2018/2019 RadCity Step-Thru Connector Check

A connector check should be performed if the LCD Display shows an “Error 30” code or the bike fails to power on. Checking that all connectors are secure and undamaged can help diagnose electrical issues and make sure your ebike is safe and fun to ride. 

Watch the video and read the instructions below for details on how to perform a connector check on a 2018 or 2019 RadCity Step-Thru.

Warning_-_Transparent.png If you are not confident in your ability to safely and successfully perform all steps, we recommend having the work performed by a local, certified, and reputable bike mechanic.

Gather the tools you will need:

  • Flat side cutters,
  • Digital camera,
  • Flat head screwdriver, and
  • Several replacement zip ties.

Tools.PNG

Click on each heading below and complete the steps within to perform a connector check. Use flat side cutters to snip zip ties as needed to create enough slack to unplug both sides of the connector. 

Warning_-_Transparent.png If you notice any signs of moisture, debris, or damage inside a connector:

  1. Stop the connector check process,
  2. Take clear photos of the damage, and contact Rad Power Bikes Product Support as soon as possible.
Battery and Battery Mounting Tray
  1. Power off the bike, remove the battery, and discharge residual power. Press and release the MODE button on the LCD display remote and use the battery key to turn the battery key barrel to the off-and-unlocked position. Remove the key, rotate the quick release lever out of the way, then remove the battery. On the handlebar, press and release the MODE button to discharge residual power. The display may flash on briefly.

    Warning_-_Transparent.png Do not drop the battery or touch the connector terminals when the battery is removed. 

    Power_off_bike.PNG
  2. Inspect the battery terminal contacts on the mounting tray and on the battery. 

    Battery_and_mounting_tray_-_marked1.png
  3. If everything looks normal, reinstall the battery, ensuring a proper connection. Reposition the seat post quick release lever. Use the key to turn the battery key barrel to the on-and-locked position and attempt to power on the bike to see if the issue is resolved.

If the issue persists, power off the bike, turn off the battery, discharge residual power, and proceed to the next connector.

Display Connector
  1. Trace the cable from the display on the handlebar to the silver metal portion, the display connector.

    display_connector_-_marked.png
  2. Unplug the display connector. Twist each side of the silver metal connector until the threaded portion releases, then pull directly apart without twisting to unplug.

    Inspect_display_connector.PNG
  3. Inspect both sides of the connector. If everything looks normal, reconnect the display connector. Align the internal notch and pins and press directly together without twisting. Then twist only the threaded portions together to fully seat the connection.

    Display_connector.PNG
  4. Turn on the battery and power on the bike to see if the issue is resolved.

If the issue persists, power off the bike, turn off the battery, discharge residual power, and proceed to the next connector.

Brake Connectors
  1. Trace the cable from one brake lever on the handlebar to the connector.

    brake_connectors.png
  2. Unplug the connector. Pull each side of the connector directly apart without twisting.

    brake_connector_-_open.PNG
  3. Inspect both sides of the connector. If everything looks normal, reconnect the brake connector. Align the internal notch and pins (and external arrows) and press directly together without twisting to fully seat the connection.
  4. Turn on the battery and power on the bike to see if the issue is resolved. 
If the issue persists, power off the bike, turn off the battery, discharge residual power, and repeat steps 1 through 4 with the other brake connector before proceeding to the next connector on this list.
Throttle Connector
  1. Trace the cable from the throttle on the handlebar to the connector.

    throttle_connector_-_marked.png
  2. Unplug the connector. Pull each side of the connector directly apart without twisting.

    throttle_connector_-_open.PNG
  3. Inspect both sides of the connector. If everything looks normal, reconnect the throttle connector. Align the internal notch and pins (and external arrows) and press directly together without twisting to fully seat the connection.
  4. Turn on the battery and power on the bike to see if the issue is resolved.

If the issue persists, power off the bike, turn off the battery, discharge residual power, and proceed to the next connector.

Headlight Connector
  1. Trace the cable from the headlight at the front of the bike to the connector.

    headlight_connector.PNG
  2. Unplug the connector. Pull each side of the connector directly apart without twisting.

    headlight_connector_-_open.PNG
  3. Inspect both sides of the connector. If everything looks normal, reconnect the headlight connector. Align the internal notch and pins (and external arrows) and press directly together without twisting to fully seat the connection.
  4. Turn on the battery and power on the bike to see if the issue is resolved.

If the issue persists, power off the bike, turn off the battery, discharge residual power, and proceed to the next connector.

Motor Connector
  1. Trace the cable coming out of the motor, at the chainstay on the bike’s left side, to the connector.

    motor_connector.PNG
  2. Unplug the connector. Pull each side of the connector directly apart without twisting.

    motor_connector_-_open.PNG
  3. Inspect both sides of the connector. If everything looks normal,  reconnect the motor connector. Align the internal notch and pins (and external arrows) and press directly together without twisting to fully seat the connection.
  4. Turn on the battery and power on the bike to see if the issue is resolved.

If the issue persists, power off the bike, turn off the battery, discharge residual power, and proceed to the next connector.

Taillight Connector
  1. Trace the cable coming out of the taillight at the rear of the bike to the connector.
  2. Unplug the connector. Pull each side of the connector directly apart without twisting.

    taillight_connector_-_open.PNG
  3. Inspect both sides of the connector. If everything looks normal, reconnect the taillight connector. Align the internal notch and pins (and external arrows) and press directly together without twisting.
  4. Turn on the battery and power on the bike to see if the issue is resolved. 

If the issue persists, power off the bike, turn off the battery, discharge residual power, and proceed to the next set of instructions below.

The remaining connectors are located at the end of the downtube, and can be accessed from the left (non-drive) side of the bike. Perform a connector check on each of the following connectors.

Battery Connector
  1. Trace the cable coming out of the battery mounting tray to the connector.
  2. Unplug the connector. Pull each side of the connector directly apart without twisting.

    battery_connector.PNG
  3. Inspect both sides of the connector. If everything looks normal, reconnect the battery connector. Align the internal notch and pins (and flat portion) and press directly together without twisting to fully seat the connection.
  4. Turn on the battery and power on the bike to see if the issue is resolved.

If the issue persists, power off the bike, turn off the battery, discharge residual power, and proceed to the next connector.

Pedal Assist (PAS) Sensor Connector
  1. Trace the cable coming out of the PAS sensor, behind the left crank, to the connector.
  2. Unplug the connector. Pull each side of the connector directly apart without twisting.

    PAS_connector.PNG
  3. Inspect both sides of the connector. If everything looks normal, reconnect the PAS sensor connector. Align the internal notch and pins (and external arrows) and press directly together without twisting to fully seat the connection.
  4. Turn on the battery and power on the bike to see if the issue is resolved.

If the issue persists, power off the bike, turn off the battery, discharge residual power, and proceed to the next connector.

Second Taillight Connector
  1. Locate the second taillight connector, which is the same size as the PAS sensor connector. 
  2. Unplug the connector. Pull each side of the connector directly apart without twisting.

    second_taillight_connector_-_open.PNG
  3. Inspect both sides of the connector. If everything looks normal, reconnect the second taillight connector. Align the internal notch and pins (and external arrows) and press directly together without twisting to fully seat the connection.
  4. Turn on the battery and power on the bike to see if the issue is resolved.

If the issue persists, power off the bike, turn off the battery, discharge residual power, and proceed to the next connector.

Wiring Harness Connector
  1. Turn the handlebar to the side. Locate the large wiring harness cable, and gently feed the cable into the opening at the front of the downtube to provide slack.

    Feed_cable_into_opening.PNG
  2. At the lower cable opening on the end of the downtube, use a flat head screwdriver to carefully unseat the rubber grommet. Use caution to not damage the cable housing or scratch the frame.

    unseat_rubber_grommet.PNG
  3. Use caution to avoid unplugging the connector while it is still in the frame, and gently pull the wiring harness cable to move the connector out of the opening.

    wiring_harness_connector.PNG
  4. Unplug the connector. Pull each side of the connector directly apart without twisting.

    wiring_harness_connector_-_open.PNG
  5. Inspect both sides of the connector. If everything looks normal, reconnect the wiring harness connector. Align the internal notch and pins (and external arrows) and press directly together without twisting to fully seat the connection.

    second_taillight_connector.PNG
  6. Turn on the battery and power on the bike to see if the issue is resolved.
  7. Double-check the wiring harness connection is fully secure and passes through the grommet. Insert the connector back into the frame.

    wiring_harness_grommet_-_marked.png
  8. Reinstall the grommet at the cable opening.

    reinstall_grommet.PNG

If the issue persists after checking all connectors, or you find signs of moisture, debris, or damage, contact Rad Power Bikes Product Support.

Once the connector check is complete, replace all zip ties and snip zip tie excess so the cut is flush and there are no sharp points that could damage cable housing. 

Ensure the brake cable and motor connector are secured clear of the rear wheel and that all cables are free from any moving parts.

Contact Rad Power Bikes Product Support if you complete all of the connector check steps and the issue is not resolved.

 

Questions or comments? 

Contact us!

Email: support@radpowerbikes.com

Phone: (800) 939-0310 x 2