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2004 Chrysler PT Cruiser Airbag light

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14 Nov 2019 09:40 #35000 by popoften
2004 Chrysler PT Cruiser Airbag light was created by popoften
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

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14 Nov 2019 19:03 #35015 by Cheryl
Replied by Cheryl on topic 2004 Chrysler PT Cruiser Airbag light
Can you post wiring diagram? If all possible... so we can troubleshoot this

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16 Nov 2019 08:42 #35053 by popoften
Replied by popoften on topic 2004 Chrysler PT Cruiser Airbag light
Here is the diagnostic procedure and diagram. Any advice on DIY approach appreciated!

See pix. Thanks!
Attachments:

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16 Nov 2019 09:07 #35055 by Cheryl
Replied by Cheryl on topic 2004 Chrysler PT Cruiser Airbag light
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

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16 Nov 2019 09:20 #35056 by Tyler
Replied by Tyler on topic 2004 Chrysler PT Cruiser Airbag light
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.

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17 Nov 2019 07:44 #35072 by popoften
Replied by popoften on topic 2004 Chrysler PT Cruiser Airbag light
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.

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17 Nov 2019 08:15 #35073 by popoften
Replied by popoften on topic 2004 Chrysler PT Cruiser Airbag light
And the 2300 ohm test was done at the pretensioner connector.

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17 Nov 2019 10:07 #35076 by Tyler
Replied by Tyler on topic 2004 Chrysler PT Cruiser Airbag light
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.

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17 Nov 2019 10:48 #35078 by popoften
Replied by popoften on topic 2004 Chrysler PT Cruiser Airbag light
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?

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17 Nov 2019 12:42 #35083 by Tyler
Replied by Tyler on topic 2004 Chrysler PT Cruiser Airbag light
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:

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24 Nov 2019 08:01 #35275 by popoften
Replied by popoften on topic 2004 Chrysler PT Cruiser Airbag light
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!

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24 Nov 2019 11:36 - 24 Nov 2019 11:47 #35287 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic 2004 Chrysler PT Cruiser Airbag light
ISTR Front impact sensor on Chrysler group ? not pretensioner ?

" Welcome to the 21st"


Last edit: 24 Nov 2019 11:47 by Andy.MacFadyen.

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