2007 VE Commodore BCM not communicating

[Mon-aro]

Is the battery new?

Yes 600CCA

 

[Fu Manchu]

It kind of stinks of a voltage spike.
All I can offer from here is to do a full capacitor discharge.

Disconnect negative at the battery.
Then turn on lights. All doors open. Toot the horn, press buttons, open the glove box. Press the brake a few times. Work the hand brake, start the car (turn the key). Open the boot. What ever you can find electrical, use it. Then let it sit for half an hour or so.
Put everything right again. Reconnect the negative terminal and all going well, all modules fully reboot and work correctly.

It costs nothing to do, so worth a go.

 

[lout]

im thinking you took out a fuse or fusible link
was the battery still functioning when removed or did you change it because car would not start

 

[Fu Manchu]

There is conditions where the BCM deliberately won’t communicate. I think @lout found some stuff about that on VZ.

 

[Mon-aro]

im thinking you took out a fuse or fusible link
was the battery still functioning when removed or did you change it because car would not start

im thinking you took out a fuse or fusible link
was the battery still functioning when removed or did you change it because car would not start

car was completely fine was driving daily driving it and then battery died initially in my work car park, I got a jumpstart and drove it home, the next day I brought a battery and it’s the correct battery replaced it and went to start it and then a code was in the middle screen

 

[lout]

unfortunately there are about 10 separate fuses for bcm
time to check every possible fuse and fusible link
have you tried fu's idea to disconnect battery and discharge caps and then reconnect

 

[Mon-aro]

unfortunately there are about 10 separate fuses for bcm
time to check every possible fuse and fusible link
have you tried fu's idea to disconnect battery and discharge caps and then reconnect

The car sat for few days with battery disconnected. So im sure it was dry,
Could you please point out the fuses for the BCM? will give that a try, is there is a possibility the BCM is fried?

 

[terry1971197]

Hi guys the car died after replacing the battery? now the car doesn't start, acc on car lights up and all warning lights are flashing, contact the dealer etc. Plugged the scanner in and it shows ( lost communication with the BCM ) i have another BCM with different part number somewhere in the shed should i just clone the original one? Anyone have been through this before? if so what was the resolution please? TIA

 

[lout]

very unlikely bcm is fried if you did nothing wrong
have you tried disconnecting battery again since this
will check some diagrams tomorrow for fuse numbers
is the security padlock light working

 

[Mon-aro]

very unlikely bcm is fried if you did nothing wrong
have you tried disconnecting battery again since this
will check some diagrams tomorrow for fuse numbers
is the security padlock light working

Please have a look at the video below