2012 CLS550 4MATIC No Crank/No Start HELP!!!

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Old Dec 8, 2023 | 01:23 PM
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2012 CLS550 4 matic
2012 CLS550 4MATIC No Crank/No Start HELP!!!

Need some help. I was driving my car and when i was exiting the highway the car died on me. I clicked it into neutral and coasted to the light and my kids were behind me, thought I needed a just since my push button wouldn't restart the car. I tried the key and same results. I did have a warning to see owners manual when it died but I didn't get to read all of it before I tried restarting it. Got it towed home and started troubling shooting, check starter fuse, starter relay and then every fuse, all are good. Still have complete power with the key but never hear the starter Bendix engaging the flex plate. I couldn't reach the starter itself but I was getting power to the starter solenoid. I was thinking starter or Steering Lock Mechanism, since my steering wheel isn't locked and does not lock with the key out.

Got a new scan tool and these are the codes I had.
EZS - Electronic Ignition Lock (N73) - C12100 - Communication with ESP has a malfunction
BCM - B1440-00 - Power Mode Master Input Circuits mismatched
TDM (Theft Deterrent Module) - B3935-57 - Transponder Authentication Error

​​​​Car is at the shop and they said its the starter because its blowing the starter fuse when they try and start it (Even though it wasnt blown the 3 weeks i was trouble shooting it) Well they replaced the starter and still nothing.
​​​​Now they are saying the engine is seized????? Wouldn't i have felt all kinds of things while driving the car if the engine is seized? i was in Drive when it shut off, no backfire, no popping, or lurching in the drivetrain, nothing at all.

Any help or advice will be greatly appreciated.
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Old Dec 8, 2023 | 03:03 PM
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2012 Mercedes Benz CLS550
You need a Xentry to dig deeper into those codes. This sounds like an electrical problem. You may want to check the connector on the ECU. If it's covered in oil you got your answer. You probably have 85k ish miles? could just be wiring shorting out. We know the oil to ECU problem on the 218 exists. And you've got random unrelated codes and a dead car. ECU i believe is under the right seat ( passenger in usa ) but i don't know that for certain. You can pull the cam pos sensor connector ( good luck, it's going to break the tab lock, cleaning them helps a little ) if the connector is full of oil then you definitely need to check the ECU. You don't want to encourage shorts so you may want to pull the battery while it sits. Dealer would be the second recommendation. Swapping parts at random doesn't work anymore.
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Old Dec 8, 2023 | 03:55 PM
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Originally Posted by jerellorenzo
You need a Xentry to dig deeper into those codes. This sounds like an electrical problem. You may want to check the connector on the ECU. If it's covered in oil you got your answer. You probably have 85k ish miles? could just be wiring shorting out. We know the oil to ECU problem on the 218 exists. And you've got random unrelated codes and a dead car. ECU i believe is under the right seat ( passenger in usa ) but i don't know that for certain. You can pull the cam pos sensor connector ( good luck, it's going to break the tab lock, cleaning them helps a little ) if the connector is full of oil then you definitely need to check the ECU. You don't want to encourage shorts so you may want to pull the battery while it sits. Dealer would be the second recommendation. Swapping parts at random doesn't work anymore.
Thank you, I did read about the oil in the connectors and ECU, going to tell the shop to look there.
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Old Dec 12, 2023 | 10:24 AM
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Sounds to me like something electrical here is on the fritz. Engine seized? Did they try to turn the engine at the crank? How did they come to the conclusion the engine has seized?
I agree with the comment above with the engine harness has to be checked, its a very well known issue with this chassis models.
I cant see how the engine just up and seized while you were driving the car and all was ok, hydrolock will cause an engine to seize but you would of have been driving thru water and flooded the engine and caused it to instantly stop running after some serious coughing. But what you are describing here is some electrical part just decided to stop working.

Good luck

PS. Also forgot to mention that the way it died on you also sounds like the torque converter locked up, and if that is it would explain the starter fuse being blown every time they try to engage the starter.
Alot of older cars use to have this problems in my experience when i worked on cars especially GM's. its a shot in the dark but it would help with the diagnosis. They should be able to scan the trans and see if there are any codes.

Last edited by BBS63; Dec 12, 2023 at 10:29 AM.
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Old Sep 5, 2024 | 03:01 PM
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Okay all, the still fighting this issue. 1. Starter is good and disconnected. 2. Engine is not seized. 3. Starter fuse blows when keys is in the 2nd position (ON) not the start position. 4. new starter relay installed and if starter relay is removed the starter fuse does not blow.

Does anyone have wiring diagram from the ignition switch to the fuse block? I already have the fuse block to the starter and pre0fuse block diagrams but cannot locate a EIS schematic anywhere. any other ideas please let me know.
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Old Sep 5, 2024 | 03:21 PM
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2012 Mercedes Benz CLS550
Originally Posted by millercas2003
Okay all, the still fighting this issue. 1. Starter is good and disconnected. 2. Engine is not seized. 3. Starter fuse blows when keys is in the 2nd position (ON) not the start position. 4. new starter relay installed and if starter relay is removed the starter fuse does not blow.

Does anyone have wiring diagram from the ignition switch to the fuse block? I already have the fuse block to the starter and pre0fuse block diagrams but cannot locate a EIS schematic anywhere. any other ideas please let me know.
Whats the vin?
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Old Sep 5, 2024 | 03:24 PM
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WDDLJ9BB0CA027085
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Old Sep 9, 2024 | 12:30 PM
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Okay, I have done more troubleshooting. I found a few schematics online. I do NOT have ECO Start/Stop. I have disconnected my ECU (N3/10) One schematic shows that the pre-fuse block powers relay N through circuit 30 so i removed relay N and it still blew the starter relay. Circuit 30 also powers Relay J (circuit 15) and removing relay 15 the start fuse do NOT blow. I have swapped relay J and K as they are the same relay and the fuse still blows. so does that mean circuit 15 is where my short is at? and if so where should i look? could it be in circuit 31? (schematic below) with the ecu being disconnected relay J is the only power source i can see. any ideas please let me know. Also my dash is displaying "dont forget your key" message as soon as i insert my key, in position 1 and 2 the message says "remove key from ignition" the steer wheel is NOT locked. any other information needed please let me know.





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Old Sep 11, 2024 | 03:17 PM
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2012 CLS550 4 matic
Any luck?
Wiring diagram electronic ignition switch (EIS) control module MODEL 218 with engine 278 is what I'm needing.
Only finding model 203 EIS and 245
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