Ok I just went through the service manual again, it's probably the passenger side seat that's needing replaced. There is the occupant classification sensor, belt tension sensor, and occupant classification control module. Most of these things are literally built into the seat cushion.

However there was a TSB about problems with the harness on that seat, it's the big yellow or orange wire harness on the bottom of the seat and due to vibration there are wires that can wiggle loose and become damaged. Here's a link to that TSB so you can check it first.

https://static.nhtsa.gov/odi/tsbs/20...44443-7463.pdf

Also, the diagnostic control module (airbag computer) needs to be replaced anytime it's deployed an airbag, when you put the system into diagnostic mode it should be shooting out a generic error for "diagnostic module error".

 

Also, here's a link to the FSM, you want section SRS - Supplemental Restraint System.

https://www.nicoclub.com/infiniti-service-manuals

 

Thanks for the follow up Cleric.
From your last post, I had stumbled across that TSB and did the connector cleaning and applied no-ox on the pins and zip tied the connector together and in place before running the scan again.
I put the car in diagnostic mode and get the code of one long and five short flashes on the airbag indicator in the instrument panel.
I pulled the FSM and have been reading through various sections.

However there was a TSB about problems with the harness on that seat, it's the big yellow or orange wire harness on the bottom of the seat and due to vibration there are wires that can wiggle loose and become damaged. Here's a link to that TSB so you can check it first.

https://static.nhtsa.gov/odi/tsbs/20...44443-7463.pdf

Also, the diagnostic control module (airbag computer) needs to be replaced anytime it's deployed an airbag, when you put the system into diagnostic mode it should be shooting out a generic error for "diagnostic module error".

 

If it's this pattern then that is the passenger/right side, side curtain airbag.







If it's this code it's that occupant classification system in the passenger seat cushion. I've never tried to replace the individual components, it might be possible without having to replace the entire seat cushion.

 

cleric, I had to charge my battery from all the scanning and testing. It shows the second scenario you posted, 3 seconds on the 5 quick flashes. I tried to add a video here, not sure if it will show up or not.

Headed out of town to pick up two seats and a few small items tomorrow. Hopefully this corrects the issue.

 

Yeah it uploaded, for the future my preferred way to post video is to upload them to youtube, then put the link here in the message body and it will automatically embed the video. Attaching a video like you did does work but requires folks to actually download the video and playback on their device rather than just stream a youtube video.

 

cleric / all,
I wanted to follow up on this, I took some time off from the car due to some other things that took precedence. I got the new seats and installed them, still have two items of concern. The B1019 code is still coming up when I scan and the air bag light on the instrument panel is flashing a code that you posted earlier in this thread, in maintenance mode is 7 sec on, off, 3 sec on, off, then 5 1 sec flashes, then it repeats starting with the 3 sec on.

I am up to tracing wiring which is not fun as you all know but I will keep this updated and let everyone know when I find the issue.

This is the info from my scanner:
System Codes Description Status
Air bag B1019 Belt tension sens [unit fail] CRNT

Thanks,
Steve

 

Moderator EDIT: Adding a long PM conversation from Cartboy67 that details various other troubleshooting steps we have tried.

 

@Cartboy67 Ok, next step would be testing power/ground and possibly the "signal" source on both the belt tension sensor and the occupant classification system WHILE THEY ARE ENERGIZED.

All the testing will be done at the occupant classification control box. You will need backprobe wires and some insulated alligator clips for your meter.

Write down and report back on each of these voltage tests.

-Right side belt tension sensor

1. test the 5v power on pin 16 pin/blue stripe, test it against the ground wire pin 14 red/yellow stripe

2. Same voltage test but signal wire pin 4 red wire tested against the same pin 14 red/yellow stripe

-Occupant classification sensor

1. test the 5v power on pin 7 green wire against the ground pin 15 orange wire

2. same voltage test but signal wire pin 6 yellow/red stripe against the same pin 15 orange wire

Without someone sitting in the seat test 2 will PROBABLY be a very low voltage reading, they probably use an end of line resistor so the computer can verify the circuit is actually intact, so it might be like 1v or less if no one is sitting in the seat. Roll the seat back and sit down in it and you should probably see 5v across pin 6 and 15 with you sitting in the seat.

I suspect the same thing with the belt tensioner, but I'm assuming a good belt tensioner will read back the same 5v on the signal wire.

 

Next, if you have the other seat, swap it in and do the exact same test. Pay particular attention to the belt tension sensor since that's the code you're having the problems with.

Possibly just unplug the belt tension sensor from the old seat and put it in your existing seat. Just to verify the B1019 is the belt tension SENSOR, it's mounted up under the seat cushion along with the occupant classification sensor.

 

This post created more questions than answers. I am looking at what I believe to be the OCS Control Unit on my car. The white module under the front, lower part of the seat, mounted to the black metal plate. Mine has 16 pins and 15 wires (the FSM shows a pin 18) and none of the colors correlate to the FSM you sent or the one I have on my computer. The colors you mentioned don't line up with my connector, I don't even have a red/yellow stripe or an orange wire in that plug. The FSM shows this as connector B582. Rain has set in for the day and my other seat is in my shed so I didn't get to take a look at that one. I am at a stopping point for the day and will continue after the Holiday.

 

The occupancy classification system control unit should be the black Kalsonic unit under the seat.

 

That explains a lot...I'll get back into it and check the voltages on that module/connector.

 

I did the voltage checks, here are the results.
Right side belt tension sensor

1. test the 5v power on pin 16 pin/blue stripe, test it against the ground wire pin 14 red/yellow stripe
5.02 VDC
2. Same voltage test but signal wire pin 4 red wire tested against the same pin 14 red/yellow stripe
4.99 VDC
-Occupant classification sensor

1. test the 5v power on pin 7 green wire against the ground pin 15 orange wire
5.02 VDC empty and seated
2. same voltage test but signal wire pin 6 yellow/red stripe against the same pin 15 orange wire
3.99 VDC empty / .2 VDC seated

I also noticed the passenger airbag off was lit up whether I was in the seat or not.

 

Airbag off light was probably lit due to not having the seat belt buckled.

That's crazy, you're really running out of troubleshooting steps...

Looks like everything checks out on that Kalsonic unit, next I would swap the belt tension sensor.

Did you say all the steps of the NHTSA recall were done, brackets to support wires and epoxy on the harnesses? Here's a link to the recall with all the pictures.

https://static.nhtsa.gov/odi/rcl/201...0V175-0901.pdf

Also, you did swap the entire seat belt yes? Just verifying that the seat belt tensioner was actually swapped for a different one.




You should probably be able to test that belt tension sensor. I'm guessing it's just an open/closed switch so pins 1 and 3 should open/close circuit then you pull or push on the belt tensioner. It will probably have the same results as the occupancy sensor.