Join Date: Jul 2015
Vehicle: 2001 SLK320
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Firstly, how old is the child seat? There will be date stamp on it somewhere, probably moulded into the plastic shell.
If it is over 10 years old, don't use it, as plastic ages and becomes brittle meaning it could fracture in a crash, potentially releasing the harness.
Since all R170 are more than 13 years old, any original Mercedes R170 seat is too old now.
If it is for a toddler it must have a 5 point harness. This is essential to stop the child sliding under the lap belt part in a crash.
4 point harness is no good at all.
Since R170 does not have "IsoFix or LATCH" attachment anchorages, nor a top tether anchorage, the child seat can only be secured with the seatbelt, and the childseat must be a design intended for this mounting type.
Go to the website of the childseat manufacturer, it they are a reputable brand there will be fitting instructions and good practice guildelines there.
Go to you Mercedes dealer. Each main dealer should have at least one person trained in child safety issues and seat fitment.
Go to a specialist child seat shop, they will have someone trained to teach you to fit the seat and inspect it.
Get them to train you to fit it, and inspect it, don't just let them do it and you then leave none the wiser.
For the SLK, the passenger airbag de-activation must be working to safely carry young people in this car.
If you can't get this happening, don't carry people under 12, or smaller than a 5th percentile female, as the interaction with the PAB passenger airbag is more of a concern than not having the airbag.
Hand-me-down or secondhand child seats are to be avoided as the history of them is unknown, and they are often too old.