Airbag light on

Yes the new SRSCM was reset according to the company I purchased it from. I’m new to detecting electrical issues so please bear with me as I attempt trying to learn and fix this issue. When I look at the wiring diagram it looks like the wire for the PFIS goes from the sensor, along the side fender, behind the glove box, down the center instrument panel than into the SRSCM. When I’m looking under the hood I see that the cable is joined by several other wires. This includes wire for headlight, alarm horn, the ABS module and a thick black box with a yellow release lever attached to it. (See photo I attached). I’m not sure what this is but assume it’s part of the ABS. I saw yellow and at first thought it had something to do with the SRS as they usually always use yellow. The yellow lever that was on it was broken off. If I was to attempt to replace the harness for the sensor would it be one continuous harness I would need to fish from the sensor to the SRSCM or is their a break in the wire with another connector? The wire looks great inside the vehicle. The connector that connects to the PFIS looks a bit rough compared to the driver side. The driver side wire and sensor looks as if they are brand knew they are so clean but the passenger side looked dirty and rusty. I cleaned it all off and it looks a lot better. Thank you so much for all your help. I really appreciate it. I’m hoping to give this car to my son and talk my wife into getting a new car. But I want this car to be safe for him so I really want this fixed.

Thank you. So you think it has a pinch or slice somewhere in the line causing it to groundout? Or even possibly a bad connector at one of the 2 ends? I’m going to swap the driver side and passenger side sensors tomorrow. If the code switches to the driver side than I’ll at least know it’s the sensor. If it doesn’t than I guess I’ll be pulling the dash and fender. Really hope I don’t have to go that route. Thanks for the help.