Mercedes-Benz Rear Left Right Seat Backrest Not Locked Explained

Mercedes Benz cars are equipped with all the latest features and technological advancements which are aimed at providing luxury and comfort to the driver and passengers. When any of those features undergo a problem, the convenience it offers is snatched. The center and outer backrests can be folded forwards separately and sometimes Mercedes-Benz Rear Left Right seat backrest not locked is a common issue for all Mercedes-Benz cars which have folding rear seats indicated with a warning message received on your instrument cluster. No warning message should be ignored for keeping your car in an ideal condition. There is a risk of injury if the rear bench seat and backrest are not engaged therefore this warning message should be attended to promptly to avoid any further problems.

What Does This Error Mean?

This error simply means that the rear seat backrest was released and not folded down for some reason. It may be due to not being fixed into place and is loose or either latch or locking system has failed. There is a possibility that something has broken in the mechanism of the locking system preventing it to become locked. The mechanism of folding seat latches underneath the seat and any undue pressure might cause damage to any of the parts of the lock causing the seat backrest impossible to lock. It’s not necessary that something has broken inside, the lock may have been moved from its place and the seat backrest could not be locked.

Before, trying to go deep inside, first, you need to diagnose actually what happened, a breakage or displacement.

Diagnosis Of Fault

As an initial check and to identify the actual fault just once try to push the latch with some pressure; it should fix into the place with that pressure if it has been displaced and the error should go off. Indeed, pushing too hard will just break the mechanism so avoid pressing too much. If it doesn’t fix into its place then keep investigating because you may find some faulty parts inside the system. To do further investigation, you need to open and remove the side panel that you will find underneath the seat. Unbolt the screws and take the locking system out to properly investigating if any piece of lock is broken inside.

How to Fix This Error?

In case if you find that the problem is just the displacement of locking system then you can try to bring it back into its place through this procedure.

From outside the car, move the seat into the full easy entry position by pressing down the outboard lever and sliding the seat into the full forward position. The easy entry position is the home position for the inboard and outboard backrest latch mechanisms.
Sit in the other front seat, pull up on the inboard operating lever of the seat being worked on, and move the backrest to the fully reclined position before releasing the lever.
The backrest should now move to the desired position and latch in place when the inboard lever is operated.

And if the problem is something broken, then you might need to get a new locking system installed if the breakage caused can’t be repaired. In most of cases, repairing the broken parts is tricky because it’s all plastic inside and a minor mistake could cause a major fault. In such a case, you will need to replace the existing locking system with a new one.

If fortunately, you’ve got some DIY experience and the confidence to check and fix the technical issues, you can attempt to fix it at home otherwise you need to bring the vehicle to a mechanic shop for a professional fix.

If you wish to fix the out of synchronization mechanism of the rear seat backrest at home then following this procedure would help you fix this issue.