DarthBane
Posts: 8
Joined: Wed Apr 12, 2017 6:29 pm
Delivery Date: 04 Mar 2017

Main computer and HV wiring change

Sat Mar 09, 2019 6:31 am

My 2015 Leaf is at the dealership for about 3 weeks now (parts on back order). It has been worked on for active 10 hours minimum, and the result is that they need to change all the high voltage wiring, and the main computer. Water infiltrated in the main computer, and it's cold where I live, so it froze there, causing damage to the computer. If I had to pay from pocket, this repair would cost between 4000-5000 Can$, not something I fancy paying later on. Fortunately, all this is under warranty, and the dealership has treated me very nicely.

What I'm after here, is an idea of how common this issue is. I've been told it is not supposed to happen, the main computer is supposed to be sealed and no water can get in there, normally... But it happened, and my dealership has seen this 3 or 4 times so far. So if they saw it 3-4 times in just 1 dealership, this is not a completely uncommon issue. My concern is that after they do the repair, these parts will be under warranty for 1 year. I am worried of this happening again in a couple of years, and I am starting to consider getting rid of the car before that warranty expires. But, anyone else had this done? I searched the forum but didn't find anything about it, maybe I searched wrong... I've been told that maybe Nissan Canada can tell me the numbers, but I thought I'd start here.

Please let me know if you had, of heard of this problem before, and it anybody had this occur twice.

Thanks a lot!

Dala
Posts: 97
Joined: Sun Oct 28, 2018 11:24 am
Delivery Date: 01 Jan 2015
Leaf Number: 316851

Re: Main computer and HV wiring change

Sat Mar 09, 2019 7:01 am

Bad windshield-seal?
Bad cowl-duct?
Ever been in a collision?

I cannot fathom how water got into the dash. These cars are tight in the front!

DarthBane
Posts: 8
Joined: Wed Apr 12, 2017 6:29 pm
Delivery Date: 04 Mar 2017

Re: Main computer and HV wiring change

Sun Mar 10, 2019 7:58 am

No water in the dash. The computer managing the HV circuit is in a box under the hood I've been told.
That being said, if I've been told wrong, no collisions, no cracks, and no water in the dash. The water infiltrated into the computer box only, which is a "sealed" box.

GerryAZ
Gold Member
Posts: 2243
Joined: Mon Nov 22, 2010 6:47 pm
Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

Re: Main computer and HV wiring change

Sun Mar 10, 2019 1:29 pm

Lithium battery controller (LBC in Nissan's manual also called BMS for battery management system on this forums) is inside the sealed battery case under the car. As far as I know, all other control modules (computers) are inside the car either under the dash or in the console. There are some items under the hood that have controllers built in such as the inverter, DC-DC converter, onboard charger, and brake master cylinder (called intelligent brake controller in the manual).
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+ purchased 8/10/2019

DarthBane
Posts: 8
Joined: Wed Apr 12, 2017 6:29 pm
Delivery Date: 04 Mar 2017

Re: Main computer and HV wiring change

Mon Mar 11, 2019 5:00 am

Ok, LBC under the car, that must be the one. I apologize if I did not identify the computer exactly, it's just that the car is still at the dealership waiting for the parts, and they just told me that the main HV computer and all HV wiring need replacing because of the ice damage.

I just want to know if this is common or not, because it is a 4000-5000$ repair that I am not willing to do after the warranty is over. This will be a big factor for me to decide if I keep it or not.

So, anybody knows someone that had this issue? From the lack of positive answers on this, I assume it is still an uncommon problem, which is good news.

Lothsahn
Posts: 431
Joined: Thu Apr 05, 2018 4:35 pm
Delivery Date: 04 Jan 2018
Leaf Number: 007797

Re: Main computer and HV wiring change

Mon Mar 11, 2019 7:19 am

DarthBane wrote:Ok, LBC under the car, that must be the one. I apologize if I did not identify the computer exactly, it's just that the car is still at the dealership waiting for the parts, and they just told me that the main HV computer and all HV wiring need replacing because of the ice damage.

I just want to know if this is common or not, because it is a 4000-5000$ repair that I am not willing to do after the warranty is over. This will be a big factor for me to decide if I keep it or not.

So, anybody knows someone that had this issue? From the lack of positive answers on this, I assume it is still an uncommon problem, which is good news.

The LBC is located inside the battery pack. The battery pack is sealed from water intrusion with a rubber gasket (2011/2012) or glued (2013+). If water got into the battery pack, it would be very bad, as it would short cells or busbars. Either short would result in cells overheating and over-discharging, which would quickly destroy them and possibly start a fire. A busbar short could be up to 400V, which would almost certainly start a fire.

I have never heard of water getting into the battery pack on a Leaf. You could wait to see if anyone else reports this, but I would seriously doubt it. That said, I would be shocked if the failure was a LBC due to water intrusion. If it were, I would demand that they explain how the battery case leaked water, and confirm that the leak was fixed.

I think it's far more likely that a different computer component was affected. If you want to confirm how common the failure was, you're going to have to understand exactly what failed and where the leak was.
2011 Silver SV, purchased 2018, lives in Missouri (previously in CA)
LeafSpy Pro + BAFX Products OBDII dongle
Battery swap 2019/04/24 (87% SOH, 12 bar)

DarthBane
Posts: 8
Joined: Wed Apr 12, 2017 6:29 pm
Delivery Date: 04 Mar 2017

Re: Main computer and HV wiring change

Mon Mar 11, 2019 7:23 am

I see, ok, I will report back when I get the car back. I know they took the battery out, but not sure why... and they are not replacing the battery. I think it was part of the troubleshooting process. Anyways, I'll keep quiet now until I know exactly what they had to do. Thanks for enlightening me!

User avatar
Nubo
Posts: 5350
Joined: Fri May 28, 2010 11:01 am
Delivery Date: 31 Oct 2014
Location: Vallejo, CA

Re: Main computer and HV wiring change

Mon Mar 11, 2019 8:53 am

DarthBane wrote:No water in the dash. The computer managing the HV circuit is in a box under the hood I've been told.
That being said, if I've been told wrong, no collisions, no cracks, and no water in the dash. The water infiltrated into the computer box only, which is a "sealed" box.

Did they refer to it as the IPDM?
I noticed you're still working with polymers.

DarthBane
Posts: 8
Joined: Wed Apr 12, 2017 6:29 pm
Delivery Date: 04 Mar 2017

Re: Main computer and HV wiring change

Mon Mar 11, 2019 11:58 am

Ok, the part to be replaced is called PDM (Power Distribution Module). It sits on top of the motor, that is the 1st thing you see when you open the hood. But of course it is in a sealed box.

Hope this helps!

LeftieBiker
Moderator
Posts: 12965
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Main computer and HV wiring change

Mon Mar 11, 2019 12:07 pm

There was a recall for some years for PDM reprogramming, but it had nothing to do with water intrusion. I too have never heard of this. If 3 or 4 of them have failed there because of water intrusion, then either your locale has something extreme and bizarre going on weather-wise, or...the dealership is lying. What were the symptoms, and did anything water-related happen before they began?
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

Return to “Problems / Troubleshooting”