To do this you will just need a Phillip's #2 screwdriver

 

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Wiring layouts on each plug: (picture below)

 

Battery supply (red plug connected to red plug)

red to red

Black to black

 

Cadence sensor connection (black plug connected to black plug, with finger release):
Orange to Red
Black to Green
Brown to Black

 

Motor signal wiring (6 pin white plug connected to 6 pin white plug, with finger release):

Black

White

Red

Blue

Green

Yellow

 

Motor power wiring (Clear and green rubber sleeves cover male/female connections):

Green to Green

Yellow to Yellow

Blue to Blue

 

Trunk "3-in-1" cable plug ("Julet" connection - Supplies power/data to the display, headlight, and brake sensors):

Arrows on both plugs need to be aligned when plugging in

 

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How to access the controller:

Remove the lower battery mount cover by unscrewing the two screws circled in picture:

Remove cover by gently grasping the cover by the battery connection points:

 

There will be a little resistance after pulling the battery mount cover out of the way, stop pulling the cover, and instead pull the wiring from the middle of the wiring to avoid damaging connections.

Pull the thicker wiring gently out of the frame (wires are marked with arrows), pulling from a safe point that does not affect plug connections (circled)



As the wiring is pulled gently out of the frame, the controller will start to come out along with the wiring:

Once the controller is removed, begin unplugging connections, matching them to the connections to the new controller, and plugging them in to the new controller as you unplug from the old controller.