BeachLeaf
Posts: 43
Joined: Wed Jan 23, 2019 1:16 pm
Delivery Date: 23 Jan 2019
Leaf Number: 312709
Location: San Luis Obispo

Re: TCU Upgrade Question

Wed Apr 01, 2020 12:28 pm

Hi all, I had my TCU replaced on my 2015 at the beginning of last year (2019). I don't access the Connect app all that often and at the times I have - its been a bit finicky. I've even had to go to the car to log out and then log back in to "restart" the system. Recently, I was unable to use it all. I contacted the Nissan Leaf Owners Connect department customer services and because all the details of the TCU info were starred out and I was logged out of the system, I was told I would need to go to the dealer for a repair (presumably a hardware failure).

I located a YouTube video of a guy who unhooked his negative battery terminal for at least five minutes and was able to "restart" the system (TCU). I had done this procedure earlier in the day, yet did not leave the 12 volt auxiliary battery disconnected for five minutes. I tried it last night and was able to log in and see all the TCU info and the app is now functional again :-)

I did replace the 12 volt auxiliary battery some months ago and wonder if that created/caused the issue...

Stay safe all and be well!

Mark
* 2015 Leaf Cayenne Red SL
*Chrome Amber Signal Bulbs
*6K LED License Lamps
*6K LED Reverse Lamps
*6K LED Fog Lamps
*Strobing 3rd Brake Light
*Fiam Freeway Blaster Dual Tone Horns
*Brushed Stainless Front Nissan Mini Novelty Plate

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jlv
Moderator
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Joined: Thu Apr 24, 2014 6:08 pm
Delivery Date: 30 Apr 2014
Leaf Number: 424487
Location: Massachusetts

Re: TCU Upgrade Question

Wed Apr 01, 2020 1:38 pm

Pulled the fuse on the TCU is the easier way to accomplish this.
LEAF '13 SL+Prem (mfg 12/13, leased 4/14, bought 5/17, sold 11/18, 34K mi, AHr 58, SOH 87%)
Tesla S 75D (3/17, 45K mi)
Tesla X 100D (12/18, 23K mi)
ICE free since '18
100K+ 100% BEV miles since '14

BeachLeaf
Posts: 43
Joined: Wed Jan 23, 2019 1:16 pm
Delivery Date: 23 Jan 2019
Leaf Number: 312709
Location: San Luis Obispo

Re: TCU Upgrade Question

Wed Apr 01, 2020 2:36 pm

jlv wrote:
Wed Apr 01, 2020 1:38 pm
Pulled the fuse on the TCU is the easier way to accomplish this.
Given fuse location and small size, for me it seemed easier to disconnect the negative battery cable. I will say using the fuse method would at least maintain radio settings etc. I did note that now my dash clock is off by 10 minutes... Hoping that will correct the next time I go to use the car.

Is the TCU fuse under the hood? If so, passenger or driver's side?

Thanks for the input :-)

Mark
* 2015 Leaf Cayenne Red SL
*Chrome Amber Signal Bulbs
*6K LED License Lamps
*6K LED Reverse Lamps
*6K LED Fog Lamps
*Strobing 3rd Brake Light
*Fiam Freeway Blaster Dual Tone Horns
*Brushed Stainless Front Nissan Mini Novelty Plate

GerryAZ
Gold Member
Posts: 2630
Joined: Mon Nov 22, 2010 6:47 pm
Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

Re: TCU Upgrade Question

Wed Apr 01, 2020 9:46 pm

The fuse to pull is under the hood in the fuse box by the battery.
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; traded 8/10/2019 at 82,436 miles
White LEAF 2019 SL Plus purchased 8/10/2019

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Stanton
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Re: TCU Upgrade Question

Thu Apr 02, 2020 7:47 am

...and discussed extensively in this thread https://mynissanleaf.com/viewtopic.php?f=31&t=21573
Yes, it's long, but pretty much the "master thread" for TCU upgrade/replacement.
2011 Blue Ocean SV w/floor mats & window tint
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