Bafang mid drive BBS02 Throttle Stopped Working?

[Elliotbike]

The throttle just stopped working, pedal assist works perfect, No Codes, I replaced the throttle and controller.. IM LOST ON THIS ONE!

 

[Gionnirocket]

Test/replace the 1to4 main harness cable. Check for bent pins.

 

[Elliotbike]

I thought that was the problem too so I just installed my new 4 to 1 cable but nothing changed. The throttle still doesn’t work. This is frustrating, my motor probably has 75 miles on it.

 

[harryS]

Check the throttle connector. See if you get
red-black 4.5V
blue-black 0V
blue-red 4.0V

These are I recently got on a hubmotor controller, but I think the circuits are similar. Too lazy to go check my BS02B.

 

[Elliotbike]

I’ll try today, are you using the motor as ground?

 

[Elliotbike]

I just tried all three prongs, and I got zero volts

 

[Gionnirocket]

I just tried all three prongs, and I got zero volts

I don’t belive the motor is bonded negative so you would need to read voltage between pins.
Check the pins at the controller, and then at the end of the 1T4 harness.

 

[harryS]

Hmm. Check it at the main harness too,

 

[Elliotbike]

Check the throttle connector. See if you get
red-black 4.5V
blue-black 0V
blue-red 4.0V

These are I recently got on a hubmotor controller, but I think the circuits are similar. Too lazy to go check my BS02B.

I'm getting 5.07 volts on the Blue/Red & Red/Black

 

[Elliotbike]

Hmm. Check it at the main harness too,

So far, I've replaced the Throttle, Main harness, Controller and display.. no change from the original equipment? I think it might be the motors internal wiring.. nothing is left to check?

 

[Gionnirocket]

I believe you should have 5v between pins 6 ( + ) and 8 ( - ) and 0v on pin 7 with the throttle disconnected.
With the throttle connected you should now have approximately 1v at rest and rising to about 4v when fully rotated between pins 7 and 8
This all should be handled by the controller

Post some pics of your install and a screenshot of the throttle settings