[W126 Coupe] Seat belt extenders

[Dick Spellman]

Welcome Rick:

Sounds like circuit # 15 has a dead short somewhere.  You'll have to 
pull each of the power points at each seat belt extender (under the rear 
seat side panels you'll find the harness connections to the extenders) 
and then try inserting the fuse again.  If it still blows, you'll have 
to disconnect the other devices listed on the circuit until you have a 
stable circuit.  Then add one in at at time until you find the fault.  
Where you are new to the coupe, you'll probably have a punch list of 
things to do including your high idle (covered from soup to nuts in 
mbcoupes archives) which may be a matter of a dirty air slider valve 
(the cylinder up front on the engine with two hoses coming out the back 
and an electrical fitting on the front) or possibly a bad solder joint 
on the idle control computer up on the firewall about dead center, black 
and the width of two packs of cigarettes.

I'd start with the high idle and get the engine performing properly 
before tackling the circuit #15.  Do a search on 'high idle' in the 
mbcoupes archives and no doubt others will chime in with a list of do 
and don'ts on the high idle shortly.

High idle, quick check is clamp some of the air hose on the back of the 
slider valve to restrict air flow and see if this tones down the idle, 
then if it does remove the air slider valve and clean it up, try again.  
Also, bench test the solenoid with 12 volts.  Idle control computer, 
remove the pc board from the black case, leave the harness hooked up, 
gently push on the board with a finger here and there to see if the idle 
drops.  If it does get a reman one from The Benz Store for about $150 or so.

Regards,

Dick

WRick11499 at aol.com wrote:

> Hi,My name is Rick and i have just joined this group.
> I have a 1985 500 Sec
> Yesterday when I got in my car and started the car,my seatbelts didn't 
> come forward,so thought it might just be a fuse,checked the fuse box 
> and sure enough a blown fuse # 15 and it said seat B. EX. ,interior 
> lights etc. I got a new fuse and went to beplace the blown one,with 
> the key off and the doors closed( no voltage going to the belts or the 
> interior lights)
> on tring to install the new fuse it burned the crap out of my two 
> fingers.Has anyone had this problem?
> Allso sometimes when starting the car it idles at1800 RPM's after 
> driving for a long time it starts idleing normal .This is hard on the 
> brakes and trans. so don't drive very often.
> M. B. always charged a arm and a leg to fix anything,and other places 
> only made things worse.No one has the hook up for computer 
> dianostics,for a tune up -- etc.
>  Any help would be greatly appreciated    Ricl
>
>------------------------------------------------------------------------
>
>The MB Coupes Website!
>W126 SEC Mailing List
>Postings remain property of MB Coupes, L.L.C.
>