The B1350 code on your 2020 Mercedes-Benz GLC indicates a fault in the left side mirror motor circuit. This code affects your GLC's power mirror adjustment system, signaling an electrical issue with the driver's side mirror motors.
Understanding B1350 on Mercedes-Benz GLC
Power mirrors contain multiple motors - typically for up/down, left/right movement, and possibly folding. The mirror control module monitors these circuits. Code B1350 indicates a detected fault in one or more of the left mirror motor circuits.
Common Symptoms
- Left mirror won't adjust
- Mirror adjusts in one direction only
- Mirror adjustment is slow or jerky
- Auto-tilt in reverse doesn't work
- Mirror fold function inoperative
- Memory mirror positions not working
Primary Causes
- Mirror adjustment motor failure
- Mirror fold motor failure (if equipped)
- Wiring damage in door
- Mirror switch failure
- Mirror glass assembly fault
- SAM (signal acquisition module) issue
Diagnostic Procedure for 2020 GLC
Using Mercedes-Benz Star Diagnostic, command mirror movements individually. Listen for motor operation in each direction. Check for voltage at mirror connector when commanded. Test mirror switch inputs to SAM. Inspect wiring in door, especially at jamb. Check mirror glass assembly motor connections if glass is separate.
Repair Solutions
Replace failed mirror motor or complete mirror assembly if motors are integrated. Repair wiring damage in door. Replace faulty mirror switch. If mirror glass has integrated motors, glass assembly replacement may be needed. Clear codes after repair and verify all mirror adjustments and features work.