I'm trying to get a new BCM because my A/C doesnt work and i think it needs a new one. My BCM part number is 15780945 and the only ones closest I can find is 15780944. What should or can I do?

 

how did you come to the conclusion that its your bcm that is causing your A/C not to work

 

its electrical and i have extensively tested fuses and wires plus we also had a GM tech 2 in the car and when it tried to pull up the BCM information and kept shutting us out.

 

then yup i would put money on a bad BCM. where have you been lookin for a BCM?

 

That number is very old. We need to start out with a year first.

 

i have a 2006 Cobalt SS 2.4L

ive been looking on ebay because they have wonderful prices on BCM's

 

It is 15910666.

 

Did you have a Candi module hooked up when attempting to communicate with the BCM?

 

i dont know what that is. ive had a GM tech 2 hooked up to the OBD2 and thats about it.

how do you know for sure?

 

Yes, he is correct. You need the Candi module. I don't know what else to say about it other than it is the Candi module. He could probably provide more info.

I know that is the correct part number because I run my own GM Parts Business and logged in and looked it up in the catalog.

 

well i suppose i will just keep an eye out on ebay for one. because its stupid expensive anywhere else

 

The candi module is a 6"x4"x1" box that must be attached to the Tech2 anytime you are trying to access a module on the GMLAN network in 2004 and newer vehicles. Its same color as Tech2, would appear to be part of the cable, has a blue label that says " General Motors CANdi Controller Area Network diagnostic interface" it also has a green LED that blinks once a second when its hooked up properly. You will never access a GMLAN module with a Tech2 without the CANdi

 

it may or may not have been on there. we used it at one of my local shops, Castrol.

 

well were you able to access the powertrain options when you had the tech2 hooked up.

 

On an LSJ you can access the PCM without a CANdi.

 

really is it only the lsj that you can do that with? i always have the candi so i've never tried it without one

 

Yup, only the LSJ cars, because their PCM isnt GMLAN. Thats why they use a different Interceptor.

 

i dont remember if the powertrain was accessible or not. i dont think we tried. this is what happened. we SOMEHOW managed to make my AC compressor turn on and it ran for about 3-4 ignition cycles or car starts over a 20 hour period. like 4PM the first day and then it stopped at about 12PM the next day. somehow the guy did something and it ran for that long, he did this with the Tech 2.

 

that makes sense. this is why i'm still the apprentice lol