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Old 02-24-2001, 01:56 PM
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MBenzNL MBenzNL is offline
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417

The blue vacuum lines go to an electric controlled switch under the (left side of the) rear seats.
If this switch is broken, the seats will not be locked either (since you said both seats stopped locking simultaneously...).
This is easy to check (the rear seat can be taken out without any tools).

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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