E19 error; interior light or auxiliary functions may not operate correctly.

Safety: Disconnect power before working on lighting or wiring.

Steps:

• Check light operation: Open and close the door to see if the interior light responds. If always off or always on, suspect the light circuit.
• Inspect LED module: Remove the light cover and check the LED module for burn marks or discoloration.
• Test door switch: Verify that the door switch operates correctly with a multimeter.
• Replace LED module: If the module is visibly damaged or tests faulty, replace with a Bosch-compatible LED light assembly.
• Control board: If the light and switch are good but E19 persists, the main control board's light driver may be defective and require replacement.