I have the same problem with the car won’t start initially as if the brake pedal was not depressed to turn on to “run” mode without any error message. Then it started but the brake totally failed which scared me so I turned off the car immediately but it won’t start again after multiple trials. Then eventually it displays the warning error message of T/M vehicle system malfunction.
So I thought the brake system failed. But then the electrical system flickers by itself, turning on and off the dashboard lights. Then I know it’s the battery problem, either that terminals were loose or the battery is dying on the last breathe. And eventually the battery was so drained that it couldn’t wind down the window. I was afraid I need to tow it to the dealer to check it out but decided to replace the 12V battery instead.
So I jump started the Leaf with a jumper cable from an ICE car and it turns on without a glitch. Then I drove it to the auto store and they checked the 12V battery and sure enough, the battery is no good. So they replace the battery for me and it runs without any problem.
So it’s the 12V battery not having enough voltage to run the electronics that gives the warning error message and failed to even detect the wireless ignition key.
Thanks you all In this forum, it saves me the towing cost or paying the dealer to work on the car or the brakes when it’s simply a dead battery problem.
Why do they even need a 12V battery to run the lights and electrical system when there’s the lithium battery already? Granted that the voltage may be different but why not get rid of the lead acid battery completely when you have the lithium battery to deliver more power, longevity and stability than the lead acid battery without requiring the cranking power to start the torque motor that’s not like the ICE engine that requires the juice to start the engine when electric motor is self-starting?
It’s easy to use a transformer to match the voltage for the lights and electronic system using the lithium battery without the lead acid battery. I’m surprised the stupid engineers didn’t put an alternator in the Leaf to charge the lead acid battery