lorenfb
Posts: 1391
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: 7198
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: 1391
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: 1764
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: 79
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.

tagleader
Posts: 1
Joined: Tue Feb 28, 2012 12:13 pm
Delivery Date: 20 Jan 2012

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

Wed Oct 18, 2017 8:08 pm

So I was pulling my hair out until I found this thread... After leasing my 2014 Leaf for 3 years, around Apr 3 I bought it out at a nice discount and had them throw in the 3G module upgrade. That's when my problems started :)

12V battery died about 2 weeks later. Took it to Advance Auto, they said the battery looks to have a failing cell. Bought a replacement and figured no big deal - 3 years on a factory battery is probably fine.

A few weeks later the new battery was dead in the morning. Took it to the dealer with 2k left on the 36k warranty. They kept it for a week - no problems found.

Started reading this forum talking about charging profiles for the 12V battery. So I tried to stop leaving the L2 charger plugged in for too long, and started checking the 12V levels some evenings, bought a desulphating trickle charger and started plugging it in every few days.

Tried to baby the 12V battery for the next few months. Things were generally good though I started trusting the Leaf less and made sure my ICE vehicles were maintained and ready to go as backups each morning :(

Nissan Connect started being unreliable a couple weeks ago and stopped responding entirely last week. A day or so later the 12V battery died again and the dreaded yellow ! car showed up on the dash. Ordered and received and LeLINK ODBII yesterday and downloaded LeafSpy last night. Read and copied the 10 or so DTC codes and started searching this forum again.

Found and read way too much of this thread last night. This morning found the Audio fuse (20A in the left middle of the fusebox to the left of the 12V battery). By the time I drove to the office the Nissan Connect was working again.

Skip to here if you are in a hurry:
Long story to ask one question: Does anyone know which one of these two theses is true of how this failure happens?

1) Does the TCM pull more than the 2G module during normal operation, draining the 12V battery and locking up the TCM module?
OR
2) Does some failure in the Nissan Connect connection cause the TCM to lock up, and at that point it starts draining the hell out of the 12V battery until it fails and the Yellow!Car appears?

Basically I want to know if 1) I need to keep monitoring the battery and make sure it stays topped up, or 2) just reset the TCM (via the audio fuse) as soon as it doesn't respond, in order to prevent the 12V battery from draining?

Thanks.

WetEV
Posts: 1764
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

Wed Oct 18, 2017 8:39 pm

tagleader wrote:2) just reset the TCM (via the audio fuse) as soon as it doesn't respond, in order to prevent the 12V battery from draining?


I have "Leaf manager", and it updates after every drive. If it fails to update, I pull the fuse. Once every couple of months or so.
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

lorenfb
Posts: 1391
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

Wed Oct 18, 2017 11:41 pm

tagleader wrote:1) Does the TCM pull more than the 2G module during normal operation, draining the 12V battery and locking up the TCM module?
OR
2) Does some failure in the Nissan Connect connection cause the TCM to lock up, and at that point it starts draining the hell out of the 12V battery until it fails and the Yellow!Car appears?

Basically I want to know if 1) I need to keep monitoring the battery and make sure it stays topped up, or 2) just reset the TCM (via the audio fuse) as soon as it doesn't respond, in order to prevent the 12V battery from draining?

Thanks.


1. This hasn't been determined, but most likely not.
2. This is the most likely scenario. It's not likely that the TCU by itself in the short term, e.g. a few days,
will drain the battery, but that if the TCU fails to enter its 'sleep' mode other ECUs on the CAN will
stay 'alive' contributing to the battery drain.

It appears that the TCU can 'hang' when using the Nissan app and communicating with the Leaf,
e.g. turning on heating, and thereby failing to power down (enter sleep mode). Since having
avoided using the Nissan app, my TCU has never required a fuse removal nor has the 12V
battery failed.

GerryAZ
Gold Member
Posts: 1463
Joined: Mon Nov 22, 2010 6:47 pm
Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

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

Sun Oct 22, 2017 1:23 pm

I have some more information to add: I had the EV System timeout and TCU communication errors this morning even though I did not use the EV Connect app to check status or start climate control. I received the EV System warning light when I turned the car on this morning and failed to get the plug-in reminder message after parking at home last night. Since my new AGM battery maintains a higher voltage while parked than the original, I don't think 12-volt battery level is the key issue.
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015

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