Air Bag question!!!!

**Ken** · 05-12-2013, 09:50 PM

Originally Posted by natertot

Thinking about it further, the tech probly meant that he disconnected the three modules which would be the Engine Control Module, AIrbag Control Module and the Anti-lock Break System Module. For the 94-04 Mustang, I don't think they had any more than those three.

It's also got a Powertrain Control Module and a Constant Control Relay Module.

**natertot** · 05-12-2013, 09:51 PM

Originally Posted by Ken

It shows a "data link collector," left and right "primary crash sensors," a "diagnostic monitor," and a "clock spring assembly" that "electrically connects steering wheel controls to body harness." And this is why I have Ford mechanics work on my car.

The left and right primary crash sensors are what's behind the front bumper. Diagnostic monitor is the dummy light in the dash that will flash. Count the flashes and it will give you diagnostic codes. Clock spring assembly is in the steering wheel and connects to the body harness in the steering column which your driver airbag is wired through. Airbag plugs into clock spring assembly, clock spring assembly connects to body harness, body harness connects to the ACM. The book may be calling the Airbag Control Module the "Data Link Collector", but I'm not certain. That wording doesn't ring a bell to me, but it has been nearly ten years since since I was a Ford Intern Tech.

+1 on taking your car to a Ford Tech.

**natertot** · 05-12-2013, 09:56 PM

Originally Posted by Ken

It's also got a Powertrain Control Module and a Constant Control Relay Module.

PCM is the same as PCU, ECM, ECU. Powertrain Control Module (Unit) Engine Control Module (Unit). Depends on the year of manufacture. Ford changes their names for the same thing overtime.

The CCRM controls your radiator fan. It is more of a relay than a module and is actually controlled by you PCM. PCM gets data from the heat sensors, when the PCM thinks the engine is getting too hot, it tells the CCRM to turn on the cooling fan.

**natertot** · 05-12-2013, 09:58 PM

Originally Posted by Ken

These things must have been written by mechanic lawyers.

Now you know how I feel!

**Ken** · 05-12-2013, 10:04 PM

Originally Posted by natertot

Now you know how I feel!

I'm putting the books down now. I have a headache. Think I'll just read something simple, like "Conflicts of Law and International Trade Agreements."

**natertot** · 05-12-2013, 10:21 PM

Originally Posted by Ken

I'm putting the books down now. I have a headache. Think I'll just read something simple, like "Conflicts of Law and International Trade Agreements."

Putting them down? We were just getting to the good stuff! I don't think I'll ask about "Conlicts of Law and International Trade Agreements" as I don't want your headache!

Sorry to the OP for another thread hijack by yours truly. Once again, if the sensor is removed and the wires are covered and not crossed, the bags should not deploy. You should only get the airbag light on your dash.

**Ken** · 05-12-2013, 10:27 PM

Originally Posted by natertot

Putting them down? We were just getting to the good stuff!

Well, in that case, why don't they simply use 2 C250 instrument clusters instead of a C250 and a C251?

**natertot** · 05-12-2013, 10:34 PM

Originally Posted by Ken

Well, in that case, why don't they simply use 2 C250 instrument clusters instead of a C250 and a C251?

I don't know the design decisions, just know a few things when crap goes wrong. I'd have to guess it would depend on the info the designers wanted to display and how many wiring connections were needed. Just pulling that out from where the sun don't shine as I really do not know. I don't even know what C250 and C251 are.

**Ken** · 05-12-2013, 10:51 PM

They're both 16 pin instrument clusters. #16 is on the left side on both. C250 goes from 16 - 8 with a break and then from 7 - 1. C251 goes from 16 - 10 with a break and then from 9 - 1. Otherwise they appear functionally identical. I figure it must be for the same reason that I had to have half of the top of the engine removed to replace a faulty tranny fluid cooler door sensor so that the damn check engine light would go off and I could get my new inspection sticker.

**natertot** · 05-12-2013, 11:03 PM

Originally Posted by Ken

They're both 16 pin instrument clusters. #16 is on the left side on both. C250 goes from 16 - 8 with a break and then from 7 - 1. C251 goes from 16 - 10 with a break and then from 9 - 1. Otherwise they appear functionally identical. I figure it must be for the same reason that I had to have half of the top of the engine removed to replace a faulty tranny fluid cooler door sensor so that the damn check engine light would go off and I could get my new inspection sticker.

Are you getting C250 and C251 from a schematic or diagram? If so, that would be the code for the connection. C250 would be Connection #250 and C251 would be Connection #251. No two connections would ever have the same number.

**Ken** · 05-12-2013, 11:29 PM

Diagrams of two instrument clusters. Page 60-6 of the Electrical and Vacuum Troubleshooting Manual. One is labeled C250 Instrument Cluster and the other is labeled C251 Instrument Cluster.

**hunter63** · 05-13-2013, 11:15 AM

After experiencing a heat sensor problem on my '99 F 150, (under manifold $1300 bucks), and a lengthy quest to find the fuse for the trailer running lights, (shorted plug) on the 2008 F 250.....I have discovered that service manuals, and owner manuals are completely useless.

Dealer techs are a bit better but do expect you to pay form their lack of knowledge, (reference the 2 visit, not finding the problem the first time, so having to pay for the second visit).

Having been around awhile, and built several race cars from basically scratch, HVAC service tech for 10 years, so don't feel I am totally stupid, but I have concluded.....we need not worry about EMP and such......our gadgets will be out down fall on any thing newer the maybe 1969? or so.

If all else fails, park in field and use for chicken coop, they make new ones evert day.

Good luck on your quest on the Jeep, must have been interesting to get to that stage.

**welderguy** · 05-13-2013, 02:51 PM

Originally Posted by hunter63

After experiencing a heat sensor problem on my '99 F 150, (under manifold $1300 bucks), and a lengthy quest to find the fuse for the trailer running lights, (shorted plug) on the 2008 F 250.....I have discovered that service manuals, and owner manuals are completely useless.

Dealer techs are a bit better but do expect you to pay form their lack of knowledge, (reference the 2 visit, not finding the problem the first time, so having to pay for the second visit).

Having been around awhile, and built several race cars from basically scratch, HVAC service tech for 10 years, so don't feel I am totally stupid, but I have concluded.....we need not worry about EMP and such......our gadgets will be out down fall on any thing newer the maybe 1969? or so.

If all else fails, park in field and use for chicken coop, they make new ones evert day.

Good luck on your quest on the Jeep, must have been interesting to get to that stage.

It was very interesting, my ramps slipped just as the front tires were coming off the trailer. Grand Cherokee bumpers are not ment to support the weight of the jeep, so now it laying next to the jeep.

**2dumb2kwit** · 05-13-2013, 08:13 PM

Originally Posted by Ken

I'm now flipping through my '96 Mustang "Electrical and Vacuum Troubleshooting Manual." I can barely lift the Service Manual. The thing must be 2,500 pages long. Can't tell, because it's broken down into sections rather than sequential page numbers.

Hehehe.....He keeps it on the drivers seat, so he can see over the steering wheel.