lorenfb
Posts: 1308
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: NissanConnect EV / Telematics Hardware Update, for the post-2G world

Sun Sep 24, 2017 9:54 am

LeftieBiker wrote:The problem with the above is that the car makes no effort to FULLY charge the 12 volt battery even under optimum conditions. It either charges for a fixed amount of time or to a too-low voltage. As a result the 12 volt battery in a pre 2014 will be chronically undercharged unless you use an external charger once or twice a week...


So the 2014+ Leafs have an improved charging algorithm? Haven't heard of this before, is it posted somewhere?
If so, are the pre-2014 Leaf's capable of having the ECU, e.g. the BMS, responsible for 12 battery charging re-flashed?
My 2013 has never had any 12 volt battery issues and I don't use a maintainer, although my SL with PV cell
does supply about 50ma in moderate sunlight over the standby battery drain of about 30ma.

cwerdna
Gold Member
Posts: 7067
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: NissanConnect EV / Telematics Hardware Update, for the post-2G world

Fri Oct 13, 2017 12:20 am

Follow to my posts from 8/24/17 at viewtopic.php?p=502854#p502854 and 9/21/17 at viewtopic.php?p=505934#p505934 about not having a single ! yellow car and P3131, it looks like it finally reared its head several times on 10/12/17. (Will revise this date if I discover that I got any between 8/24 and 10/11.)

I had no autosaved charging locations and disabled the autosaving of them. I left my notebook at work so I don't recall my unplugged status settings.

I got them both (yellow ! car and P3131 DTC) past midnight on 10/12/17. I cleared them and had them return several times again (cleared, to only have to come back later) during the day on 10/12 when I moved my car around. On the night of 10/11/17, I did remotely set the climate control timer to come on at a certain time. It failed with one of these emails "Climate control on failed

Owned LEAF detected a problem and was unable to turn climate control on. If the problem persists please see your dealer."

I don't recall if the car was unattended or I'd actually already gotten into the car and put it into READY by that time.

I noted last night when pulling my car into the garage that 12 volt voltage stayed in 14.xx volts (per Leaf Spy) the whole time instead of dropping down quickly. I plugged in my Optimate 4 12 volt charger last night and when I went to go to work this morning, it still hadn't gone into the ramp down or just trickle charge/maintainer phase. Not sure if the 12 volt was running flat or if there was some extra parasitic drain going on.

Will try pulling fuse 34 tonight.

'13 blue Leaf SV w/premium package (owned)
'13 blue Leaf SV w/QC + LED & premium packages (lease over, car returned)
'06 Prius

lorenfb
Posts: 1308
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: NissanConnect EV / Telematics Hardware Update, for the post-2G world

Fri Oct 13, 2017 9:08 am

cwerdna wrote:
I got them both (yellow ! car and P3131 DTC) past midnight on 10/12/17. I cleared them and had them return several times again (cleared, to only have to come back later) during the day on 10/12 when I moved my car around. On the night of 10/11/17, I did remotely set the climate control timer to come on at a certain time. It failed with one of these emails "Climate control on failed


As I posted previously, once I stopped attempting any use of the Nissan app (remote connecting/pinging),
I've had no DTCs or lockup of the TCU requiring a reset (fuse removal). I can still update the charging locations
without any problems or having the TCU 'hang' and possibly causing the Leaf's CANs to fail to enter sleep mode,
possibly draining the 12V battery. The TCU has a design problem, e.g. there should have been an interrupt
timer used by the TCU's processor to power it down after a time period or if communications have failed.

BrewCrew
Posts: 5
Joined: Thu Jun 15, 2017 12:26 pm
Leaf Number: 403679
Location: Nebraska

Re: NissanConnect EV / Telematics Hardware Update, for the post-2G world

Fri Oct 13, 2017 9:14 am

Does anyone have any insight as to whether or not Nissan is still working on a fix to this issue? It is starting to get cold around here and I'd love to be able turn on the HVAC remotely, but don't want to deal with pulling fuses or a potentially dead 12v battery so I'm not going to have my TCU upgraded unless there is a fix.
2013 SV

WetEV
Posts: 1737
Joined: Fri May 04, 2012 8:25 am
Delivery Date: 16 Feb 2014
Location: Near Seattle, WA

Re: NissanConnect EV / Telematics Hardware Update, for the post-2G world

Fri Oct 13, 2017 8:56 pm

Another fuse pull. Annoying issue. Not quite to the point of getting the modem disabled. Yet.
WetEV
#49
Most everything around here is wet during the rainy season. And the rainy season is long.
2012 Leaf SL Red (Totaled)
2014 Leaf SL Red

Supersleeper
Posts: 77
Joined: Mon Aug 07, 2017 10:04 am
Delivery Date: 06 Aug 2017
Location: SF Bay Area

Re: NissanConnect EV / Telematics Hardware Update, for the post-2G world

Mon Oct 16, 2017 8:20 pm

This would be a relatively simple arduino project. Remove the fuse, and jumper an arduino controlled relay (normally closed), place an in-line fuse, and have the arduino reset the TCU every day for about 10sec at 12AM.

Another way is to intercept the TCU direct +12v wire and leave the fuse box intact. There’s likely some low-power 12v timer circuits already out there also. It’s not a factory fix, but you wouldn’t need to worry about the TCU continuously draining. I doubt Nissan will do anything at this point.

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