CMorrisonLeaf2013
Posts: 14
Joined: Thu Nov 18, 2021 2:29 am
Delivery Date: 03 Nov 2021

Cold inside. Heater on blink

Hi. Bought our 2013 leaf 2 weeks ago and it's a dream to drive. Living in the North Scotland we need the heater on every day. It was working fine up until 2 days ago. I've been searching forums to find answers.

The blower still works so not the 12v fuse.
First thing I found was people having to replace heater
2nd thing was perhaps a rewire by nissan.

I have some mechanic friends and family so I'm hoping to fix it DIY. Is it possible the fluids need topped up?
LeftieBiker
Moderator
Posts: 18845
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Cold inside. Heater on blink

Welcome to the forum. Is this one of the models equipped with the heat pump? I'm guessing that with zero heat it isn't. The likely suspects are either a blown resistance (PTC) heater fuse or a burned out PTC heater. If the fuse blew then the heater is quite possibly also bad. Let's hope that it's something less expensive, though. Ideas, folks?

Oh, and starting in 2013 there is no "coolant" used in the heater. It is a direct to air heater.
Brilliant Silver 2021 Leaf SV40 W/ Pro Pilot & Protection
2009 Vectrix VX-1 W/18 Leaf modules, & 2 lithium E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.
goldbrick
Posts: 1732
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Boulder, CO

Re: Cold inside. Heater on blink

Would a blown PTC heater throw a code?

If you don't already have it, check out LeafSpy. It's an app that allows you to communicate with the OBDII port. Other generic OBDII readers can also read trouble codes so it might make sense to start there. But LeafSpy is truly the gold standard for OBDII on Leaf and it's not expensive.
CMorrisonLeaf2013
Posts: 14
Joined: Thu Nov 18, 2021 2:29 am
Delivery Date: 03 Nov 2021

Re: Cold inside. Heater on blink

So at last got round to meeting my mate who is diagnostics man. He plugged in his plug.

No fault codes present except 1.

B2631-00 Sunload Sensor CRNT

No indication that the heater circuit is broken or the heater ain't working.

Anybody know anything about this sensor and how it links to whether the heater runs or not?
LeftieBiker
Moderator
Posts: 18845
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Cold inside. Heater on blink

The sun load sensor determines how strongly the A/C should run. I wouldn't be surprised, though, if it also affected heater output. Nonetheless, I wouldn't expect zero heat from a faulty sun load sensor. I do hope that I'm mistaken, for your sake. IIRC, the sensor is located in the top of the dashboard, or up by the mirror.
Brilliant Silver 2021 Leaf SV40 W/ Pro Pilot & Protection
2009 Vectrix VX-1 W/18 Leaf modules, & 2 lithium E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.
CMorrisonLeaf2013
Posts: 14
Joined: Thu Nov 18, 2021 2:29 am
Delivery Date: 03 Nov 2021

Re: Cold inside. Heater on blink

We seen the sunload sensor voltage and covered it up and seen the change.

We seen the temperature sensor was 32 Fahrenheit which would be zero Celsius. Which is just about right today's cold.

We also seen the heater output voltage was zero. As if its not there.

I was told to check the output signal from computer and input power to heater. I'm now hoping for a loose connection. What connections can I check? Where do I start? How do I check across the fuse and across heater without having to remove too much?
CMorrisonLeaf2013
Posts: 14
Joined: Thu Nov 18, 2021 2:29 am
Delivery Date: 03 Nov 2021

Re: Cold inside. Heater on blink

FYI it is PTC heater
CMorrisonLeaf2013
Posts: 14
Joined: Thu Nov 18, 2021 2:29 am
Delivery Date: 03 Nov 2021

Re: Cold inside. Heater on blink

It is PTC heater
LeftieBiker
Moderator
Posts: 18845
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Cold inside. Heater on blink

That's a shame.
Brilliant Silver 2021 Leaf SV40 W/ Pro Pilot & Protection
2009 Vectrix VX-1 W/18 Leaf modules, & 2 lithium E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.
CMorrisonLeaf2013
Posts: 14
Joined: Thu Nov 18, 2021 2:29 am
Delivery Date: 03 Nov 2021

Re: Cold inside. Heater on blink

I am now looking through wiring and fuses under the bonnet. There is a control box to the left hand side.

nissan 284b7 3neoa

I want to get under this and see but the wiring harness holds it down. Can't find any information on Google.

Next I will pry out the sunload sensor see if it can be left out

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