S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Car wont start

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Old Aug 3, 2023 | 11:35 AM
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jlopez823's Avatar
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2008 mercedes s 550
Car wont start

I have a 2008 mercedes s class 550 and the car wont start. Alarm goes off when I manually open the door and hazard light go off along with the cabin lights however all other lights on the dash don't come up nor does the car respond to the remote start of the keyless entry. I changed the battery in the hood already but still no luck. Any suggestions?
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Old Aug 3, 2023 | 03:33 PM
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Scan for codes, report back here, check for fuel in the tank.

Is this your only car?
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Old Aug 3, 2023 | 03:34 PM
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Sounds electrical, Do you have the big battery in the trunk behind the rear panel?
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Old Aug 4, 2023 | 09:51 AM
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2008 mercedes s 550
Originally Posted by vettebk
Sounds electrical, Do you have the big battery in the trunk behind the rear panel?
I believe so. I thought the battery under the hood is the one responsible for the car to start?
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Old Aug 4, 2023 | 12:47 PM
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The front battery is the starter battery. The rear battery is the consumer battery. If the rear battery goes flat and needs replacement, the car will shut down electrically systems selectively to prevent total battery failure. Low voltage causes all kinds of issues. You need to know that both batteries are fully charged and in good shape. Then pull the codes from a MB compatible scanner. Report back your codes.
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Old Aug 4, 2023 | 01:58 PM
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Originally Posted by jlopez823
I have a 2008 mercedes s class 550 and the car wont start. Alarm goes off when I manually open the door and hazard light go off along with the cabin lights however all other lights on the dash don't come up nor does the car respond to the remote start of the keyless entry. I changed the battery in the hood already but still no luck. Any suggestions?
What do you mean by the manually opening the door and alarm go off?
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