Posts: 78
Joined: Mon Jun 05, 2017 10:21 pm
Delivery Date: 06 Jun 2017

Re: 2012 Leaf Charging Problem

Fri Sep 20, 2019 12:41 pm

i was having a starting problem with failure to go to READY even with jump-starting from a good running car at 14 V.

A weak, old or worn out 12-volt battery can cause issues during charging. There are a multitude of relays and contactors which must be properly sequenced for charging the pack. If the 12V lets go for some reason, then relay contacts can be welded, or arc and frost the contact faces such that they no longer function properly.

There are high currents flowing in the boost transformers of the OBC, and if the current path suddenly goes open circuit, then a high voltage discharge will occur that can damage the diodes and IGBTs of the boost stage located in the epoxy-coated plate bolted to the liquid-cooled heatsink.

i don't know if the FSM has procedures to troubleshoot the main contactors and relays, but worth checking into this.

Good Luck and keep us posted on your findings.

Posts: 20
Joined: Sun Jul 14, 2013 1:16 pm
Delivery Date: 14 Jul 2013
Location: Maryland

Re: 2012 Leaf Charging Problem

Fri Oct 11, 2019 4:35 pm

Finally found and purchased a used 40,000 mile charger off eBay for $500. Installed and car now charges as always.

A learning process. In trying to follow the Service Manual, led me to disassemble a few things which did not need disassembly. All in all it is a doable job for most anyone if one has access to a lift. Six hours from start to finish.

Posts: 2
Joined: Wed Nov 20, 2019 5:22 pm
Delivery Date: 21 Nov 2019
Leaf Number: 021276
Location: SF Bay Area

Re: 2012 Leaf Charging Problem

Fri Nov 22, 2019 10:54 pm

Hi folks - 2012 and I have the same issue as 95eagle - or so it seems.
Been charging with the GE EVSE for about 18 months with no issues. Recently it gave us the red warning light a couple times but after about 4 tries it charged. A few days later - no charging on L2. Tried the factory L1 cord, and same thing: It acts like all is well, but after about 12 seconds, it simply shuts off. DCFC works fine of course.
I get 4.3 V on the prox pin but I get infinite ohms on the pilot wire to ground both ways.
I removed the top circuit board from the OBC, hoping to find a blown diode that was obviously causing the open circuit, but I don't see any obvious damage. Tomorrow I will perform a careful test of the cord from front to back to rule that out.
Anyone have any techniques to share that will enable me to determine what component on the OBC board might be gone? I have a decent meter but no O-scope.
I didn't pay a lot for this car so I would feel a bit nutty dropping a grand on a new OBC - especially from an earlier model - it might be the GE EVSE that caused this issue after all. Is there a way to hack the EVSE to make it not check the prox or pilot wires? Would that cause an overcharge? or simply not charge?
Thanks all!

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