I've got to rant a little, media and the gov told the auto industry that they were greedy selfish ba$stards for NOT putting airbags in every car. The auto industry said the technology is NOT ready, and air bags can create as many injuries as they save people form injury, etc, etc. The gov mandated air bags. Then parents putting babies in car seats in the front seat, and bumping bumpers in the parking lot resulted in several babies being decapitated/killed by the airbag going off, as well as injuries to adults also. So the media and gov, instead of saying "I guess you're right, you told us so", they said the industry was greedy selfish ba$tards for making less than perfect air bags. So a whole new generation of airbags with new standards were mandated. Part of that standard is determining if an adult is seated in the front seat and turn the passenger side airbag on/off accordingly. I.e. why you have a weight sensor that needs to be calibrated.
Also part of the new standard was demanding six sigma reliability of the system, that resulted in the only way to meet those standards with statistical analysis incorporated into the design with incredibly exacting self-monitoring and servicing way beyond a typical consumer vehicle. Things like gold plated connectors, shorting bar connectors, expensive calibration and certification processes, built in self tests that fail systems for minor variations in circuit resistance that naturally may occur from age, etc.
Half the time your air bag inop light goes on, its for a bogus test that would indicate your air bag system has measure some extreme slight degradation and the level of confidence may only be 98.7% instead of 98.8% reliability. Or it might NOT be working at all because of a serious problem was detected, you just don't know until you read the codes. Anyone want to wonder why new cars are so expensive now-a-days?
OK rant over.
Its already been mentioned, the seat weight sensor should NOT need to be recalibrated constantly, there is a problem and the dealer diagnosed it wrong. Unless you diagnosed it yourself and specifically instructed the dealer to just calibrate the seat sensor everytime, they didn't diagnosed it properly. It might still be the seat sensor, but a bad sensor or maybe the sensor came unmounted, or something in your seat broke, did they even check?
Doing yourself through the OBD port? Sorry, airbags are outside the mandated OBDII codes and protocols, so the manufacturer keeps those protocols and tools proprietary and makes it extraordinarily difficult for DIY'er or independent shops to access that. Perhaps a big independent shop in your area has invested the 10's of thousands of dollars for hundreds of dollars worth of equipment, to have the privilege of accessing the protocols to read the codes and do any procedures or calibrations. Most DIY'er do NOT have the money to pay the $20k for the dealer tool, that still won't be totally capable, because many procedures require logging into a Corporate HQ database that only dealers have access. (Oh, the $20k tool, its just a laptop with a Cable, that has software that has the secret protocols, the dealer doesn't have to pay $20k, you, I and independent shops have to pay $20k for it).
There are several "reversed engineer" tools out there, I have autoenginuity, the cost $500-$1000, have limited ability but a lot more than most OBD tools. My autoenginuity can read the codes for later airbag systems, NOT sure if it can calibrate a seat sensor, and it can only do it for Chrysler based vehicles. I have to pay extra for each manufacturer I want to add the ability to talk to.
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