lorenfb
Posts: 2218
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: LEAF CANbus decoding. (Open discussion)

Sun Jun 16, 2019 11:48 am

JeremyW wrote:It's likely the CAR CAN bus has been removed from the OBD connector, and replaced with a new "diagnostic bus" that talks just to the VCM, which can relay the message onto the requested module by decoding the query address and sending it onward to the appropriate bus where the module is located.


That's basically what's done on most all vehicles since 2005, i.e. using a single CAN bus with a central gateway (CG) that communicates
with the multiple buses (high speed engine/ABS & low speed single-ended comfort control) to access the various vehicle ECUs. Typically the
CG also controls which ECUs are active in the network, e.g. what comfort features the vehicle has installed.
#1 Leaf SL MY 9/13: 74K miles, 48 Ahrs, 5.2 miles/kWh (average), Hx=70, SOH=78, L2 - 100% > 1000, temp < 95F (35C), min discharge (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 115 Ahrs, 5.5 miles/kWh (average), Hx=98, SOH=99, DOD > 25%, temp < 105F

NiallDarwin
Posts: 42
Joined: Thu Jul 09, 2015 1:58 am
Delivery Date: 12 Dec 2015
Leaf Number: 004321
Location: New Zealand

Re: LEAF CANbus decoding. (Open discussion)

Sat Jul 13, 2019 12:26 am

JeremyW wrote:Typically the CG also controls which ECUs are active in the network, e.g. what comfort features the vehicle has installed.

Is this likely to be what decides if options such as Cruise Control are enabled? I tried to upgrade my Leaf to this by simply installing the steering wheel button assembly. There was a connector right there in the wheel for the loom to plug in to. Sadly it wasn't as simple as that. I didn't really think it would be but you never know! :D

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