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2006 Jeep Grand Cherokee Laredo 3.7L

  • robert.lesaca
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04 Jul 2019 18:04 #31396 by robert.lesaca
2006 Jeep Grand Cherokee Laredo 3.7L was created by robert.lesaca
This jeep was brought to me today. owner mentioned that when driving; he would turn on his AC and after a while it would turn off by itself while at the same time the airbag and OCS light (passenger airbag "off" position); AC will resume working as soon as Airbag/OCS light disappears. He also mentioned that a mechanic replaced the ignition module recently but the problem still persisted.
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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04 Jul 2019 18:47 #31397 by Cheryl
Replied by Cheryl on topic 2006 Jeep Grand Cherokee Laredo 3.7L
Just the air conditioning turns off and airbag light come on? Or the vehicle turns off?

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04 Jul 2019 22:14 #31400 by robert.lesaca
Replied by robert.lesaca on topic 2006 Jeep Grand Cherokee Laredo 3.7L
yes, AC turns off and airbag lights turn on

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05 Jul 2019 02:32 #31405 by jreardon
Replied by jreardon on topic 2006 Jeep Grand Cherokee Laredo 3.7L
"B212D - ignition run only input circuit open" The set condition for this is telling. So somewhere between the Run Relay and the Occupant Restraint Controller, there's a voltage drop to below 6 volts.

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.

The following user(s) said Thank You: Tyler

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07 Jul 2019 13:31 #31491 by robert.lesaca
Replied by robert.lesaca on topic 2006 Jeep Grand Cherokee Laredo 3.7L
Being a Sunday, I was looking at the wiring diagram I remember the owner mentioned AC is affected when airbag DTC comes on, having a bigger power requirement compared to the rest of the components (park/neutral switch, inside rear view mirror, electronic overhead module and that share the same power, upper /lower bank switch) sharing the same battery feed.

I will keep you posted. Thanks for your response...much appreciated.

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15 Jul 2019 09:58 #31824 by robert.lesaca
Replied by robert.lesaca on topic 2006 Jeep Grand Cherokee Laredo 3.7L
hello...sorry for the late posting. owner finally brought is jeep to my place. after taking out center console exposing the ORC, I probed pin # 16 (fused ignition switch) and pin #24 (fused run-relay out put.

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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15 Jul 2019 10:41 - 15 Jul 2019 10:43 #31825 by robert.lesaca
Replied by robert.lesaca on topic 2006 Jeep Grand Cherokee Laredo 3.7L
i forgot to attach the DTC...notice B212D is active after the fused run-relay output voltage dropped to 0V

ooops sorry picture inverted
Attachments:
Last edit: 15 Jul 2019 10:43 by robert.lesaca.

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15 Jul 2019 13:36 #31828 by jreardon
Replied by jreardon on topic 2006 Jeep Grand Cherokee Laredo 3.7L

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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15 Jul 2019 13:52 #31829 by jreardon
Replied by jreardon on topic 2006 Jeep Grand Cherokee Laredo 3.7L

ooops sorry picture inverted

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 imgur :D

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15 Jul 2019 21:08 #31834 by robert.lesaca
Replied by robert.lesaca on topic 2006 Jeep Grand Cherokee Laredo 3.7L
Ive double check power and ground. unfortunatey there is a special tool to use to check resistance of:
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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15 Jul 2019 21:12 #31835 by robert.lesaca
Replied by robert.lesaca on topic 2006 Jeep Grand Cherokee Laredo 3.7L
fuse 10 is ok...

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15 Jul 2019 21:17 #31836 by robert.lesaca
Replied by robert.lesaca on topic 2006 Jeep Grand Cherokee Laredo 3.7L
here is an image of R106 voltage when no airbag lights on. but as soon the light come on, voltage drops to almost 0V
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16 Jul 2019 06:50 - 16 Jul 2019 06:51 #31840 by jreardon
Replied by jreardon on topic 2006 Jeep Grand Cherokee Laredo 3.7L
Concerning F100, I would do voltage drop test KOEO and KOER. To rule out issue with ORC, jump fused jumper wire to power on that wire at pin 24 and see if the DTC goes away.

Last edit: 16 Jul 2019 06:51 by jreardon.

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16 Jul 2019 06:53 - 16 Jul 2019 07:01 #31841 by jreardon
Replied by jreardon on topic 2006 Jeep Grand Cherokee Laredo 3.7L

at KOEO, my red meter (for pin 16) and yellow meter (for pin 24) read battery voltage.

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.
Last edit: 16 Jul 2019 07:01 by jreardon.

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16 Jul 2019 21:50 #31872 by robert.lesaca
Replied by robert.lesaca on topic 2006 Jeep Grand Cherokee Laredo 3.7L
I explained today with the owner the results of my test. We were discussing the possibility of the ORC being faulty. He called after market shops who did not carry the controller; he called the dealer and was told that this is no longer in production and if ever it would cost $800 plus. I mentioned since the fault is intermittent and surprisingly if the airbag light does come on, AC would still work. He decided to just learn to live with it as long as no drivability problem. So all was left at that and drove the vehicle home.

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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