Subaru Legacy - Battery Keeps Going Dead For The Last 2 Years
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- Опубликовано: 31 окт 2023
- In this video we have a look at a customers '17 Subaru Legacy that has had a long history of the battery always being dead. She's been dealing with it for 2 years now and wants it fixed.
-Enjoy!
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This is the beauty of RUclips folks. Viewer @Gearhead8604 alerted me of a TSB that I did not see from Subaru. I contacted my customer to let them know of the "repair" available from Subaru. They opted to just leave it as is for the time being. I appreciate all of the comments from others alerting me to the TSB also. You guys are ALL awesome and a really great community of techs, DIY'ers and plain old viewers. Either way I appreciate all of you!
Good morning Eric, I work at Subaru and the Telematics DCM will cause the battery to have a draw. There's a TSB on setting the DCM to factory mode and unplugging the SOS switch which solves the current draw. The vehicle has to currently be unsubscribed to starlink in order to complete this tsb. You can check in obd data to see the DCM subscription status. Best way to check this is to unplug the DCM fuse underneath he underhood fusebox. If the draw goes away immediately that's your problem! The DCM does not need to be replaced.
The problem is that 3G carrier data was shut down by the cellular providers. The module is continuously trying to phone home at increased power with no service. This isn’t just a Subaru problem. 2011+ Fords and Mazda also have this problem. A few early Honda telematics as well. Pull the TCM from the parcel shelf and be done with it.
Too much electronical wizardry on cars these days
I would bet that these stupid things ran on 3g, and when they shut down the 3g towers last year it just constantly tries to reconnect to the now non-existent network, of course fails, and then does it all over again. Subaru probably doesn't really want to "fix" it because they're older cars, and they'd have to start subscribing to 4g/5g service in order for it to work again and probably most cars on the road that used that no longer subscribe anyway, so that's money for nothing for Subaru.
subaru: if you don't pay the subscription we will kill your battery!
"Hello dark current my old friend. I've come to amp clamp you again." 😊 Thanks for the video!
And this is why I drive a 2000 vehicle in perfect condition. Useless electronics on these new vehicles.
Turning off that comms is a feature.
Exact same thing happened on my aunt's 18 Forester. She was taking her Subaru to Costco every 3 months and getting the battery replaced under warranty. I finally convinced her to take it to the shop to get it looked at. She opted for the same 'repair" as this customer since the stealership gave her an estimate over $900 to repair it.
My girlfriend's 2019 Outback had this exact problem. If you drove her car everyday you would never know it had a parasitic current draw, but leave it for a week and the battery was dead. I diagnosed the parasitic draw with a current probe, but since the car was still under warranty I had her take it to the dealer. They pulled the fuse until they could get a replacement data/Starlink/whatever module, which took a couple of months. After the fix, I monitored it carefully for a while -- no parasitic draw. It can sit for weeks now with no battery drain problem. So, it seems, that data module doesn't go to sleep like it should, and the replacement part does. I'm sure Subaru knows all about this problem; the fact that so many of these data modules are on back order, and that they have a service bulletin on it tells me so. They are probably just hoping people will drive their cars everyday and not notice it. They should replace all of the bad modules IMHO.
People are so lucky to have an honest man working on there vehicles. God Bless you and your family Eric.
I bought a three year old car and was disconcerted to see a recent fitting of new alternator and battery. Going through the vehicle, amongst a few other small things I discovered that the glovebox light was not working. It was a bit of a faff to get the unit out (no chance of replacing the bulb in situ) but I did and replaced the pea bulb which was obviously burned out. Before refitting it, I idly pressed the button to watch the bulb turn off. It didn't.
“Sherlock Ohms” triumphs again👏🏼
2020...that's when "everything bad started" You couldn't be more right my friend
Great diagnosis Eric. Way too much useless electronics in cars now a days causing problems IMO. I would of done the same as the customer..Keep the video's coming bud.
The only real down side to disabling the Starlink is that will also disable the microphone for use on handsfree calling paired to your phone.
I wish you had posted this about 2 months ago. My son's car had this issue and it cost me 54.00 for my local shop to read the service bulletin and pull the fuse. I guess there was a class action lawsuit to pay for all the dead batteries.
Eric, your willingness to do what it takes to find the problem and then fix it is ledgentary!
This is the only way Subaru owners would know any thing about this problem. Great work Eric. The voice of honesty.