The rear seat belts in that vehicle are typically standard non-pretensioner seat belts. You can simply check if they are locked or functioning properly. If they are locked, faulty, or not working as they should, we can rebuild them.
However, some newer vehicles, such as Nissan, Infiniti, Lexus, BMW, Audi, and Mercedes, may have pretensioners in the rear seat belts. For these models, please test the resistance to determine if the belts have been deployed.
How to Properly Test Ohms Resistance
1. The first thing that you need to do is to make sure you have your ohm tester on the right selection.
2. Grab the two leads and place them on the port of the seat belt pretensioner.
3. You should be getting anywhere between two to three (2.0-3.0) ohms. This means it's a good unit.
Good Seat Belt Resistance
2.0-3.0 OHMs
Bad Seat Belt Resistance
If you are not testing 2.0-3.0 ohms, please send your unit in for repair.
Shortening Bars
Some seat belt models have a shorting bar on the port that will require you to push it away before properly testing. The shortening bar's purpose is for transportation for when it is not installed in the vehicle. To prevent any type of deployment. The plug will push the bars away for an accurate reading and for the deployment to happen if you are in an accident. A reading like 0.5 ohms is usually when the shortening bars are not pushed away.
This test can be performed on: seat belts, anchors, buckles, collapsible steering columns, roll over bars, positive battery terminals / cables.
Tools Needed
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Multimeter
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Zip tie
Video: