Knowledge base
Lights
Possible causes
- Short/open in light or cable
- Incompatible light (too much power, wrong voltage)
Safe test steps
- Does the fault clear with the light unplugged?
- Light cable damage.
Workshop reference values
- Light output voltage and rating are system-specific (manufacturer data).
Repair approach
- Repair cable; use an approved light.
Tools needed
- Digital multimeter (CAT III, fused inputs)
- Basic hand tools, insulated screwdrivers
Safety
- Power down (remove the battery) before unplugging connectors. Never apply pack voltage to data wires.
Related verified fault codes
| Code | Meaning | Component | Reliability |
|---|---|---|---|
| Bosch 502 | Bicycle lighting fault | Lights | Per manufacturer documentation |
| Bosch 550 | Impermissible consumer detected | Lights | Per manufacturer documentation |
| Bafang 23 | Headlight fault | Lights | Per manufacturer documentation |
| Bafang 24 | Headlight sensor fault | Lights | Per manufacturer documentation |