These are the codes it has
I have a 2000 suburban scanner wont communicate to pull codes or data unless I use a jumper wire at the splice pack g205 under the steering column... I'll try to post a video of what my truck is doing... with the codes its throwing it shouldn't be able to start and run but it does run n fine just the dash looks like an airplane with all the lights on... I changed ignition switch, tried the cluster, then when I disconnected the bcm the truck started and stayed running with no issues, and then I unplugged the 3 wires on top the ignition lock cylinder it still ran with no issues... I checked all fuses, all good. Checked all grounds all good..THANK YOU FOR YOUR HELP AND ADVICE IN ADVANCED.

 

Check for a burned-out fuse labeled "Cigar". Happened on my 2004 Suburban.

 

All fuses are good.. I'm getting power at the obd2 plug and it powers my scanner.. just wont communicate with any modules on it unless I use a jumper wire at the g205 ground splice pack

 

to clarify: how many are offline.... are all modules off line without the jumper and all are online with the jumper?

 

With the purple wire jumped to the dark green im able to communicate with the ecm and bcm only

 

All are offline until I use the jumper wire.. I checked the grounds in the frame by the abs module, the ground behind the passenger side head.. all are ok

 

if the class 2 data line wire to the dlc is open you will not be able to connect to the scan tool. the truck will have at least 6 modules...most module power and grd sources are not shared. since you have lost all modules and the class 2 data lines are wired in series at splice 205....and you jumped a open and they now communicate

disconnect the splice from all modules and check continuity on the dlc pin 2 to each output at the splice.

 

Ok I'll check that today. Thanks

 

I'm only getting continuity at pin a which is the purple pin. The others are dead..

 

Just noticed today that with key off I can get data from the bcm