I have a 2000 4Runner with 270k miles and recently noticed the Airbag light flashing I pulled the codes I got a B0131 for open circuit on passenger seatbelt pretensioner. I checked the repair manual it takes me to diagnosing the circuit, Airbag Sensor Assembly, and P/T Squib. Not much to it these trucks are very old now before I diagnose it whats the chances I will have to send my seatbelt for rebuild? Anyone had such problem?
2000 4Runner Airbag Light B0131
- Thread starter FD7683
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2TH4IST
Member
I recently replace my drivers front seat belt as for some odd reason the Pyro mechanism was giving off some foul smell that made the belt part stink to high heavens. New oem ones are still available, so if you need to replace it I would go oem and avoid the rebuilt route as it's a safety item.
TheDurk
Elite Member
I just went through this for the driver's side on my '99. I went through the whole FSM diagnosis procedure for that code which confirmed that there was no circuit issue and that the issue was indeed the seatbelt unit. It might be worth it to go through the exercise as those things are not cheap. I got it from my local dealer because it's hazmat shipping from anyone else and it costs like $95 to ship. It was worth it as the return spring on my old one had arthritis and the new one is just a pleasure to use. I don't know if you can even find a rebuild service that can fix that kind of issue; the ones I saw just do the springs and belt. SRS light went away as soon as it was installed; no reset necessary.
spartacus
Senior Member
This site advertises fixing the pre tensioner.
TheDurk
Elite Member
Good find. I would have tried that if I had seen it. I tried to find a JY one but the only one I found had the belt cut. I tried to do a transplant but it just would not go back together. Note that the FSM specifically prohibits the use of used components on this system, but it's the kind of thing I routinely ignore.
increasedc
New member
I wouldn't rush into rebuilding or replacing the seatbelt just yet. An open-circuit code doesn't necessarily mean the pretensioner itself has failed. Given the age of the truck, I'd first want to rule out a wiring issue or a damaged connection in the passenger-side circuit. The airbag system can be sensitive to poor connections, so it's worth checking the relevant wiring and connectors using the factory diagnostic procedure. Since this is part of the SRS system, make sure the battery is disconnected and the manufacturer's safety precautions are followed before any inspection. If the wiring checks out, then testing or having the pretensioner inspected by an SRS specialist would be the next step.
