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RadRunner and RadExpand error 30 / connector check guide

Use the steps in this article to help you troubleshoot an Error 30 (communication error) on your RadRunner. The article shows a RadRunner 1, but the steps are similar on a RadRunner 2, RadRunner 1 Plus and RadExpand 5. Checking the connectors and ensuring they are secure and undamaged can help diagnose electrical issues and make sure your ebike is safe and fun to ride.

Over time, a connector on your ebike may vibrate loose and need to be plugged in again. If that happens, all Pedal Assist Level lights on the LED display will flash (shown below), or the bike will fail to power on. Performing a connector check can help solve the problem.

RadRunner error code.gif

Overview

The process will require you to power off the bike, turn off the battery, discharge residual power, unplug a connector and inspect it (take photos of any signs of moisture, debris, or damage), carefully plug the connector back in, turn on the battery, and check if the issue is resolved when you power on the bike. Repeat the process for each connector until the issue is resolved.

Tools needed:

  • Flat side cutters to snip zip ties securing the connector cables,
  • A camera to take photos of any moisture, debris, or damage for Rad Power Bikes Product Support,
  • A 4 mm Allen wrench, 
  • An 8 mm wrench, and
  • Around 7 replacement zip ties to secure the cables once the process is complete.

    Tools needed.png

Click on each heading below and follow the instructions within to check each connector.

As you work through the connectors, use flat side cutters to snip zip ties as needed to create enough slack to unplug both sides of the connector.

Battery Check

1. Power off the bike, remove the battery, and discharge residual power by pressing and holding the power button on the LED display until the display remains off (it may flash on briefly).

    Power off bike.png
    Notice: Do not drop the battery or touch/damage the connector terminals when the battery is removed.

2. Inspect the battery terminal contacts on the mounting tray. Take photos of any damage and contact Rad Power Bikes Product Support as soon as possible.

    Inspect terminal battery contacts4.png

If everything looks normal, reinstall the battery, ensuring a proper connection. Use the key to turn on and lock the battery to the frame, 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.

Display Connector

1. Remove the cable cover at the front of the bike and set it aside.

2. Trace the cable from the display on the handlebar to the silver metal display connector.

Display connector3.png

3. Unscrew the silver metal connector until the threaded portion releases, then pull each side directly apart without twisting. Inspect both sides of the connector. If you notice signs of moisture, debris, or damage, take photos to send to Rad Power Bikes Product Support as soon as possible.

Display connector unscrewed.png

4. Reconnect the display connector. Align the internal notch and pins and press directly together without twisting. Then screw the two threaded pieces together to fully seat the connection.

Display connector - Fully seat connection.png

5. 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 at the front of the bike to the connector.

Brake connector2.png

2. Pull each side of the connector directly apart without twisting and inspect both sides of the connector. If you notice signs of moisture, debris, or damage, take photos to send to Rad Power Bikes Product Support as soon as possible. 

Disconnect connector.png

3. 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 at the front of the bike.

Throttle Connector2.png

2. Pull each side of the connector directly apart without twisting and inspect both sides of the connector. If you notice signs of moisture, debris, or damage, take photos to send to Rad Power Bikes Product Support as soon as possible.

Throttle connector.png

3. 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 connector1.png

2. Pull each side of the connector directly apart without twisting and inspect both sides of the connector. If you notice signs of moisture, debris, or damage, take photos to send to Rad Power Bikes Product Support as soon as possible.

Reconnect.png

3. 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 connector1.png

2. Pull each side of the connector directly apart without twisting and inspect both sides of the connector. If you notice signs of moisture, debris, or damage, take photos to send to Rad Power Bikes Product Support as soon as possible.

Open connector.png

3. 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.

Taillight connector1.png

2. Pull each side of the connector directly apart without twisting and inspect both sides of the connector. If you notice signs of moisture, debris, or damage, take photos to send to Rad Power Bikes Product Support as soon as possible.

3. Reconnect the 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 read the instructions below on how to proceed to the next connector.

The remaining connectors are located below the battery, between the battery mounting tray (on the seat tube) and the skid plate (under the cranks at the bottom of the frame). On the RadExpand 5, the controller is mounted to the back of the seat tube with the connectors directly underneath it. To access these connectors, unlock and remove the battery, discharge residual power, and follow the instructions within each section below.

Remove the Skid Plate

1. Remove the skid plate mounting bolts and hardware:

a) Remove the rear skid plate mounting bolt, locknut, washer, and spacer. Use a 4 mm Allen wrench from the top and an 8 mm wrench on the locknut under the skid plate (near the kickstand).

Skid plate tools.png

b) Remove the front skid plate mounting bolt, spacer, flat washer, and split washer. Insert a 4 mm Allen wrench into the bolt head fully from below the skid plate (near the bent end). Apply constant pressure and turn the wrench slowly to prevent stripping the bolt head.

Bent end of skid plate.png

Battery Connector

1. Trace the cable coming out of the battery to the connector.

2. Pull each side of the connector directly apart without twisting and inspect both sides of the connector. If you notice signs of moisture, debris, or damage, take photos to send to Rad Power Bikes Product Support as soon as possible.

RadRunner battery connector.gif

3. 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 to the connector.

PAS and Connector1.png

2. Pull each side of the connector directly apart without twisting and inspect both sides of the connector. If you notice signs of moisture, debris, or damage, take photos to send to Rad Power Bikes Product Support as soon as possible.

PAS connector open.png

3. 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.

Second Taillight Connector2.png

2. Pull each side of the connector directly apart without twisting and inspect both sides of the connector. If you notice signs of moisture, debris, or damage, take photos to send to Rad Power Bikes Product Support as soon as possible.

Open tailllight connector.png

3. 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.

Downtube.png

2. Unseat the rubber grommet, which is located at the lower cable opening in front of the bottom bracket.

Rubber grommet1.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.

Connector.png

4. Pull each side directly apart without twisting and inspect both sides of the connector. If you notice signs of moisture, debris, or damage, take photos to send to Rad Power Bikes Product Support as soon as possible.

Open connector.png

5. 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.

6. Turn on the battery and power on the bike to see if the issue is resolved.

If the issue persists after checking all 10 connectors, or you find signs of moisture, debris, or damage, contact Rad Power Bikes Product Support.

If the connector disconnects inside of the downtube:

  1. Remove the grommet on the upper cable opening and pull the wiring harness out of the downtube fully.
  2. Pull the cable and top half of the connector out of the cable opening in the frame.
  3. Tie the string to the top half of the connector end and tape it to keep it secure. Insert the string and connector end into the upper cable opening. Use the cable to help move the string through the downtube and out of the lower cable opening.
  4. Pull the string at the bottom of the downtube to pass the connector end through the downtube, out of the lower cable opening, and access the connector.
  5. Remove the tape, untie the string, and check the connector.
Reinstall the Skid Plate

1. Replace any zip ties that were removed and use flat side cutters to snip off zip tie excess. Ensure the cut is flush and there are no sharp points that could damage cable housing.

2. Reinstall the skid plate starting with the rear bolt near the kickstand. Ensure the cables are properly oriented to afford clearance. 

a) Pass the rear skid plate mounting bolt down through the kickstand mounting plate and spacer. Pass the bolt through the skid plate, pass a flat washer onto the bolt end, and thread on the locknut while holding the bolt in place with a 4 mm Allen wrench.

b) Pass the split washer and flat washer onto the front skid plate mounting bolt endPass the bolt up through the front of the skid mounting plate and spacer, and carefully thread into the mounting point on the frame, tightening partway (about 3-4 turns).

c) Tighten both bolts evenly by alternating between them every few turns. Use a 4 mm Allen wrench to hold the back bolt in place, and an 8 mm wrench to tighten down the locknut. Use a 4 mm Allen wrench at the front of the bolt. Torque both bolts to 5 Nm.

Once the connector check is complete, replace all zip ties snipped during the check, snip zip tie excess, and check that all cables are free from any moving parts. Reinstall the cable cover at the front of the bike.

If the issue persists after completing the connector check, contact Rad Power Bikes Product Support.

 

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