Hi guys, forgive me if I’ve done this wrong as I’m rusty with the forum.

I wanted to ask if anyone knows which fuse is for the belt pre-tensioners. As the title says the seatbelt light is on. What I have found is the passenger side clicks by the belt roller in the back of the car by the rear seat (lower interior body panel) but the drivers belt doesn’t.

So I’m trying to eliminate a fuse for that before I have to tear the back of the car apart and try to test power to it, I took the belt insertion part attached to the seat apart and the switch is clicking so no fries or sticky werthers sweets in there, every fuse panel I’ve tried to find except a U.S. one doesn’t show a fuse for them so is it only one fuse for both ?? If so am I looking at pre-tensioner failure ?

Any help would be grateful bearing in mind I’m a fussy swine and don’t want to pull the bulb out of the dash ☺️ As that seems like I’m ignoring the problem. My car is 1995 Jap import. Thanks ?

I thought the seat belt light just shows you havnt plugged the belt in. Direct conection from light to switch, via seat connector under seat

I thought the seat belt light just shows you havnt plugged the belt in. Direct conection from light to switch, via seat connector under seat

 

As I understand it, the wires got to energising the pre-tensioner which then sends a signal to the light, it would seem odd that I hear a click on passenger side and not on drivers side and the light is on?

Some confusion here, so to clarify, modern seat belt pre-tensioners fit on the seat base, they have a small charge in a tube shape unit and form part of the belt latch, see the example picture below.

 

 

In the event the forward sensor detects a crash the charge is activated, this pulls the seat belt tighter, it also opens a circuit, that circuit forms parts of the air bag system, if the one time only pre-tensioner has activated the airbag light will be activated not the seat belt light, its also means the unit cannot be used again.

 

 

Nissan seat belt latch above, as you can see no tensioner charge unit fitted

 

The 300zx does not have these type of seat belt pre-tensioner, the seat belt latch only activates a switch, this controls the seat belt light just as a reminder to not drive without having the belt on, seems likely the circuit or switch in the belt latch is faulty

 

Note : The reel in the door or B frame does have a system to keep the belt tight, however it ofyen fails and the belt hangs loosely when not worn.

 

 

 

 

Hope that helps

 

Jeff

Edited October 8, 20178 yr by JeffTT

Thanks for that Jeff, so I have multiple failures then, switch on belt (it’s still clicks I can hear it and see it moving, white plastic sort of rocker) and the belt tightener (even though it doesn’t hang loose. I’m just trying to figure out why I hear the the clicking of a solenoid on the passenger side belt roller inside the panel and not on the drivers side ??

Is it the belt feels loose when been worn that is the issue along with the light ?

No Jeff belts tight as in retracts, feel resistance when wearing and if I jerk it (no rude comments) it will lock but I don’t hear a solenoid when the belt is placed into the latch where as I do with passenger side. Just light on the dash and it’s all I can see now as it glares at me.