Intermittent Failure of Electrical Functions
#1
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Mercedes Benz 2008 E350 Basic
Intermittent Failure of Electrical Functions
A couple of times, I will see red battery signal and elevated temperature indication of 185°F on the dash, my windshield wipers would cease, the horn would cease, the cooling system would not come on, the tiny dot red light by the transmission stick would be off, the headlamps and rear lamps would come on, the radiator fan would be blowing continuously independent of the thermostat.
Has anyone experienced this and would you know what the cause is?
Your suggestions would greatly help me and I will appreciate them.
I use a Mercedes Benz 2008 E350 Basic.
Thank you.
Has anyone experienced this and would you know what the cause is?
Your suggestions would greatly help me and I will appreciate them.
I use a Mercedes Benz 2008 E350 Basic.
Thank you.
#2
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2005 CLS55 AMG W219 C219
The electrical system has a couple of components
- Is/are the batteries in good order? Get them measured to know for sure
- Is the alternator providing enough juice when running? If not, it can be alternator or the voltage regulator
- If batteries and alternator are ok, then it might be the BCM aka battery control module
- Other things to consider: bad earth strap(s)/earthing points
- Is/are the batteries in good order? Get them measured to know for sure
- Is the alternator providing enough juice when running? If not, it can be alternator or the voltage regulator
- If batteries and alternator are ok, then it might be the BCM aka battery control module
- Other things to consider: bad earth strap(s)/earthing points
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CaliBenzDriver (06-12-2024)
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MY'14 W212 M276 3.5NA @60kMi
low voltage
The electrical system has a couple of components
- Is/are the batteries in good order? Get them measured to know for sure
- Is the alternator providing enough juice when running? If not, it can be alternator or the voltage regulator
- If batteries and alternator are ok, then it might be the BCM aka battery control module
- Other things to consider: bad earth strap(s)/earthing points
- Is/are the batteries in good order? Get them measured to know for sure
- Is the alternator providing enough juice when running? If not, it can be alternator or the voltage regulator
- If batteries and alternator are ok, then it might be the BCM aka battery control module
- Other things to consider: bad earth strap(s)/earthing points
In addition I would add that car may drain its batteries while parked.
When voltage is too low the weak electrical system is going to develop all sorts of electrical damages.
To prevent that use a smart CTEK float charger.
Don't guess diagnostics, measure voltages. A new battery may not provide lasting relief.
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nd-photo.nl (06-12-2024)
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2005 CLS55 AMG W219 C219
You are 100% correct, I experienced exactly that! I bought 4 new batteries (2x AUX & 2x Main) before I found out I had a power drain.
I dont know exactly how I fixed it, but I replaced a bunch of stuff (BCM, AUX battery relay, pre-fuse, alarm siren) and deleted some things (navigation unit, internal gsm phone, etc)
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MY'14 W212 M276 3.5NA @60kMi
Easter Eggs search... Wonky CAN-B
You are welcome!
You are 100% correct, I experienced exactly that! I bought 4 new batteries (2x AUX & 2x Main) before I found out I had a power drain.
I dont know exactly how I fixed it, but I replaced a bunch of stuff (BCM, AUX battery relay, pre-fuse, alarm siren) and deleted some things (navigation unit, internal gsm phone, etc)
You are 100% correct, I experienced exactly that! I bought 4 new batteries (2x AUX & 2x Main) before I found out I had a power drain.
I dont know exactly how I fixed it, but I replaced a bunch of stuff (BCM, AUX battery relay, pre-fuse, alarm siren) and deleted some things (navigation unit, internal gsm phone, etc)
I feel more fortunate now not having BCM or ABC.
I had a bit of similar experience... the battery drain issue is incremental. There are big drains and many small drains. They are designed to collectively deliver the "MB experience" we are familiar with.
In my chassis, when the car is asleep the drain of system AGM is centered around security polling:
"Are the doors locked + closed?"
Crazy solderless Door Modules stutter through poor connections and make this extra long and power hungry process. It's no better when the car is awaken, still amazingly slow CAN-B straight from factory.
Same stuttering goes on with the engine CAN-C poor bandwidth.
Last edited by CaliBenzDriver; 06-12-2024 at 06:40 PM.
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2005 CLS55 AMG W219 C219
I bought a battery monitor (works via bluetooth). I can highly recommend these things, they are about 20 USD/EUR and they provide you with insight. Something like this:
https://mbworld.org/forums/c219/8443...ml#post8860681
https://mbworld.org/forums/c219/8443...ml#post8860681
Last edited by nd-photo.nl; 06-13-2024 at 02:20 PM.
#7
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MY'14 W212 M276 3.5NA @60kMi
process of elimination.....
this looks like a very handy piece of kit to monitor SOC. Nice BT Application
We're going to see how the battery gets drained gradually as a result of 1,000's extended laborious wake-up cycles.
Many modules are always powered ON but held in a low power mode. Not a problem!
If you want easy fun troubleshooting. You will need a scanner to reset faults you create:
simply unplug CAN-B modules a L+R bus distribution bars.
This will disable modules response to let them sleep perfectly well.
Proceed by halves to evidence L or R side circuits?
Scan whole car for faults prior to unplugging anything so we can gather what else maybe happening.
Don't ever let lead-acid starter battery drain, use a charger until working reliably.
We're going to see how the battery gets drained gradually as a result of 1,000's extended laborious wake-up cycles.
Many modules are always powered ON but held in a low power mode. Not a problem!
If you want easy fun troubleshooting. You will need a scanner to reset faults you create:
simply unplug CAN-B modules a L+R bus distribution bars.
This will disable modules response to let them sleep perfectly well.
Proceed by halves to evidence L or R side circuits?
Scan whole car for faults prior to unplugging anything so we can gather what else maybe happening.
Don't ever let lead-acid starter battery drain, use a charger until working reliably.
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#8
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I wonder if these vehicles have the same 2 battery system on the R230..! If so, perhaps you also have a BCM..! Is that BCM the same used on R230's? A230-540-1045?
As you may know that BCM is the Aquiles tendon of the R230....! Would be nice to find a "safe and long lasting" retrofit for it! Mine recently burned and I am in a quest for finding a way to retrofit in my SL500.!
As you may know that BCM is the Aquiles tendon of the R230....! Would be nice to find a "safe and long lasting" retrofit for it! Mine recently burned and I am in a quest for finding a way to retrofit in my SL500.!
#9
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MY'14 W212 M276 3.5NA @60kMi
I wonder if these vehicles have the same 2 battery system on the R230..! If so, perhaps you also have a BCM..! Is that BCM the same used on R230's? A230-540-1045?
As you may know that BCM is the Aquiles tendon of the R230....! Would be nice to find a "safe and long lasting" retrofit for it! Mine recently burned and I am in a quest for finding a way to retrofit in my SL500.!
As you may know that BCM is the Aquiles tendon of the R230....! Would be nice to find a "safe and long lasting" retrofit for it! Mine recently burned and I am in a quest for finding a way to retrofit in my SL500.!