Conversions & Swaps LSX Engines in Non-LSX Vehicles
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Creature Comforts question

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Old Aug 23, 2007 | 11:19 AM
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Default Creature Comforts question

On GM vehicles is there another CPU that controls cruise, dimming of lights, door ajar warnings etc etc?

If so, does this have to "talk" to the engine mgmt cpu?

john
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Old Aug 23, 2007 | 11:23 AM
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Cruise control is run through the PCM.

Not sure on the body stuff, but it's prob through a BCM for each specific vehicle and I'm am pretty sure they do not communicate.
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Old Aug 23, 2007 | 02:23 PM
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Does the engine pcm display speed, rpm, oil press etc?

Is it just an obdII stream?

john
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Old Aug 23, 2007 | 04:33 PM
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Like was said, the BCM is responsible for different things on different vehicles. As far as the F-body is concerned, the BCM controls headlights, taillights, door locks, trunk release, and door switches in addition to many other functions.

To get a good idea of what it does, here is a Pin out for a '98 Fbody. Not sure if they've changed over the years. http://www.lastofthebreed.com/Servic...ssignments.htm

Also, you are correct, the data you're looking for will be included in the OBD-II serial Data stream.
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Old Aug 23, 2007 | 08:15 PM
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Is oil pressure in that stream too?
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Old Aug 23, 2007 | 09:37 PM
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Originally Posted by eagleuh1
Is oil pressure in that stream too?
No the oil pressure sensor is not connected to the PCM
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