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Re: how to increase the seatbelt pre-tension...2004 f350.
REMOVE THE COVER AND WD-4O THE MECHANISM.THE TENSION IS SET BY A MANUFACTURING PROCESS THAT YOU CANT INCREASE.ALSO IT COULD BE DEADLY TRYING TO DUE TO THE PRESET ACCIDENT LOCKING FEATURE,TRY WD-40 /IF IT WORKS GREAT IF NOT TRY A SALVAGE YARD/NEW PARTS STORE.
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If you have a heavy enough object sitting in the passenger seat, the sensor may think a person is sitting there without a seatbelt on....or in a case that I ran into a few years back, a small coin had lodged inside my locking side seat belt. The side with the release button. Or lastly, have you vacuumed your car recently? You may have unplugged your seatbelt sensor wires while vacuuming.
Your car is getting up in age too, so check to see if the retracting spring is still pulling the seatbelt back into its holster, check the general condition of your locks on the belts....not sure if there is a fuse link for a seatbelt system in your car...but you could check your owners manual to see if there is, and while in the manual...check for reasons the seatbelt light comes on too. You can get a copy of your owners manual on line from Nissan or a aftermarket source. Good luck and sorry I couldn't be more specific. Your owners manual or an on line search of the trouble code and the specific working generated by the readout will give some information I'm sure....Work safely please. and beware of air bags when messing with seat safety issues. If you deploy an air bag on yourself while messing with the safety controls.....you could be killed or injured....so be careful.
There should be a mechanism in the door jamb near-to the seatbelt. If equipped, push on it while jerking seatbelt until it retracts. If not equipped, close door firmly while jerking seatbelt to activate retract.
When a seatbelt locks up it is usually due to dirt or corrosion in the automatic locking mechanism. The mechanism can't release because it is under tension. If you get into the cover that houses the release mechanism for the seatbelt, you may be able to hit it with a little wd-40. You do have to release that tension so that the lock will spring back to the open position and allow the seatbelt to retract. Try the lube. Sometimes the galvanized coating on the internal parts causes a seize.
TO get that screw out you need to use a tool that looks like a nail puller and you put it under the screw head to lift while you unscrew it. Once you get to the mechanism for the seatbelt, you should be able to free it because it will he able to have slack and the dogs will loosen up. Be mindful of airbags and seatbelt tensioners that are in that area though
inside your seatbelts there are small explosives known as pre-tensioners, when you crash these pre tensioners go off and pull you back into the seat as part of the SRS( supplemented restraint system) which means that aswel as new airbags you also need new seatbelts for your car.
will have to take the side panel off where the belt is located make sure no twists are present. if not pull it hard and see if it retracts, if it still does not retract you may have to replace the unit. the retraction spring in the unit is broken, or the lock mechanism has failed.
Inertia reels get stuck permanantly if pulled out suddenly over time or after an accident. You may be able to remove it or pull lightly out with little tension and tap on it, if not you may need to replace the inertia reel.