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RadMini Step-Thru error 30 / connector check guide

In the unlikely event you see an error 30 (communication error) on your RadMini Step-Thru, you can perform a connector check to ensure all connectors are secure and in good condition.

Follow the steps below to the connectors on your bike to resolve the issue. This guide uses a RadMini Step-Thru 2, but the steps will be identical for other RadMini Step-Thru models.

Tools Needed:

  • Flat side cutters
  • Flat head screwdriver
  • A camera
  • Zip ties 

The process for checking the connectors below will involve unplugging the connector, inspecting the inside for damage, plugging in the connector, and turning on the bike to check if the error persists while the connector is plugged in.

  1. Get the bike ready for maintenance. Turn off the bike, remove the battery, and press and hold MODE on the LCD display remote to discharge remaining power.
  2. Check the battery and battery mounting tray terminal contacts. Visually inspect the terminal contacts. If they are in good condition, reinstall the battery and turn on the bike to check if the issue is resolved. If the bike will not turn on, remove the battery, discharge remaining power, and check the next connector.
  3. Locate and unplug the connector, starting with the battery connector. Follow the cable from the part to the connector. Snip zip ties for easier access, then pull each side of the connector directly apart without twisting.
    RadMini battery connector.PNG
  4. Inspect the inside of the connector. If the inside of the connector is wet, dirty, or damaged, take a photo and contact Product Support. If the connector looks normal, continue to the next step.
  5. Plug in the connector. If the connector has no visible damage, line up the internal notch and pins (and external indicators) and press directly together without twisting.
  6. Check if the error persists. Reinstall the battery, turn on the bike, and check if the error persists. If the error persists, continue to the next step.
  7. Check the next connector. Turn off the bike, remove the battery, discharge remaining power, and check the next connector.

Repeat these steps with the three connectors listed below; the battery connector, display connector, and wiring harness connector.

Battery Connector

Location: Bottom bracket area

Color: Black inside

Check the connection between the battery and the controller. The battery connector is the large connector located near the bottom bracket. The connector is flat on one side and is black inside with two large prongs.

Display Connector

Location: Handlebar area

Color: Silver metal connector; black inside

To unplug: Untwist the metal portion of the connector, then pull directly apart without twisting.

To reconnect: Align the internal notch and pins on the connector ends, and press directly together, without twisting. Then, twist the metal portions until the connector is secure.

Display connector.png

Wiring Harness Connector

Location: Near seat tube

Color: Black inside

To access the connector:

  1. Turn the handlebar to the side to create cable slack. Feed the wiring harness cable into the opening at the top of the downtube to create cable slack.
  2. Use a flat head screwdriver to carefully unseat the rubber grommet at the bottom of the downtube.
    Wiring harness.png
  3. Unplug, inspect, and reconnect the wiring harness connector. Gently pull the connector out of the downtube and check the connector.
    RadMini Step-Thru wiring harness.png
  4. Insert the connector into the downtube. Carefully push the connector back into the downtube, reinstall the grommet, and check if the issue is resolved.

Follow the steps below to check the remaining connectors.

Note: The process for checking the connectors below will involve unplugging the connector and turning on the bike to check if the error persists while the connector is still unplugged.

  1. Get the bike ready for maintenance. Turn off the bike, remove the battery, and press MODE to discharge remaining power.
  2. Locate and unplug the connector. Follow the cable from the part to the connector. Snip zip ties for easier access, then pull each side of the connector directly apart without twisting.
  3. Inspect the inside of the connector. If the inside of the connector is wet, dirty, or damaged, take a photo and contact Product Support. If the connector looks normal, continue to the next step.
  4. Check if the error persists with the connector unplugged. Leave the connector unplugged. Reinstall the battery, turn on the bike, and check if the error persists. If the error persists, continue to the next step.
    If the error is resolved when the connector is unplugged, the part may need to be replaced. Contact Product Support for more help.
  5. Turn off the bike and plug in the connector. If the error persists, turn off the bike, remove the battery, and discharge remaining power. If the connector has no visible damage, line up the internal notch and pins (and external indicators) and press directly together without twisting.
  6. Repeat steps 1 through 5 on each connector listed below until the error is resolved. Once resolved, replace zip ties and trim to be flush and smooth. Test the bike fully and ride Rad!
Motor Connector

Location: Near the chainstay, on the right side of the bike

Color: Black inside

Motor connector.png

Taillight Connector

Location: Back of the bike

Color: Blue inside

Radmini Step-Thru taillight.png

Second Taillight Connector (Only on a RadMini Step-Thru with a Rear Rack)

Location: on the rear rack

Color: Blue inside

This connector only exists on bikes made in and after 2019 that also have a rear rack installed. Trace the cable from the first taillight connector to the connector plugged into the controller.

Left Brake Connector

Location: Handlebar - rider's left side

Color: Red inside

Trace the cable from the left brake lever to the connector at the front of the bike.

Display connector (1).png

Right Brake Connector

Location: Handlebar - rider's right side

Color: Red inside

Trace the cable from the right brake lever to the connector at the front of the bike.

Display connector (2).png

Throttle Connector

Location: Handlebar area

Color: Yellow inside

Trace the cable from the throttle to the connector at the front of the bike.

Display connector (3).png

Headlight Connector

Location: Front of the bike

Color: Red inside

Trace the cable from the headlight to the connector.

Headlight.png

PAS Sensor Connector

Location: Near the bottom bracket

Color: Yellow inside

Wiring harness.png

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