RadExpand 5 Plus (2024) error 30 / connector check guide

Use this procedure to check the cable connections on your RadExpand 5 Plus that may be causing electrical error messages or preventing the bike from powering on. This procedure will require you to power down your ebike, unplug individual cables and inspect them for damage, then carefully reconnect them and power on the ebike to see if that resolved the issue. Repeat the process with each cable until the issue is resolved, or you isolate the problem to a specific component. 

Tools needed:

• Flathead screwdriver
• Flat-side cutters
• Replacement zip ties
• Bike stand (optional)
• Nitrile gloves (optional)

1. Get the ebike ready for maintenance. Turn off the ebike, remove the battery, and press and hold the power button to discharge any remaining power.
2. Inspect the battery and battery mount terminal contacts. If the contacts are damaged, dirty, or wet, the part may need to be replaced. Take a photo and contact Customer Support for help. If the contacts are in good condition, set the battery aside for now.
3. Inspect the main cables. The Color Display, Battery and Wiring Harness cables are the first ones to check, as if any of these cables are damaged or disconnected, your ebike will not power on. 
   • Unplug each of the following cables (see diagram) one at a time. Snip any nearby zip ties if you need cable slack, and pull each side of the connector apart, without twisting, to unplug.
     • Color Display 
     • Remote (Connected to back of Color Display)
     • Battery Tray Connector (Use 4 mm Allen wrench to remove the battery tray. Connector is located in downtube opening.)
     • Wiring Harness (Connector is located in downtube opening.)
   • Inspect the inside of the connector. If the inside is damaged, dirty, or wet, the part may need to be replaced. Take a photo and contact Customer Support for help.
   • Plug the connector back in, reinstall the battery, turn the bike on, and check whether the error is resolved. Repeat the process for each cable to try and isolate the source of the error.
   •  If these cables are not the source of the error, continue to the next step.
4. Inspect the remaining cable connections. If the error continues, continue troubleshooting to  isolate the part that may be causing the error. The process for checking the connectors below will involve unplugging the connector and turning on the ebike on to check if the error continues while the connector is still unplugged. 
   • Unplug each of the following cables (see diagram) one at a time. Snip any nearby zip ties if you need cable slack, and pull each side of the connector apart, without twisting, to unplug.
     • Front brake sensor
     • Rear brake sensor
     • Throttle
     • PAS
     • Motor (mounted on chain stay)
     • Headlight
     • Taillight (two connectors mounted on rear rack)
   • Inspect the inside of the connector. If the inside is damaged, dirty, or wet, the part may need to be replaced. Take a photo and contact Product Support for help.
   • Leave the connector unplugged, reinstall the battery, turn the bike on, and check whether the error is resolved. Repeat the process for each cable to try and isolate the source of the error.
   • If the issue persists after checking all cable connections, contact Rad Power Bikes Customer Support.
5. Return cables to original positions. Carefully return cables to their original positions and replace any zip ties. Use flat-side cutters to snip off zip tie excess, and ensure the cut is flush and smooth with no sharp point. Check that all cables are out of the way of moving parts, and turn the handlebar to ensure that it can move freely.
6. Reinstall the battery, test the bike fully, and ride Rad!