Need to tighten rear view mirror of 1997 Mercedes SL 500. It does not firmly stay positioned, it moves too freely. Failed safety inspection. New one cost $900 from dealer, can find used parts

Question edited for clarity, full make model details.
Question moved from Spanish car maker Seat, (pronounced 'See-At') to make model category.

switch on passenger seat base - MBWorld.org Forums

https://mbworld.org > ... > SL-Class (R129)
Feb 2, 2006 - It's for when you put a baby/car seat in. It keeps the seat belt tensioner in one place after the seat belt is activated.
Seat belt locking in position
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Child Smart Seat for SL ' Mercedes-Benz Forum

https://www.benzworld.org > ... > R129 SL-Class
Jul 10, 2012 - Then there is a button to lock the seat belt of the passenger seat to secure the safety seat on it and deactivate the air bag. That lock button ...
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and lastly

https://www.benzworld.org/threads/child-smart-seat-for-sl.1662040/

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Top needs to be up when top is down the Pistons extend with fluid showing it is low and if you fill at that time when you close it the Pistons will go back in and fluid will run out and possible cause of a leak

Common problem with any brand of car with power headlights. Probably the motor. You could inspect the unit to verify that it moves freely. Check on the Miata forum.

This failure could be the crankshaft position sensor. Overheating or an oil leak through the rear seal can cause it to fail intermittently. My SL500 failed to start after traveling a distance, but after sitting for an hour or so, it suddenly started. Replaced the CPS and all was fine. Also, a dying fuel pump might cause this.

There is a little handle inside the grille on the left just off center about 3/4 way up. pull it out and move it sideways.

Put a sheet metal screw between the mirror and mirror body below the mirror. This will allow the mirror to still break free and swing if you hit something kinda hard, but will keep it from moving freely. There is no other way to tighten it. It's just a case of the spring becoming fatigued.

f

Replacing the rear view mirror on a Ford Explorer is easy. The only obstacle you might encounter is fear of breaking the glued metal plate off the windshield. Do not sweat it. You can buy glues at the auto parts store to reattach the mirror to the windshield (Difficulty: Moderately Easy).

Instructions:

1. Tap gently at the base of the mirror where it slides on over the metal plate glued to the windshield and pull upward. Some rear view mirrors have a small Allen screw that tightens the base of the rear view mirror to the metal plate. Disconnect the electrical plugs if your rear view mirror has them.
2. Pull the rear view mirror clear of the metal plate. Clean around the metal plate glued to the windshield. If the metal plate has come off because of harsh weather or from hammering too hard at it, reattach it with glue designed for this job.
   
3. Clean the area where you will be attaching the metal plate on the windshield. Apply the glue evenly on the surface of the metal plate that will go against the window. Be sure to clean and scrape off all the old glue before applying the new glue. Gently push the metal plate against the windshield in the spot you wanted it and hold tight for five minutes.
   
4. Wait a day before putting the base of the mirror or replacement rear view mirror onto the metal plate. Do not force the base over the plate. Forcing it will likely dislodge it again. Press firmly until it will not slide along the grooves of the metal plate. Reconnect your electrical plugs and tighten the Allen screw if your new mirror has one. Adjust the mirror according to your safe viewing preference
   

Hope help with this (remember rated this help). Good luck.

on the iside of the door theres a plastic cover it just pops off so you can take off the nuts

Point remote at mirror
Press lock/unlock button twice

Within 30 seconds turn ignition to position 2
Should reset if you have no other problems with immobilizer

Car Radio Battery Constant 12v+ Wire: Red/Green
Car Radio Accessory Switched 12v+ Wire: Pink/Yellow/Green
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: Gray/Blue
Car Stereo Antenna Trigger Wire: Blue/White
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: Under right footwell carpet.
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Blue
Left Front Speaker Negative Wire (-): Blue/Brown
Right Front Speaker Positive Wire (+): Yellow
Right Front Speaker Negative Wire (-): Yellow/Brown
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): N/A
Left Rear Speaker Negative Wire (-): N/A
Right Rear Speaker Positive Wire (+): N/A
Right Rear Speaker Negative Wire (-): N/A

pls rate