![]() ![]() Miraculously, the first attempt nailed it.Ĭycled ignition 3 times and the SRS light was off for the first time (10,000miles, 6 months) since removing the bench seat. I was ready to test with a bunch of resistances and had set up a potentiometer to do so (pic attached). I assumed 12V "operating voltage" and 5mA output current: Wondering if the switch could be spoofed with a resistor for a particular state, I used Ohms Law to calculate a substitution resistance. This is because the sensor requires a voltage across its leads to operate.Ĭouldn't find any spec on the Promaster Hall-Effect sensor but I found a datasheet for another hall-effect seat belt switch (attached). Notably, when you measure the switch resistance with a multimeter, you will find an open circuit whether the belt is buckled or unbuckled. If it is outside the expected range, your SRS light pops on after 2.5 seconds. The Occupational Restraint Controller (OCR) applies a voltage to it every 100ms and reads the output current. The primary gotchya is that the seat belt switch is a Hall Effect sensor. With countless hours dumped into this, I was at my wits end about to cave and purchase the MOPAR part or maybe hit up a junkyard for late-model FCA belt buckles. This has been beat to death on this forum, but as far as I can tell, there are no reported successes without purchasing another seatbelt buckle assembly ($280 MOPAR), or in rare cases, the "ebay dongle". ![]()
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