Battery level indicator stopped working and the motor too

[Hunza]

I have a bicycle with a BMSB 20A sine wave controller, S-LCD3, and a 48V 11.6Ah Bottle-09 Panasonic Battery. The bicycle's LCD no longer shows a load level indicator, and the motor is not functioning at all, despite the fact that the battery is fully charged and works well on another bicycle. Any idea what could be the reason for this?

 

[E-HP]

Set P5 to 0 and check the actual voltage the display is seeing.

 

[99t4]

Explain "load level indicator." Could that be the current reading?

 

[docw009]

I've seen this on my LCD3 display once. The display isn't getting any data from the controller, and even though it has access to the battery and the LCD3 can show voltage, the icon is blank. In my case the Rxd line in the display connector had broken, However, the throttle still worked, so the motor worked. So I am suspicious of your controller.

Inspect the connector. See if walk mode works. Maybe check the throttle and PAS sensor voltage. Should be 4.5V.

If the other bike is also an LCD3 and S06 controller, swap the displays, You might even try connecting the non-working motor to the other ebike. You don't have to remove wheels if they use the same connector. This may risk damaging parts, but I do it on my bikes when a motor won;t work. It's always been a bad controller, which is why I keep a spare.

 

[d8veh]

Yes, it's a comms problem. The LCD works independently from the controller, so the controller could be unpowered or there could be a problem on the 5v somewhere or a connection fault or water in the LCD, or a comms wire pulled off. Either way, the first thing to check is the 5v on any connector you can - motor halls, throttle, PAS, speed sensor.

If there's no 5v or it's too low, disconnect everything except the battery and LCD, and see what happens.

If it's a new replacement LCD, then check the comms protocol setting.

 

[Hunza]

Setting P5 to zero resulted in a 'full battery' indication...

The problem persisted despite:

• Switching the controller
• Switching the motor (to the one from the other bicycle)
• Switching the KT-LCD3..after the splitter (to the one from the other bicycle)

Finally, I ended up switching the 1T4 cable... problem solved!

Thank you very much for your help.