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Airbag Light, PCM Fault

jgtoranalc

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Originally it had a SDM fault code with an airbag light. I replaced the SDM Module and cleared codes. It fixed the problem with airbag light not returning.
Note: All numbers on the original SDM module had matching numbers with the new module.

Few days of driving, Airbag light returns, I check for codes and found 'Code 19 PCM Fault logged'. Clear code again and it returns after few days of driving again.

-Why would a PCM fault have the airbag light on?
-Do I simply just go ahead and replace the PCM? Note that the owner has said he has had the PCM replaced years ago.
-Why would it take a few days of driving before it faults and logs a code.

Also where is the PCM located on the VU Ute's?
 

krusing

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Same issue a number of times,
Possibly not the PCM,
Maybe other devices like SRS in the Dash, Clock spring, Seats
Loose/faulty connector,
get hold of a wiring diagram and a multi-meter, and back probe the wiring,
But, disconnect the battery before testing.
Or get a Second opinion.
 

lout

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you are using the dash diagnostics to try and track down a srs or pcm code
use the correct scan tool or bridge 5 and 6 for pcm code
 

jgtoranalc

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you are using the dash diagnostics to try and track down a srs or pcm code
use the correct scan tool or bridge 5 and 6 for pcm code

I'm using very advanced scan tools. Don't worry about that.
 

lout

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BlackVXGTS

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if that is correct, then fault 19 is throttle position sensor

No it isn't. You are referring to powertrain/transmission codes. A number of units (such as the SDM) have their own series of fault codes which are similar to powertrain/transmission, but have a different meaning. DTC (fault) 19 is - DRIVER AIR BAG CIRCUIT CAPACITANCE TOO HIGH. Refer to the attached:
 

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  • DTC 19 - DRIVER AIR BAG CIRCUIT CAPACITANCE TOO HIGH.pdf
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krusing

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If your using an advanced scan tool,
it should have indicated what the Fault was, and in what circuit.
Possible a faulty scan tool ?
 

lout

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JMann

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Same happened to me in my VU. I thought it was going to be the Air Bag or the module, but it wasn't.
Disconnect the battery. Any yellow cable disconnected while the battery is on will cause a fault.
Take out the Air Bag, connect the battery and turn on should cause a fault.
Next use a capacitor and a resistor soldered together plug it into the airbag plug from the clockspring (you can google it or I can find mine if you like, and tell you the exact cap and resistor values needed, get em from jarcar). Obviously, I don't want people to use this to bypass the airbag.
This will put load on the system, and it will think the air bag is connected. Connect the battery, Clear the code. Turn off, turn on, Rock the steering wheel, hard. if it comes back its the clock spring. Furthermore, to be sure, test the other side of the clockspring, you use the cap and resistor combo still from memory.
The rest of the safety stuff should clear by itself if you disconnect it (belts etc) and reconnect it but not the airbags. You can test these lines with some resistors inline to create a load (google). The other side of the clockspring you use the cap and resistor combo still from memory.
My guess is the clock spring, I replaced mine 3 years ago with one from a wrecker ($30), still works today.
I just checked either side of the clock spring and cleared the codes as I went, it was pretty obvious.
Mark.
 
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JMann

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20211019_194110.jpg

Capacitor and resistor bypass for airbag test. Resistors for belt tensioner etc.
 
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