[zbi701]

Without capacitor in parallel you will get ”unocuppied” status. I‘ve done numerous bench testing on this with Scope to see the output waveform. In summary, the resistor in series just to clear the seat mat break alarm, the resistor in parallel to clear the seat mat short alarm. You can confirm this with Pasoft also.

 

[zbi701]

second this. cheap and effective.

Be careful some of the ebay simulator just good for clearing codes...you really need to make sure the passenger seat status as well whether it’s “Occupied” or “Not Occupied” after installing the simulator, this will determine the passenger airbag will be deployed or not during collision. Refer to my post #6.

 

[zbi701]

Agreed. The bag won't deploy lacking the cap.

ZBi701 were you able to check to see if they are sending a square wave to the little black box. At 1st glance their little circuit makes no sense without a square wave coming from somewhere and doing something.

I was able to see how the output square wave going from the black/blue font box to the SRS module by varying the simulator resistor/cap/diode configuration and values Here are some screenshot.

Seat mat break waveform

Seat Not Occupied waveform

Seat Occupied waveform

Whatever simulator connected to the present black with blue font box, the output signal going to SRS module must be similar to these.