check your wiring, make sure etac is plugged in and ohm out cabeling from etac card to traction controller. red wire on etac card comes from your keyswitch, black wire goes to battery negative. green and white are can bus into traction controller.
i have had a broken wire on the horn cause this before... they use one of the horn spade terminals to bridge b- to the etac card... stupid. (wire #40 should have 2 wires into horn terminal)
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