Question about Occupant clasification module 2006 Dodge Grand Caravan

Florin Technician Niagara Falls, Ontario Posted   Latest  
Question
Electrical
Occupant Clasification Module Status Unknown

Hello everybody, it is my first time posting a question here and I hope I will be short and clear.

I have this 2006 Grand Caravan for a safety inspection and one of the problems is airbag light on. Scanned and found out that at some point in time somebody replaced the PCM and registered the wrong VIN (missing 1 digit), one of the messages in the OCM was mismatched VIN but also we have OCM status unknown and zeroing not performed. After I registered the proper VIN I was able to perform the calibration on the passenger seat, I am able to erase the airbag light and it stays off until I turn ignition off and then restart vehicle. After restart airbag light comes on and I get the status undetermined message again in the OCM as well as a message in the ORC directing me to problem with OCM.

So it seems like the OCM is not keeping the calibration. My question is what could be wrong OCM or ORC? Obviously powers and grounds are fine since I am able to communicate and to calibrate the passenger seat, also in life data I can see that weight is changing as something is placed on the seat and it is pretty accurate.

I appreciate any hint or any type of help

Thank you

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Oscar Diagnostician
Lorton , Virginia
Oscar Default
 

What code do you get after you cycle the ignition from off to ON? Which scantool are you using to fo the calibration? I have had several issues with this old system, and the only way that I been able to recalibrate the OCM is by using the factory tool, with the appropriate weights. Try to perform a reset module, then do the calibration.

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Florin Technician
Niagara Falls, Ontario
Florin Default
 

I used SnapOn Verus Edge and Autel. With both and with weights on the seat the calibration is performed successful but is not kept in the memory for some reason. I get an P1200 in the ORC and no numeric code in the OCM but the message (OCS undetermined). I have also tried a few times to reset the module and it was successfully reset. After each time I do the calibration and following the steps…

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Oscar Diagnostician
Lorton , Virginia
Oscar Default
 

You may not be able to complete the actual steps with aftermarket scantool, even it says that has completed. P1200 is not a body code. Try to do the battery reset, maybe after that you could do the calibration process, used the Autel, it has better outcomes. With the OEM tool (DRB3) you should be able to get the actual DTC. Good luck.

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Florin Technician
Niagara Falls, Ontario
Florin Default
 

Thank you very much for your input, I was also surprised to see the P1200 code in the airbag module, it didn't make sense to me but that is only happening when it looses the calibration. I will try the battery reset as well. Any Idea if a j box hocked up to OEM site will do the trick? I don't have DRB3 available to me Thank you again

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Albin Diagnostician
Leavenworth, Washington
Albin Default
 

No a J-box will not work. The DRB3 is about the only tool I know will do the trick. The P1200 is not a body code. I looked it up but found nothing for the code. For vehicles like this the DRB3 is your friend.

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Florin Technician
Niagara Falls, Ontario
Florin Default
 

The SnapOn Verus Edge worked as well as the Autel, but we did have OCM into a logic lock out and it didn't take the calibration until we did the hard battery reset as per Oscar's advice. I have previously succeeded many times with battery hard reset, but this time didn't click in to my head. This is the beauty of this forum since human brain has it's own way. We don't always think the same…

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Florin Technician
Niagara Falls, Ontario
Florin Default
 

Hello Oscar, Again thank you very much for your tip about hard battery reset, which was the ultimate fix to my problem. After I did the power reset, the calibration worked and the codes erased themselves. So problem solved, and by the way I managed to do it easy with the SnapOn Verus Edge, since the Autel was not available to me at the time. I performed the calibration with weights from my…

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

Glad you got it working. Can you share what you learned here: "after I found out what weight is associated with the weird terminology like 6 years old child weight and 5th percentile female weight???? as well as the RFIM" - please ?

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Eric Owner/Technician
Edgerton, Wisconsin
Eric Default
   

Hi Geoff, A 5th percentile female is 5 feet (152 cm) and 110 pounds (49.9 kg). A 6 year old child weight is 45 pounds (20.4 kg). I think he meant RFIS which is Rear Facing Infant Seat. The base weight which is supposed to mimic a RFIS (rear facing infant seat) weighs 37 lbs (17 kg).

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

Great info!!

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Florin Technician
Niagara Falls, Ontario
Florin Default
 

As promised, here are the values I found by means of Google in a different forum and they worked for me: RFIS 37 lbs which is the same as Eric mentioned ( I personally don't think they are so heavy) 6 year old child 10 lbs (I don't think is that light) 5th percentile female is 52 lbs (i don't know about that) But following the procedures as per scanner requirements and with this weight…

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Florin Technician
Niagara Falls, Ontario
Florin Default
 

I am glad to, as I mentioned in a replay earlier, sometimes we as humans need a little hard reset in our brains and this is the beauty of this forum. A hard battery reset as Oscar advised worked perfect, but you need to think about it at the wright time, or ask around and you will find the answer, I did this procedure many times before very successful but didn't think about it this time…

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Oscar Diagnostician
Lorton , Virginia
Oscar Default
 

You’re welcome, I’m glad that I was able to help. Just remember for next time, if the OCM has not been replace, and you have a configuration error by other module, fix the problem with the module that is creating the problem. I have seen this problem many times, shops struggle to fix this problem, because they think that they have to do the calibration on the OCM, and ones you do that, the OCM…

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Florin Technician
Niagara Falls, Ontario
Florin Default
 

I think that was just what happened and I think it was all triggered by wrong VIN. This vehicle was just purchased by this customer so we did not have a history. When I found the mismatch codes I was looking in the Airbag module but it took me a few times of checking really close to find out that who entered the vin missed one digit. Probably this was the main reason, but it did not come back to…

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