Mercedes-Benz key. When you press the button on your key you should see a small RED led light. The light should light up every time you press any of the buttons (Lock, Unlock, Panic, Trunk).
Can a Mercedes Benz start fine in the morning?
Even if your Mercedes-Benz may be starting fine in the morning, different systems and control units in your car could start to malfunction due to the age of the battery. You could get errors that at first don’t seem to relate to the battery.
Do you know how to jump start a Mercedes Benz?
So many owners report electrical problems once they jump start their Mercedes-Benz. You should know how to jump start your Mercedes-Benz following the procedures recommended by the manufacturer. If you ever have to jump start your Mercedes-Benz in the future, keep those jumper cables or jump box connected for at least 10 minutes or more.
How do you sync the remote on a Mercedes?
Instructions on how to sync Mercedes remote: Insert the key into the ignition. Quickly remove key from ignition and within 10 seconds hold down the lock button. Continue holding the lock button, and at the same time press, the unlock button five times. Next release all buttons and press the gate/trunk button one time.
What happens when you turn off the ignition key?
When you switch off the ignition key, the ignition relay should also shut off power to all engine components; otherwise, it will drain the car battery when you let the car stands over the night. When the ignition relay fails, it can cause the ignition system to be activated constantly, even when you have removed the keys from the ignition.
What does crank no start mean on a Miata?
It should, if it doesn’t it may mean you don’t have an RPM signal. When you turn the key to the on position confirm the Check Engine Light comes on. If it doesn’t your ECU is not functioning correctly. Remove the oil fill cap and have a friend crank the engine, make sure the camshaft is spinning. If not your timing belt has broken. Check for spark.
How to fix a car that won’t start when you turn the key?
How to fix car that wont crank when you turn the key, no sound or click. How to jump start a car, check the starter, and wire bypass trick. DIY car repair with Scotty Kilmer, an auto mechanic for the last 50 years. Thanks for watching! 1. Bluetooth Scan Tool: http://amzn.to/2nfvmaD 2. Cheap Scan Tool: https://amzn.to/2D8Tvae 3.
Where do you listen when your car is not started?
While one of your friends turn the key to position II, all dash lights on but car is not started; listen carefully at these locations. Under or behind the rear seat, listen inside the trunk near the back of the back seat, listen through the fuel fill with the fuel cap removed.
Why is the panic button on my Mercedes not working?
The panic button and/or trunk unlock features don’t work. Your problem is likely that the fob can start the car but will not allow you to unlock the vehicle’s doors or trunk. In other words, it will not allow you to use the fob as a keyless entry remote. Here are some common reasons for this issue: 1. The key is defective.
There are 4 electronic and/or mechanical modules that are synchronized for everything to work ok: 1. The key (electronic key); 2. The electronic ignition switch (eis, the place where you put your key in); 3. steering locker; 4 the central electronic circuit module.
The newer keys have a transponder integrated in them. The key fob remote serves two purposes. First it disables the anti-theft system when you unlock the car. Second, Drive Authorization System verifies the key to make sure it is the right key to start the car.
What do the lights on the Mercedes dashboard mean?
Modern Mercedes-Benz cars are filled with lots of sensors that monitor how each system in the car is behaving. The lights on the dashboard display what systems are in use and they also highlight when one of those systems is not working as it should. But what do all those different symbols mean?
When does the ESP light turn on in a Mercedes?
To check, try stopping and restarting the engine. If the light remains on after restarting get it checked at a garage as the ESP system is an important safety feature. If you have a diesel Mercedes, this light will turn on when the engine is warming up.