B0490
Display Backlight Circuit
The infotainment or instrument cluster module has detected a fault in the display backlight circuit. The display may stay dark or be unreadable in low light.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Common causes
Ordered by how often each turns out to be the cause.
- Backlight LEDs or inverter failedCommon
- Display module internal faultPossible
Parts involved
- Display Module
- Backlight Circuit
B0490 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.