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Its in the rear headrests. Push the button on the dash to hydraulically raise and lower the roll bar(headrests). It is spring loaded and will pop-up much faster in the event of a roll-over.
Their is no typical up or down adjustment of the rear headrests. A release button is located to the left of the hazard light button directly in front of the shifter. That will make them fold down. You can also remove the headrests. A procedure for that is outlined in your owners manual. Up an down adjustment is not an option though.
Most cars have a button to push/hold at the base of one of the rails to adjust the head rest. Some luxury/newer cars have power headrests.
I'm not sure about your 1989 model but on my 1993 300E the rear headrests are raised manually but lowered by a switch on the dashboard. Since they are both 124 series I would think yours would work the same.
Yes
Check to see if anything restricting movementCheck to see if cable disconnected or brokenSee if you can manually move cable to lower seat
I have this issue with my 97 740iL due to stripped gears in read shade motor, this is how I manually lower the rear shade to clean the window. You need two people or a long stick. First, 1 person in the front seat and one person in the back seat. While pressing the down shade power button help the shade down ... opposite for up again.
Yes, if done manually.
Yes, if done manually.
There is a button near the hazard light button to do that.
The ODO trip button is a small black button on the lower left side of the display shield.
using the I button or on the lower-right corner of the computer screen you will see a + and -. Press the - button