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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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V70 2.3 w/ crossed battery terminalsViews : 845 Replies : 14Users Viewing This Thread : |
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Sep 19th, 2018, 01:31 | #1 |
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Location: São Paulo
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V70 2.3 w/ crossed battery terminals
Hi guys, i'm negotiating a 2000 V70 2.3 which the previous owner said that a friend, while doing a service, crossed the battery terminals and the car "won't start and nothing lights up in the dashboard".
So, knowing that these cars have lots and lots of electronics, how bad it's this? Do the just blow some fuses and spare the electronic modules or they just die along? I've read that the main culripts when crossing battery terminals that the car won't even start are the "J fuses" in the fuse box, is it correct? Thanks in advance for any replies. |
Sep 19th, 2018, 18:06 | #2 |
Curmudgeon with a turbo
Last Online: Jul 1st, 2020 17:48
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Location: Congleton
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Hi, I'd suggest checking all fuses/fusible links as a start. It's possible though that even if fuses have blown and protected some circuits that damage has occurred to others.
Personally, if I was looking at a car that was completely "dead" and I knew the battery had been connected backwards I'd price it as scrap value. It's a big gamble really, do you try and replace any obvious blown fuses & risk the car starting right up and the seller deciding to up the price, or do you buy it "as is" and take the chance that it may be a parts car? There is also the possibility that the electrical mistake & subsequent fault might be a cover up attempt to sell a car with a ruined engine/transmission etc as a potential "easy fix". It depends on how much you want this particular car/how much of a gambler you are. For me, if the price is close enough to scrap/parts value (or I could get another of the same model, good runner with accident damage to swap parts between and make one good car) then I'd probably roll the dice.
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Sep 19th, 2018, 20:46 | #3 |
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Last Online: Apr 22nd, 2024 13:38
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also you may have blown the alternator rectifier,
remove the CEM and have a good look at that, The ECU will be blown, you may be able to clone that if the flash rom and eeprom is ok, that Dave |
Sep 19th, 2018, 20:53 | #4 |
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if you are thinking about getting this, I would say walk away,
Dave |
Sep 20th, 2018, 00:19 | #5 | ||
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Location: São Paulo
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Quote:
Here where i live, Volvos are PRETTY rare, you don't find any of them even in the city centers, nor for sale. And the seeler isn't that great, the comments about it (it's a dealership, in fact) isn't comforting either. So, knowing that these cars has a lot of electronics, i'm very afraid of getting one, even though it's basically, my dream car. Thanks for the advice, i'll try to see the car even in that condition and i'll post some updates tomorrow. Quote:
It's in the engine compartment, right? |
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Sep 20th, 2018, 07:26 | #6 |
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Last Online: Feb 8th, 2023 21:32
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Location: Tamworth
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It the fix was simple then you can bet the owner would have done it already. The chances are it’s been to someone who knows at least a bit about cars and they have said to sack it off. It could be so much hassle so as above I would value it at scrap so at least you can’t lose.
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Sep 20th, 2018, 07:34 | #7 |
Senior Member
Last Online: Oct 30th, 2023 18:03
Join Date: May 2011
Location: Southampton
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All automotive electronics are tested for reverse battery connection - you will probably have blown some fuses, but there would have to be another fault present before it damaged the electronics.
That being said, other users warnings of it masking other issues should be taken into account! |
Sep 20th, 2018, 08:49 | #8 | |
Premier Member
Last Online: Apr 22nd, 2024 13:38
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Quote:
you will need to de-solder the flashrom from the old ecu and reprogram the new ecu, and you need to read the eeprom in old ecu then program the data in to the nee ecu, or unsolder the eeprom and flashrom and fit them in the new ecu only if chips are ok and working, Dave |
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Sep 20th, 2018, 09:15 | #9 |
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Last Online: Mar 6th, 2020 09:54
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Location: Southampton
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I'd ignore the doom merchants initially. Go and check some fuses, look for the main fuse, I suspect it might be blown. Had very similar with an impreza recently. The main fuse had blow. £3 for a new one and it was back to normal afterwards.
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Sep 20th, 2018, 13:18 | #10 | |
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Last Online: Feb 7th, 2023 17:45
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Location: london
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Quote:
You say Volvos are rare in Brazil and you don't even see them in the cities. Even if you could get the problem diagnosed you may find it impossible finding used spares (or firms knowledgeable in repairing Volvo electronics). |
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