Brake controler wiring

06 TB Ext (in-line 4)

It has the factory 7-pin trailer plug on the back.

They tell me that the 4 brake controler wires are up under the dash. I have not taken the dash open to look in there yet, but anybody done this - do you know where the factory wires are?

to the lt of the brake pedal arm on my 2002.

For my '03, they are taped together with a tag showing what each does. No terminating plug.

For the controller I am using, I bought the GM harness adapter for it and cut the truck-end plug off in order to be able to plug/unplug my controller. Can try to add pics if you wish.

Hope this helps!