Ambient Interior Lighting Circuit Malfunction
The B0057 code means the vehicle's onboard diagnostic system has detected: Ambient Interior Lighting Circuit Malfunction. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $50 - $400 (parts and labor)
Basic scanners skip body codes entirely. BlueDriver reads airbag, HVAC, lighting, and BCM codes through your phone.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Ambient lighting in cabin not working
- Interior accent lights stuck on one color
- Ambient light color selection not responding
- Footwell or door panel lighting not illuminating
- Ambient lighting flickers or turns off randomly
Probable Causes (Ranked by Likelihood)
- Failed ambient light LED strip or module Very High
- Faulty ambient lighting control module High
- Loose connector at ambient light strip Moderate
- Body control module ambient lighting output failure Low
Step-by-Step Diagnostic Procedure
-
Check ambient light settings in vehicle infotainment system
-
Inspect visible LED strip connections at door panels and footwell
-
Scan body control module for ambient light DTCs
-
Test power supply at ambient light modules
-
Check communication between infotainment and lighting modules
Common Fixes by Vehicle
What techs usually find when diagnosing B0057 on specific vehicles — tap your vehicle for the fix and the exact part:
2007-2017 Toyota Camry/Corolla easy DIY
B0057 on Toyotas is almost always the passenger seat belt buckle switch. The switch tells the SRS whether the belt is latched. It is integrated into the buckle itself -- you cannot replace the switch separately. Pull the seat forward, disconnect the battery, remove the seat belt anchor bolt and buckle bolt, then swap the full buckle assembly. Clear codes with a scan tool.
Labor: 30-60 min2008-2015 Toyota Sienna easy DIY
Sienna B0057 often appears when a child seat latch plate gets jammed into the buckle. Pop open the buckle with a small flathead screwdriver and fish out the debris. If the switch is damaged from the jam, the buckle assembly needs replacement. Sienna has bench seats in some trim levels -- verify which row is triggering the code with TechStream or a bidirectional scanner.
Labor: 45-60 min2012-2020 Toyota Tacoma easy DIY
Tacoma passenger buckle codes are frequently caused by coin or gravel intrusion -- the buckle faces up and catches everything. Blow it out with compressed air and work the button 20-30 times. If the airbag light stays on, the switch is worn and the buckle must be replaced. Toyota part numbers differ by trim; verify VIN before ordering.
Labor: 30-45 minFrequently Asked Questions
What is ambient interior lighting?
Ambient lighting uses LED strips or modules to provide soft accent illumination inside the cabin, typically in footwells, door panels, and the dashboard area. It is primarily an aesthetic feature.
Can ambient lighting be added aftermarket?
Yes. Aftermarket LED strip kits are widely available and can be installed with basic tools. However, aftermarket kits may not integrate with the factory lighting controls.
Will this affect any safety features?
No. Ambient interior lighting is purely cosmetic and does not affect any safety systems, driving controls, or essential vehicle functions.
Sources
This page is built from documented references. Verify against your own service info before repair work.
See All Codes & Fixes for Your Vehicle
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.