What does the Main beam warning light mean?

Main beam headlights are on. Dip for oncoming traffic. Not a fault.

Can I drive with the Main beam light on?

Usually informational — confirm in the handbook that it is not also used as a fault lamp on your model.

Blue · Info / system on

Main beam warning light — what it means

Main beam headlights are on. On most UK cars this shows as a blue tell-tale. Urgency: Info / system on. Symbols vary by brand — confirm the exact icon in your handbook.

Also called: main beam, high beam

What it means

Main beam headlights are on.

What to do first: Dip for oncoming traffic. Not a fault.

Common causes

A genuine main beam system fault
A failed sensor or switch reporting a false warning
Low voltage after a weak 12V battery (can set multiple lamps)
Recent work (battery change, wheels, sensors) that needs a reset or calibration

Step-by-step

1Dip for oncoming traffic. Not a fault.
2Photograph the light and any message-centre text for the garage or breakdown operator.
3Note whether the car feels normal — power loss, smoke, smells or strange noises change the priority.
4Avoid clearing codes repeatedly without fixing the cause; the fault will return and can fail an MOT.

MOT note

Informational lights (green/blue) are not faults. Amber faults should still be diagnosed promptly.

FAQs

What does the Main beam warning light mean?: Main beam headlights are on. Dip for oncoming traffic. Not a fault.
Can I drive with the Main beam light on?: Usually informational — confirm in the handbook that it is not also used as a fault lamp on your model.

Other warning lights

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Icons from Wikimedia Commons dashboard tell-tales / ISO 7000. Manufacturer artwork varies — your handbook wins.