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Discussion Starter #1
My EV 12V battery died. Charged it fully. Gauges and accessories came back. Now I get “Drive system engine off” and “HV battery at reserve” Tried charging it but doesn’t seem to be taking charge. I removed the red cable from the 12V trying to reset the computer but no change.
 

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How long was your 12v battery dead? What year is your car and is it the original battery? There are a number of threads where this has happened. Some have been successful having a dealer or a shop with that program clear and reset. Unfortunately some have not. Hopefully others will chime in with help. Please keep us posted.

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
 

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When was your smart build?
 

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Send us your VIN and we can give you build data.

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
 

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Discussion Starter #5
How long was your 12v battery dead? What year is your car and is it the original battery? There are a number of threads where this has happened. Some have been successful having a dealer or a shop with that program clear and reset. Unfortunately some have not. Hopefully others will chime in with help. Please keep us posted.

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
Thanks for your response.
It is a 2014. Original battery with around 25k miles. The card was driven and charged fully 3 weeks prior the ‘this issue. No other signs of a problem
 

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So the car had not been driven in three weeks? Any chance a light was left on or something else drained the 12v battery? Did your car have the service update on the battery done? It wasn't a recall, so you would not have been notified about it, but if your car went to a dealer for service, they should have done the update. A search here will give you more info about that. One of mine that was bought in late 2015 had not had it done when I bought the car. The other one bought in 2017 did have it done. I think the update came out in 2016 or so. There is some thinking here that that update might help to prevent the HV battery from "bricking" when the 12v battery is dead for awhile.

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
 

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Discussion Starter #7
So the car had not been driven in three weeks? Any chance a light was left on or something else drained the 12v battery? Did your car have the service update on the battery done? It wasn't a recall, so you would not have been notified about it, but if your car went to a dealer for service, they should have done the update. A search here will give you more info about that. One of mine that was bought in late 2015 had not had it done when I bought the car. The other one bought in 2017 did have it done. I think the update came out in 2016 or so. There is some thinking here that that update might help to prevent the HV battery from "bricking" when the 12v battery is dead for awhile.

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
Thanks much! I don’t think anything was left on but would swear to it. It has not had any service updates that I am aware of. We’ve had it a couple years and it’s only been in for service once. It’s going to the dealer next week. Hope they can fix it.

Reed
 

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Good luck. Tell the dealer to specifically do any updates applicable to your car. There should be no charge to have them done when your car is in for service. Again, please keep us posted.

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
 

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Discussion Starter #9
How long was your 12v battery dead? What year is your car and is it the original battery? There are a number of threads where this has happened. Some have been successful having a dealer or a shop with that program clear and reset. Unfortunately some have not. Hopefully others will chime in with help. Please keep us posted.

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
How long was your 12v battery dead? What year is your car and is it the original battery? There are a number of threads where this has happened. Some have been successful having a dealer or a shop with that program clear and reset. Unfortunately some have not. Hopefully others will chime in with help. Please keep us posted.

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
According to the dealer the HV battery needs to be replaced. Cost is $10k. I only paid $7500 for the car so I can’t justify the fix. Guess I’ll sell it for parts.
 

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So sorry to hear that. :(

Did the dealer give you any more info other than the HV battery needs to be replaced? Did the service ticket tell you anything?

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
 

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So what's wrong with the battery?

I know, the only replace the whole battery, but that doesn't mean you can fix ist for cheap. Normaly it's only some small thing, that needs to be redone.
 

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Will be looking at car tomm, all day today I have my 12v charger on the 12v battery, after trying to start it for a while yesterday I ran it down. I am going to look for more chaffed harness wires etc. Any other suggestions to get it started please help.
 

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Discussion Starter #13
So what's wrong with the battery?

I know, the only replace the whole battery, but that doesn't mean you can fix ist for cheap. Normaly it's only some small thing, that needs to be redone.
The report had many codes. 23507 HV battery internal fault plus many more. Bottom line was “fault codes reoccur to replace component G5 battery.
At $10k and only 24 month warranty it just doesn’t make sense. I’ll probably try to sell it for parts or donate it to a school for their automotive repair class.
 

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VIN is WMEEJ9AA0EK782229
Looks like a ship date of 3/18/2014. Send me a PM with your e-mail address and I'll send you a copy of the data card rather than taking up space here.

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
 

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The HV battery is never totally discharged if I understand things correctly. Even when it indicates that it is totally discharged and the car stops, it is apparently programmed so that a total discharge to you is actually maybe a 95% discharge or so. That's a built in safety feature. Same thing happens at the upper end. A 100% charge is only about a 95% charge in reality.

What we have seen happen is that a discharged 12v battery causes issues with "talking" to the HV battery. We think that the actual cells in the HV battery are still good, but that the part or parts that stop communication are not individually replaceable, at least by Mercedes/Smart dealers. Thus the need to replace the entire unit.

Again, please take my thoughts with a grain of salt. If anyone has better info or can correct me, please do so.

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
 

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Discussion Starter #18
VIN is WMEEJ9AA0EK782229
Another question. Why is the HV battery ruined when it is totally discharged?
The HV battery is never totally discharged if I understand things correctly. Even when it indicates that it is totally discharged and the car stops, it is apparently programmed so that a total discharge to you is actually maybe a 95% discharge or so. That's a built in safety feature. Same thing happens at the upper end. A 100% charge is only about a 95% charge in reality.

What we have seen happen is that a discharged 12v battery causes issues with "talking" to the HV battery. We think that the actual cells in the HV battery are still good, but that the part or parts that stop communication are not individually replaceable, at least by Mercedes/Smart dealers. Thus the need to replace the entire unit.

Again, please take my thoughts with a grain of salt. If anyone has better info or can correct me, please do so.

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
Thanks very much! It does seem like a “communication” issue that should be fixable. By someone much smarter than me I’m afraid. I’m not going to ditch the car just yet. It’s not hurting anything sitting in the driveway. It’s not hurting anything sitting in the driveway.
 

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Good idea to hang onto the car for a bit. There are guys here with much more knowledge about this than I. Maybe one or more of them will chime in and maybe find a fix.

Len
2014 EV Coupe 19,500 miles
2014 EV Cabriolet 17,000 miles
 

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After a few days of not being able to use my 2013 ED and many months with hit or miss errors.
I opened my hatch, removed a few things, chg cables and spare tire.
I opened the plastic hatch that allows rear bulb changing, and pulled on some of the wires and plugs.

Now my car starts and drives without errors.
I know the chaffing was in that area so I just thought move them around and see!

BERY HAPPY!!!
 
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