Seatbelt presenter. - Mercedes-Benz Forum
 
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post #1 of 9 (permalink) Old 03-01-2019, 06:30 AM Thread Starter
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Seatbelt presenter.

If the seat buckle is disconnected under the passenger side seat, would that completely disable the s/belt presenter on my 91 sec ?
My passenger side presenter is inoperable and I donít hear the motor. I did do the reset to no avail.
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post #2 of 9 (permalink) Old 03-02-2019, 09:22 AM
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Quote:
Originally Posted by gogi View Post
If the seat buckle is disconnected under the passenger side seat, would that completely disable the s/belt presenter on my 91 sec ?
My passenger side presenter is inoperable and I don’t hear the motor. I did do the reset to no avail.
Hi there,

On my 91, the right side presenter was totally inop when I got it..

In testing & researching the issue, I found the right side controller unit unplugged, the connector just hanging behind the side panel.. After reconnecting I found the motor would not stop.. Obviously the gear was stripped.. I could not believe someone would go to all that trouble to mask a problem.

If your right side extender has never worked, I might pull the right rear cushion & backrest, then side panel, etc. Of course, if this the case, I think obtaining a replacement gear first might be helpful. I drove my nice 'new' SEC for a week, the interior all half torn apart.. :/

Here are the schematics for you & pdfs should you need fine print

I cannot get that pdf of the passenger side below 1.9MB, our max upload ceiling.


Obviously, if yours at one time functioned normally, its something else..

M.

I sent the PDFs by email...
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91 500SEC EURO Germany
87 560SEC USA 49 State Version

Last edited by MBL87560SEC; 03-03-2019 at 01:40 PM.
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post #3 of 9 (permalink) Old 03-02-2019, 11:01 AM
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I have a spare motor for each side from my 84 500 SEC- I haven’t tested them, but if you wanted to replace, it’s fairly easy to do. Shoot me a DM if you’re interested

1991 560SEC; 145,187 miles
2013 GL550; 99,960 miles

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2009 C300; 95,861 miles (sold)
2006 S430; 101,719 miles (sold)
2001 SL500; 114,032 miles (sold)
1986 560SEL; 150,276 miles (hit by drunk driver)
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post #4 of 9 (permalink) Old 03-03-2019, 03:45 PM
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I agree with MBL87560SEC, best to get the rear cushions out and see what is going on at the control box behind the panel. Take the extender off to see if power is getting to the extender motor as well.
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post #5 of 9 (permalink) Old 03-03-2019, 05:02 PM
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I started to say but then saw that yall were talking about the same model of SEC. I think it was mclare that told be there were 3 different versions of the presenters, GenI, GenII, and 90-91 and that 90-91 were specific with no interchangeability with the other GenII cars

Some days it's just not worth chewing through the restraints
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My Stable:
'91 560SEC "Ursula"
'91 300SE (sold) "Sadie"
'11 Suzuki SX4 Sport Sedan
'02 S-10 Truck
'72 SeaBird boat, "Riff Raft", overhaul restarted

Dif-tor heh smusma
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post #6 of 9 (permalink) Old 03-04-2019, 07:29 AM Thread Starter
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Originally Posted by HardwayMB View Post
I agree with MBL87560SEC, best to get the rear cushions out and see what is going on at the control box behind the panel. Take the extender off to see if power is getting to the extender motor as well.
Jeff I donít think the motor is getting power as I donít hear any noise whatsoever when door is closed. I did check the pin switch in the door jamb and it was fine. The previous owner had told me the presenter sometimes would go crazy in n out, so his mechanic disconnected something.
Iíll probably take things apart when weather warms up, Iíd like to find out what the hell that idiot mechanic disconnected before I proceed. There is no point taking things apart without knowing where the open circuit is. I was wondering if he disconnected the seatbelt buckle,and if he did, how that would affect the circuit.
I would think the only thing that buckle does is tell the arm to retract when seatbelt is fastened, but it may also signal the arm to present when unbuckled. Iím going to take the seat up and see if buckle is indeed disconnected. I think we have one more week of cold before things turn around.
Any thoughts.
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post #7 of 9 (permalink) Old 03-04-2019, 11:44 AM
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You are certainly on the right track Gogi. Best to see what was done before doing anything else. The seat belt buckle also turns off the "fasten seat belt" strobe in the dome light and depending on the wiring configuration, the power to the rear dome light may travel through control control box for the presenter. If the presenter was acting irratic, there is a good chance one of the micro switches on the arm assembly is bad or out of adjustment as they tell the control box when the arm is extended and retracted. Who knows, fixing the presenter may only require plugging the harness back in to the control box and adjusting a micro switch.
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post #8 of 9 (permalink) Old 07-11-2019, 10:24 AM Thread Starter
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Quote:
Originally Posted by MBL87560SEC View Post
Hi there,

On my 91, the right side presenter was totally inop when I got it..

In testing & researching the issue, I found the right side controller unit unplugged, the connector just hanging behind the side panel.. After reconnecting I found the motor would not stop.. Obviously the gear was stripped.. I could not believe someone would go to all that trouble to mask a problem.

If your right side extender has never worked, I might pull the right rear cushion & backrest, then side panel, etc. Of course, if this the case, I think obtaining a replacement gear first might be helpful. I drove my nice 'new' SEC for a week, the interior all half torn apart.. :/

Here are the schematics for you & pdfs should you need fine print

I cannot get that pdf of the passenger side below 1.9MB, our max upload ceiling.


Obviously, if yours at one time functioned normally, its something else..

M.

I sent the PDFs by email...
Well I finally got around to checking my seatbelt extender. It turns out one of the plugs on my controller was unplugged just like yours. Reconnecting the plug made the ext arm go all the way out and the motor keeps running. So I took off the right rear trim panel and found both the plastic gears in very good shape. Removed assembly and examined, everything looked ok,
After making several attempts at adjustment of micro switches I was not able to reverse polarity of the motor or even able to make the extender stop at the end of its travel out. It was a very hot day for me today so after spending an hour or so checking things out I had enough of the heat. So tomorrow I will test all three switches for continuity. If the switchís test ok, I will be lead to believe I need a new controller, which I very much dought.

Any thoughts would be much appreciated. Thanks all.
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post #9 of 9 (permalink) Old 07-12-2019, 08:30 PM Thread Starter
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Update.
Upon further investigation found the control relay for the passenger side belt presenter faulty. Sent pm to bsclifton and also found one on eBay. Waiting for response.
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