2006 grand cherokee seat belt
Have the same problem in my 98 Toyota Rav4. I squirted the female buckle (bolted to seat, not holding strap harness) with wannabe WD-40 lubricant from the $1 store, and it seem to have solved the problem. I'm guessing the spring mechanism is worn out, which is why the harness buckle won't lock. Another solution is to replace the female lock buckle with an identical part from the used parts junkyard store.
The seatbelt light on the dash stays "on," even when everyone has their belt on, but I don't bother servicing that. If yours have an audible alarm instead of an indicator light on the dash, locate the source of the alarm sound and disconnect the wires to silence the sound.
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