Mercedes-Benz GL-Class 2012 Owners Manual - Manual (Page 241)

Display messages Possible causes/consequences and M Solutions
X Visit a qualified specialist workshop immediately.
G WARNING
If the 42 indicator lamp remains off even after performing the above corrective
steps, do not have any children 12 years old and under and other small individuals use the front-
passenger seat until the system has been repaired.
Display messages
239
On-board computer and displays
Z