Bosch Purion: turn the lights on and off, always-on lights
The Purion has a dedicated light button. Whether the lights can be switched off at all depends on how the bike manufacturer configured the drive unit. No app involved.
Step by step
- Switch the bike on.
- Press the light button (bulb icon) on the Purion. A light symbol appears at the top of the screen and the display backlight comes on.
- Press the light button again to switch the lights off.
- If the lights come on with the bike and the button does nothing, the bike is configured for always-on lights (common on city bikes in NL/DE/DK). That is set in DiagnosticTool by the dealer, not in a Purion menu.
- Lights that flicker or fail while the symbol is on are a wiring or lamp fault, not a setting.
Can't find it?
The Purion has no 'auto' light mode of its own; automatic (sensor-based) lighting is a feature of certain lamps and of the Smart System. If the light button prints an error code, look that code up on our error-code pages.
Frequently asked
Can I set the Purion lights to switch on automatically?
Not from the Purion. Always-on is a dealer setting; light-sensor automatic switching needs a lamp that supports it.
Why do my lights stay on even when I press the button?
The manufacturer configured always-on lighting for your market; a dealer can change it in DiagnosticTool if the local rules allow.
Do the lights run from the main battery?
Yes, on a Bosch system the lamps are powered by the drive unit from the main battery.
Manuals and video
- Bosch eBike Help Center: official error-code index
- Bosch eBike downloads: quick start guides and battery guide
- Bosch eBike dealer search (DiagnosticTool readout)
Videos found on YouTube and checked automatically; they are other people's work, not ours.
- How To Turn The Lights On With A Bosch Purion E-Bike On Yer Bike Cycles