Disconnecting the Batteries
Slowly working through a string of issues on my V50 1.6D Drive (egr, dpf – the usual). I have VIDA but, annoyingly, about half the time it will not communicate with the ECM (another issue I need to look at).
I need to do some work on the climate control module and CEM, which needs the battery disconnected so as not to trigger the alarm. Does disconnecting the main battery also disconnect the secondary battery, or does that have to be disconnected separately to completely cut power to the system? And will disconnecting the battery for 10 or so minutes reset the ECM (clear the codes)? Thanks |
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No you don't need to do anything with the support battery , it is only engaged when the car is in STOP mode of the Start/Start system. No , codes will not be erased when you disconnect the ECU . . |
Thanks Clan, that’s very helpful. It would explain why my Autel can still read generic powertrain codes when VIDA fails.
Tried it with a charger this evening, still no luck communicating with the ECM, but I think my main battery is on its way out, it was reading 11.7V after a drive today and the charger struggled to get it above 12.3. From what you say this would be why VIDA sometimes can’t find the ECM – the weather at the moment certainly won’t help either! I’ll pick up a new battery and continue my fault finding, often a good fresh battery is enough to drive out a load of electrical gremlins on its own. Is it wise to stick with a Genuine Volvo battery or will it be happy with another decent quality brand? Cheers |
Battery
I can't comment on your main points, but I've just replaced the OEM battery on my 2010 C30. I chose a Bosch which came with a 5 yr warranty, bought it from Tayna who were excellent. The OEM battery had Made in Germany on it, so for all I know it is unbranded Bosch anyway. Obvs early days, but no problem fitting it and at £113 a lot cheaper than you'll pay for a Volvo branded battery.
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Regarding battery get a quote from a dealer parts dept for the part , Excluding fitting . , they are very competitively priced . ... |
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The 'genuine' main battery I bought from Volvo a few weeks ago was only £99 (Inc VAT)
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You weren't kidding!
£130 for a genuine AGM Stop-Start battery from my local dealer. Picking it up next time I go past. Probably wouldn't even have considered going to the dealer had I not posted here. ... if only the genuine EGRs were so reasonably priced... |
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