Circuit/System Verification

IMPORTANT: Repair any brake system related symptoms and DTCs before performing this diagnostic.

Ignition ON, cruise on/off switch ON, rotate the steering wheel to both steering stops while activating each cruise control switch separately. With a scan tool, observe all cruise control switch parameters in the ECM/PCM. Verify that each cruise control switch activated and that each displayed switch position parameters do not match or reads Invalid, as the steering wheel is turned.

If the parameters match with each depressed switch accordingly, go to Diagnostic Aids.