[FIXED] 2006 Jeep Grand Cherokee Laredo 3.7L
- robert.lesaca
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Initial scan showed:
1. B212D - ignition run only input circuit open
2. B1206 - Passenger airbag indicator circuit open
3. B1204 - Passenger airbag indicator circuit low
has anyone experienced something similar? thank you...
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- robert.lesaca
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Further diagnosis required. I'm going to guess the run relay (in junction block) has bad contacts, fuse 10 has bad contacts, or wiring problem through the upper switch bank (what is that?) to the orc (occupant restraint controller).
Get this fault to stay (easier said than done right? ) and use your multi meter to find this voltage drop between the wires to zone in to the section of wire or component.
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- robert.lesaca
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I will keep you posted. Thanks for your response...much appreciated.
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- robert.lesaca
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in the attach image, at KOEO, my red meter (for pin 16) and yellow meter (for pin 24) read battery voltage. at KOER, both meter read 14+ V and no airbag lights. i momentarily turned ignition off and put to run position, my red meter read 12V while my yellow meter read 0V and airbag lights on. KOEr, my red meter showed 14+ V while my yellow meter showed 0V and the airbag light lit.
so it seems pin 24/fused run-relay output is the problem is.
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- robert.lesaca
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robert.lesaca wrote: notice B212D is active after the fused run-relay output voltage dropped to 0V
Yup. I didn't realize until now but if you read the DTC description it says exactly what wire (is wire correct term, or more like circuit, i dunno) it is. For B212D it's F100, and for the others, B1206 and B1204, it's R106. Lol that's so nice, it right there in the image haha. It was so small I didn't even see it!
I circled them in blue
As for how this air bag thing is connected to the A/C, all i see is Fuse 10
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Totally fine, I just open image in a new tab and orientation is fixed. Dunno why images get messed up when hosted here. That's why I use imgurooops sorry picture inverted
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- robert.lesaca
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1. R106 between ground and ORC adoptor #9 to see if it falls below 100 ohms. You have an idea how to check resistance without this adaptor?
2. another adaptor to measure resistance of R106 between adaptor and cavity 1 of upperbank connector.
im not comfy whrn it comes to airbag diagnosis. but i hv a feeling is the ORC that is defective here. what do you think?
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- robert.lesaca
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- robert.lesaca
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That voltage reading at pin24 alone rules out a blatant short to ground in the wire. Now to see if ORC is faulty or no, jump fused power to pin 24 at ORC and see if dtc clears up.at KOEO, my red meter (for pin 16) and yellow meter (for pin 24) read battery voltage.
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- robert.lesaca
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I was not able to do your suggested jump but it did occur to me to do just that. But my gut feel is a faulty ORC after all electrical integrity was done - no open, no short to ground, no broken fuse or relay...all probable causes was eliminated except for the ORC. But hey, the owner decided to just live with it.
Thank you for your inputs as it greatly helped.
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- robert.lesaca
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THANK you to all who responded and offered help, This vehcile is FIXED
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- robert.lesaca
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Thanks Tyler.
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- Gasoline2Diesel Tech9
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2008 Jeep Grand Cherokee Loredo with a 3.7L v6 168,000miles with the Same exact issue. The customer came in a few weeks ago, another tech evacuated and recharged the a/c system and sent the customer down the road. They got 1/2 mile down the road and the system quit. Luckily I know the customer's boss, so they brought it back with strict rules that I am the only tech to touch the vehicle. Nothing pisses a person off like charging them and not fixing the issue then on top of that saying you don't know take it to the dealership.
I was going through wiring diagrams to see where the AC and SRS (Airbag ) system shared power AND/OR ground. Already checked fuses and relays. Then something said "even though this is not a common code let's google it " my results brought me to this forum. I tested the same 24 pin wire with my power probe 4. As soon as that wire lost power 14v with KOER the blower motor shut off then shortly after the airbag light came on. I still had power at the other wire. So it seems to me the module was shorting out internally once it got too hot. Only If you turned the vehicle off and let it sit for 15mins it work again for 5 or so mins then cut off again. Clearing codes did nothing.
What made this challenging is the code lead you to believe it was an issue with the ignition switch.
The module is $450 and there is $100-$120 programming fee. The customer is happy to finally have answers, our shop did not charge for the 2nd trip which was more expensive (truck was smoking due to a valve cover leak, also truck was run a little hot due to the thermostat, and had a swollen radiator hose, as well as a few other issues they wanted looked at) also their Boss knows a guy at a dealership to save the customer money on the module and reprogramming, lastly the customer asked me to leave the center console out they will put it back together once the new module is installed.
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- Mattypow585
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