The Lights are Off but Somebody is Home
A customer called me in to look at a Chevy Cruze that their technician was not able to program. They had replaced the BCM. After replacement the dash lights would only come on briefly then shut off after the push button was applied in this push button start vehicle. When I asked the technician, he told me that he had attempted to program the vehicle but he was unable to complete the process. My thought was that he had a programming error which killed the BCM. After working with the vehicle for a few minutes, I told the service adviser that we needed another BCM to try. He ordered one and it was installed. Same apparent issue. This time I decided to read the "instructions". Even though the path in service information was vague, it led me to believe that the BCM would program even though I was unable to get the push button to wake up the vehicle. I gave it a try. The instructions in TIS asked to turn ignition off then on. I went through the motions but the cluster remained dark. I pushed through as if it had worked normally. The module was found by the TIS software and programmed through to 100%. Still no lights on the cluster. I then went into the IMMO and did the BCM replaced function. It woke up the cluster and in 12 minutes, the car was alive again.
So if you have a late model GM product, this may be something that would throw you off when attempting to program a new BCM. I hope this helps others to program these modules more smoothly.
I ran into this issue on a 2013 xts. Same exact thing you describe.i was freaking out at first tho because it was my bosses car Lol. Also did a bcm in a 2013 camaro and it did the same thing.
Hey Mike That’s a great tip. I have run across the odd vehicle where you can’t communicate with the module “until it’s programmed”. yes this is against the “normal rule of thumb “in order to program a module you must be able to communicate with it” When you get vehicles like this .... I find that in service information/TSB’s/Remove and replace procedures is where you find that valuable…
Chevy dead BCM’s. Just like the no start suburban/Tahoe/Silverado. Dead no com until programmed. I think the diff is they don’t have dead clusters.
Hi Mike, I sometimes don't read the instructions until I run into a problem. In this case . the factory information would be of help and if the aftermarket SI is not helpful it should be updated. GM SI----->Quick links at the top - Control Module References - K9 Body Control Module Programming and Setup - Document ID: 2173651 To program a replacement K9 Body Control Module (BCM), perform…
"For Push Button Start System, begin with the vehicle in vehicle OFF power mode" How can you see what power mode you are in if the BCM is no-comm?
Hi Geoff, Sounds counter-intuitive, right? The part of the statement you put up was not complete, as the next part tells you what happens - The Service Programming System will powermode the vehicle. This only would apply to what Mike was describing with his vehicle and trying to replace, program, and set-up a NEW BCM. If there's a DOA BCM that would be addressed differently. Did this answer…
No, I read all what you said the first time.....So, do you just assume it is OFF? We have only seen a handfull of push button cars out here, so without feedback from the BCM, IDK how you can be sure it is definitely OFF before you begin to let the SPS take over.
Scott, Yes, I read this in SI. The SPS software is what tells you to cycle key even though it does not work with push button.
The G.M. modules that you can't communicate with until they are programmed have been shipped without an operating system installed from the vendor. There are several PI's addressing this.
Hi James: These PIs that you speak of. Where does one find them and not just a handful? (I know but others may not.) Guido
I've seen this for over 10 years with G.M. replacement modules, usually TCM or EBCM's. S.I. has had several P.I.'s over the years. Many have expired and I took a quick look and found one.... PIC3635F
Hi James: Thanks for the response. While not the answer that I was hoping you would give, you did touch on it through. The answer is that you find them in S.I. It seems that a lot of people are either deluded into thinking that PIs, GSM, RRTs, etc. are available in aftermarket service information or they don't need it/they're not worth the money to get them. Many (most?) aftermarket service…