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BCM EEPROM Goodness or How to add OEM remote start

25661 Views 39 Replies 13 Participants Last post by  pinstripebob
For 2011-2015 Cruzes and 2016 Cruze Limiteds made in the United States and Australia that do not have remote start enabled only.

In my quest to find a way to add factory remote start to my 2011 Cruze, (and my side quest for a cure for a bad case of boredom mixed with inquisitiveness), I took a look at a BCM pulled from a 2014 Cruze with remote start.

The first thing I did was immediately investigate the internals. It didn't take long to find an 8 pin 24C16WT sitting by itself. A quick google search revealed that it was the eeprom I was looking for.

Digging out my recently replaced usb reader and adapter clip, I hooked it up to my Surface Pro and read the chip. Just like the radio silver boxes, it comes out mostly as random gibberish but 3 things are in clear text format:

1) the BCM's serial number
2) the donor car's VIN
3) what appears to be a 4 digit security code

I switched the vin to match that of my car and swapped it out. While the new BCM did trigger the anti-theft start lock out and threw a fit about my TPMS needing to be serviced, my car did not outright reject the "new" unit. I was able to access the setting menu through my radio and immediately I noticed a new setting for Remote Start Auto Heated Seats (sorry, can't remember the section name). Remote start itself did not appear in the appropriate section, but I ignored that as I wasn't 100% certain I had the right hood latch in my Cruze.

The next thing I decided to try was cloning my original BCM's eeprom and see what happened. I made backups of both chips, then flashed my 2011 dump to the 2014. A quick reassemble and the new bcm was plugged back in.

This time the results were a bit different:

1) the reported mileage had changed and now matched what I knew was the current amount
2) the anti-theft lock out did not trigger and I was able to start my car right up
3) it still showed the setting for the remote start heated seats

So while it probably was to be expected that the vehicle's mileage would be stored in the chip, it's interesting that the resistor value for our keys is also stored there and both are able to be transferred over without affecting the options programmed into the BCM at the factory.
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Now to figure out how to expand on this to get a manual transmission to work with it... hmmmm.
I just had some more fun with this project. I updated my original 2011 BCM with the newest calibrations & software available using the VIN of a 2011 Cruze with remote start through the AC Delco TDS system. It definitely updated my BCM, as installing it provided me with an actual configuration setting through my radio to enable/disable remote start. With a 2014 Cruze remote start compatible hood latch installed, it would not work and my car would report the hood ajar. Switching to a 2011 cruze specific hood latch taken from a non-remote start enabled vehicle ended the hood ajar error and allowed remote start to function.

So here are the requirements to add factory remote start to a Gen 1 Cruze:

2011 Cruze ONLY- a bcm programmed for remote start pulled from a 2011 cruze, or your original bcm reprogrammed using the vin from a remote start enabled 2011 cruze and key fobs that support remote start or onstar module programmed for remote start.

2012-16 Cruze - a bcm programmed for remote start pulled from a donor vehicle, or your original bcm reprogrammed using the vin from a remote start enabled cruze, remote start compatible hood latch (P/N: 95463828 or 42522220) and key fobs that support remote start or onstar module programmed for remote start.
So when you updated the 2011 BCM with new software for a VIN with remote start you didn’t get VIN mismatches?
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