brainy19
Posts: 10
Joined: Sun Jun 23, 2019 12:45 am
Delivery Date: 23 Jun 2019

Key fob sometimes worked, sometimes didn't.

Mon Aug 24, 2020 3:35 pm

Hi everyone,

I'd like everyone's opinion on this. I won a 2015 Nissan Leaf S. The car doesn't always fully turn on with I have my key fob on me. As in, the car turns on, but it won't let me drive. I replaced the batteries on my key fobs and the problem persists. However, after multiple tries, the car does fully turn on and I can drive it.

The terminals in the 12V car battery are a little dirty, so I intend to clean them but I wanted to check with you guys and ask if anyone has a similar experience. Would I need to replace the 12V car battery?

cwerdna
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Location: SF Bay Area, CA

Re: Key fob sometimes worked, sometimes didn't.

Mon Aug 24, 2020 3:37 pm

Sounds like the 12 volt.

Can you measure the voltage of the 12 volt when the car's off in the bad state and/or after it has sat overnight?

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LeftieBiker
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Re: Key fob sometimes worked, sometimes didn't.

Mon Aug 24, 2020 4:10 pm

The key fob only makes it possible to turn the car on. The actual bootup has nothing to do with the fob. I agree that it's likely the 12 volt battery.
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.

cwerdna
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Joined: Fri Jun 03, 2011 4:31 pm
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Re: Key fob sometimes worked, sometimes didn't.

Mon Aug 24, 2020 4:19 pm

If you believe there's a problem w/the fob battery, you could try touching the fob to the power button then pressing the brake pedal + pushing power after hearing the chime. You can even try doing this w/the fob battery removed (yes, I've done this before).

'19 Bolt Premier
'13 Leaf SV w/premium (owned)
'13 Leaf SV w/QC + LED & premium (lease over)

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

brainy19
Posts: 10
Joined: Sun Jun 23, 2019 12:45 am
Delivery Date: 23 Jun 2019

Re: Key fob sometimes worked, sometimes didn't.

Mon Aug 24, 2020 7:01 pm

Measured voltage of battery. 12.55VDC, 0.17mA.

GerryAZ
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Location: Phoenix, AZ

Re: Key fob sometimes worked, sometimes didn't.

Mon Aug 24, 2020 7:32 pm

Your description of the car successfully booting after several tries is consistent with a weak 12V battery because the DC-DC converter will charge the battery a little bit each time the main contactor closes so the voltage eventually becomes high enough for the car to boot correctly. Did you measure the 12.55 volts at the battery terminals after the car had been turned off for some time (say at least 30 minutes)? How did you measure the current? 0.17 mA is way lower than typical power off residual current. If you still have the Nissan OEM 12V battery, I strongly suggest that you replace it with a high-quality AGM deep cycle battery if you plan to keep the car for several years. The OEM 12V batteries failed after less than 3 years in my 2011 and 2015. There are several threads on the forum which explain why a deep cycle AGM battery is a good choice for reliability.
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

LeftieBiker
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Re: Key fob sometimes worked, sometimes didn't.

Mon Aug 24, 2020 8:18 pm

The battery size/configuration is 51R.
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.

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Nubo
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Re: Key fob sometimes worked, sometimes didn't.

Mon Aug 24, 2020 8:35 pm

Dirty or corroded terminals and clamps can definitely cause problems. Get everything clean and tight; you'll want clean connections anyway even if you end up replacing the battery.

A voltage test under little or no load will not always catch a bad battery. Health should be determined by a load test. Some auto parts stores will do this for free -- I have heard Auto Zone does. On the other hand, 5 years is pretty good service from the OEM flooded battery so you wouldn't be leaving much money on the table by just replacing it. An AGM battery will be better than the original and less maintenance.
I noticed you're still working with polymers.

GerryAZ
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Re: Key fob sometimes worked, sometimes didn't.

Mon Aug 24, 2020 9:36 pm

Nubo wrote:
Mon Aug 24, 2020 8:35 pm
Dirty or corroded terminals and clamps can definitely cause problems. Get everything clean and tight; you'll want clean connections anyway even if you end up replacing the battery.

A voltage test under little or no load will not always catch a bad battery. Health should be determined by a load test. Some auto parts stores will do this for free -- I have heard Auto Zone does. On the other hand, 5 years is pretty good service from the OEM flooded battery so you wouldn't be leaving much money on the table by just replacing it. An AGM battery will be better than the original and less maintenance.
Good points--I should have mentioned connections. One thing to watch out for is the body ground connection on the left front fender (looks like a cable clamp in the negative battery cable. I had to remove the bolt (screws directly into body) and clean that connection on my 2015. You can check it with a voltmeter by having the car in ready mode (in Park with brake set for safety). Turn on all electrical accessories you can--HVAC with blower fan on high and high beam headlights should be enough load. Measure the voltage between the negative battery terminal and the body (find another screw or bolt within reach for voltmeter lead)--should not be higher than about 0.1 or 0.2 volts (preferably just a few millivolts).
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

brainy19
Posts: 10
Joined: Sun Jun 23, 2019 12:45 am
Delivery Date: 23 Jun 2019

Re: Key fob sometimes worked, sometimes didn't.

Mon Aug 24, 2020 10:37 pm

Thanks everyone for the advice! I work at home, so I can stay at home for the most part anyways while I work on doing these tests. Load test at Autozone, measuring voltage after the car is off for 30 mins, etc. I'll keep you all posted, hopefully by Wednesday night.

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