2004 Chrysler PT Cruiser Airbag light

My Autel AP200 scanner dongle displays an active and a stored P1200, airbag pretensioner circuit open code. Resistance in the driver’s side pretensioner unit itself reads 0 ohms on my Klein auto ranging DVOM. Not an open, I know, but from what I have read that resistance should be between 2 and 5 ohms. Tried a 2ohm resistor plugged in to connector in place of pretensioner And light stays on and code won’t clear. Resistance on the circuit measured at connector is 2,300 ohms. What else can I measure? Are there any insights that can be gleaned from what I have found?

Thanks, guys,

Pop

Can you post wiring diagram? If all possible... so we can troubleshoot this

Here is the diagnostic procedure and diagram. Any advice on DIY approach appreciated!

See pix. Thanks!

What does the passenger side pretensioner read? If you put a 2 ohm resistor in place I’d try with the passengers side to see if the module responds. Only other thing after that is checking resistance of the wires from ocm to drivers pretensioner for opens and shorted to each other or short to grounds/power

To be clear, the SRS light is on, right? Just making sure the scanner isn't sending you on a wild goose chase.

Resistance on the circuit measured at connector is 2,300 ohms.

Really? :huh: So, with the ORC disconnected, 2 ohm resistor installed at the drivers belt pretensioner, you measure 2300 ohms at pins 1 and 2 at the ORC? If that's correct, you're looking at green crusties somewhere in the circuit.

Hello, Tyler, yes the airbag light comes on when key turned on and stays illuminated. The P1200 is both a stored code and an active code. The 2300 ohm measurement I did out of curiosity, but with no resistor installed. That may not have been a valid test.

And the 2300 ohm test was done at the pretensioner connector.

Gotcha. If you're confident that you had the two ohm resistor installed into the pretensioner connector correctly in step two, I'd redo step three and see what the total circuit resistance is. The way you had it set up previously may have been reading the internal resistance of the module itself.

I do not have the "load tool adapter" step three talks about. Can I measure the resistance in the circuit without the adapter and just carefully use the ends of my ohhmeter leads?

Sure! That'll work. Just pick one wire at a time and measure for resistance and short to ground. With the ORC and pretensioner disconnected, of course.

The load tool they're talking about is just your two ohm resistor. Dunno why they can't call it what it is. :lol:

Well, we got as far as partially pulling the console to access the control module wires, but the owner of the car, who I was assisting on this project, understandably didn't want to mess with the shift and parking brake linkages, so then the attempt was made to remove the front drivers seat, but one of the bolts developed stripped threads. SO in light of the fact that the project was rapidly careening into the weeds ( at least as perceived by two DIYers), the owner decided to donate the car.

Thanks, all, for your help!

ISTR Front impact sensor on Chrysler group ? not pretensioner ?