2009 Tahoe - Traction/Stabilitrac/ABS/Brake Lights

[bigdjatom416]

My 2009 Tahoe has Traction/ABS/Brake lights lit. Scanner won’t communicate with the ABS Controller so I can’t read codes. This made me think the controller is bad. I have checked fuses, cleaned and reseated the ground. Not sure what to check next. Brakes are new, just did front bearings with new ABS sensors. I was thinking of putting new sensors in the rear but since the scanner doesn’t communicate with the controller I’m not sure that will fix. Help please!!

 

[mikez71]

Did this happen after changing the ABS sensors? Or there before?
And can you communicate with your ECM/TCM? Or nothing at all?

 

[bigdjatom416]

Did this happen after changing the ABS sensors? Or there before?
And can you communicate with your ECM/TCM? Or nothing at all?

No communication with ECM/TCM. Scanner doesn’t see that it’s connor the truck.

 

[mikez71]

Do your cigarette lighters work? (I think they are the same fuse as power to the DLC)

 

[bigdjatom416]

Do your cigarette lighters work? (I think they are the same fuse as power to the DLC)

Yes lighter plugs are working.

 

[mikez71]

And your scanner pic seems to say that the connector itself is OK...

Dunno.... but here is a wiring diagram in the meantime..

Information Bus — 2009 Chevrolet Tahoe 4WD V8-5.3L Service Manual | Operation CHARM

Detailed repair manual for the 2009 Chevrolet Tahoe 4WD V8-5.3L.

charm.li

Overview

Information Bus: Description and Operation — 2009 Chevrolet Tahoe 4WD V8-5.3L Service Manual | Operation CHARM

Detailed repair manual for the 2009 Chevrolet Tahoe 4WD V8-5.3L.

charm.li

and troubleshooting guide..

https://charm.li/Chevrolet/2009/Tahoe 4WD V8-5.3L/Repair and Diagnosis/Powertrain Management/Computers and Control Systems/Information Bus/Testing and Inspection/Symptom Related Diagnostic Procedures/Scan Tool Does Not Communicate with Low Speed GMLAN Device/

"An open in the DLC ground circuit terminal 5 will allow the scan tool to operate but not communicate with the vehicle."

 

[BoredWithHondas]

How was this sorted? Set on fire?