openair Posted June 3, 2015 at 12:00 AM Report Share Posted June 3, 2015 at 12:00 AM From an old post on the full hybrid forum, to perform a hard reset to wipe the keep alive memory: Disconnect negative 12v terminal and pull the HVB disconnect. Wait an unknown amount of time. Is this correct for an Energi as well? Should any data, such as trips and the average fuel economy within the empower and such screen, survive this and a master reset? Is it possible, necessary, a good/safe idea (without pulling the HVB disconnect) to perform a hard reset by: Disconnecting negative and positive terminals and holding them together. (No mention of the HVB disconnect). This is what my dealer has said they have done and is the how to reset the keep alive memory. I attempted to do so but there did not appear to be enough slack in the negative and positive cables to accomplish this. Quote Link to comment Share on other sites More sharing options...
jdbob Posted June 3, 2015 at 12:24 AM Report Share Posted June 3, 2015 at 12:24 AM There's no point in disconnecting the HVB. It won't be connected to anything because you disconnected the 12V battery which is used to energize the relays. Quote Link to comment Share on other sites More sharing options...
openair Posted June 3, 2015 at 02:08 PM Author Report Share Posted June 3, 2015 at 02:08 PM There's no point in disconnecting the HVB. It won't be connected to anything because you disconnected the 12V battery which is used to energize the relays.That's nice. This was also debated two years ago in the hybrid forum. As far as the rest of the hard reset... Would you suggest following the advice I found in the hybrid forum or the dealership's? Which is correct for an energi? Should any data such, as trips, survive this kind of reset? Quote Link to comment Share on other sites More sharing options...
jdbob Posted June 3, 2015 at 07:05 PM Report Share Posted June 3, 2015 at 07:05 PM I don't see any reason to hold the negative and positive cables together. Just leave the battery disconnected for 10 minutes to make sure any capacitors inside the modules fully discharge. Quote Link to comment Share on other sites More sharing options...
Hybridbear Posted June 7, 2015 at 07:01 PM Report Share Posted June 7, 2015 at 07:01 PM We did not lose any settings when doing the hard reset on our old FFH following the procedure described above. No trip meters were reset. Quote Link to comment Share on other sites More sharing options...
openair Posted June 9, 2015 at 03:22 AM Author Report Share Posted June 9, 2015 at 03:22 AM It seems to me that if data such as trips and, as I recently discovered, seat minding and mykey settings are not return to defaults by either or both a hard and master reset that there must be some way to completely reset the vehicle? Quote Link to comment Share on other sites More sharing options...
murphy Posted June 9, 2015 at 09:36 AM Report Share Posted June 9, 2015 at 09:36 AM It is not possible to completely reset the vehicle. Federal law prohibits resetting of the odometer. The trip meters are probably stored in the same non-volatile storage as the odometer. The other items can probably be reset by the dealer's diagnostic computer. There would be a lot of complaints if the car did a complete reset every time the 12 volt battery died which is all that a hard reset is. Disconnecting the HVB does nothing since it is already disconnected by the relays opening when the car is turned off. Quote Link to comment Share on other sites More sharing options...
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