I'd first suspect the relay which controls the arm, there is one on each side kind of behind the rear most end of the arm assembly. If you pop out the seat backs you'll see a bit of it. I took off the rear interior side panels to replace them.

 

Fixed. I took out fuse # 15 for 30 seconds (which is for the driver's side). The retractor is now working perfectly. For others with problems with the passenger side the fuse is #8. I would definitely recommend removal of the fuse(s) first if there are issues. Removal for about 30 seconds resets the control module.

 

This is very interesting. Are there any other fuses in any other W126s, (any model; especially a 1982 380SEC) that reset any other parts/systems the way this one did? When I bought my 380 I replaced all fuses, so there was ample time per fuse for a reset if that was going to happen.

 

I have 6 sets if anyone needs a spare set.

 

Perhaps there was corrosion or crud at the fuse and removal cleaned the contact? Kind of like when the batteries in a TV remote are getting old and it won't work until you remove the cover and spin them a few times in their slots. I guess it knocks a zillionth of an inch of something off the battery contact and restores power. Short term fix. I spend too much time in hotels and have probably restored remotes 50 times with this trick over the years.

 

No, sometimes they get jammed and overload the relay. It says in the service manual very clearly that if they don't work, to pull fuse 7 for 30 seconds as he did to reset them. He did the correct procedure.

 

Yeah I'd completely forgotten about that reset.

 

1988 560sec

Hey guys I couldn't find an exact match to my problem in the forum so my apologies if this has been asked before. On the driver's seat belt arm once you put the key in the ignition the arm continuously goes in and out repeatedly 6 to 10 times before it stops.

Any ideas and thank you for your help.

 

Hey guys I couldn't find an exact match to my problem in the forum so my apologies if this has been asked before. On the driver's seat belt arm once you put the key in the ignition the arm continuously goes in and out repeatedly 6 to 10 times before it stops.

Any ideas and thank you for your help.

Mine does this on occasion, too. My understanding is there are is a microswitch on the mechanism that tells the arm when to stop. If it isn't reaching that switch when it extends, it won't stop in the extended position and will keep repeating.

I find that if I grab the belt just before full extension to reduce the strain on the arm, it will stay in the extended position.

 

Thanks so much and I will give it a try. Have a great week.

 

I think Mclare did a post regarding the micro switches, might be worth a search.

 

Thanks and I will search for his post.

 

While this thread has bee revived . . . . . the passenger presenter on my 560 has been disconnected (per maintenance paperwork the PO had done) due to repair parts NLA. I don't know if the presenters on the 500 are operational, assuming the passenger one is due to belt being hooked up as if someone was in the seat. Are the GenI and GenII similar enough to use parts from it ? If not I have a pair I'll put on the for sale thread

 

I wonder if they couldn't find the gears or something. They are available though I thought.

 

I don't know exactly what is wrong with it, just what was in the paperwork the PO was having trouble with the extender motor staying engaged (??) and was running the battery down and it was disconnected due to "parts NLA" I haven't taken it apart because it's not a critical issue but if the assemblies are similar to the GenI I'll pull those presenters

 

Thanks for the ideas. I'll look at it this weekend and see what options I have.

Thanks again

 

As Bruce and Ian have said, there are micro switches that set the fore and aft travel limits, and there is a little plastic tab that engages the switches. Check to see if that is missing first.

My right side sometimes does that too, once in a while.

 

Bruce, I have spare presenter arms, like a dozen of them if you need one. LMK.

Gen I and Gen II's are different and even late Gen II's are completely different to anything earlier. They changed them to a completely different type of connector in 90 I think.

 

Bruce, If it's for your '91, I don't have any '91 presenters. Only the two in my car, sorry.

 

That's ok Mike, I appreciate the offer but I don't want to take away from your fine ride :devil (J/K) It was the thought that counts. I didn't know if they cross fit and like you said (I didn't know either) they even upgraded the upgrade. This isn't a critical nor safety item so it'll go down my list