Fault code B1519 – a step-by-step guide to diagnosing and fixing it

Error code B1519 is displayed and the check engine light is on - what does this mean?

The DTC B1519 is a body control module (BCM) fault code that is recognized by the OBD/EOBD systems and typically indicates a problem with the vehicle lighting or electrical components. This trouble code usually refers to faults in the lighting system, particularly in the headlights or interior lighting.

What can cause this fault code?

• Defective headlight bulb or LED unit
• Damaged cable in the lighting circuit
• Loose or corroded plug connections
• Defective light switch or dimmer
• Faulty fuse in the lighting system
• Defective body control module (BCM)
• Short circuit in the wiring
• Defective brightness sensor
• Problems with the vehicle ground

What symptoms occur in parallel with fault code B1519?

• Lighting problems: Headlights or interior lighting not working properly
• Intermittent lighting: Lights flicker or go on and off sporadically
• Complete failure: Certain lighting components do not work at all
• Warning indicators: Additional warning lights in the dashboard come on
• Electrical faults: Other electrical systems may be affected
• Battery problem: Increased power consumption due to faulty components

How can the problem of fault code B1519 be resolved?

• Fixing fault code B1519 requires a systematic diagnosis of the lighting components and electrical connections.
• Checking and replacing defective bulbs or LED units in the affected lighting systems
• Inspection and repair of damaged cables and cleaning of corroded plug connections in the lighting circuit
• Replacing defective fuses and checking the entire fuse box for further damage
• Diagnosis and replacement of the light switch or dimmer if malfunctions are detected
• Checking the vehicle ground and repairing poor ground connections
• Professional diagnosis and, if necessary, replacement of the body control module in the event of more complex faults