Symptom Chart

Symptom	Possible Cause	Action
Speed control inhibited or disabled	Default mode enabled Supply voltage to speed control module Supply voltage to speed control sensor Steering wheel speed control switch(s) Steering wheel speed control switch circuit Throttle sensors Brake switch	Check for Network related DTCs that could be caused by power failure to the module or sensor and refer to DTC Index . Refer to Communications Network . For steering wheel speed control switch and circuit tests. Refer to Pinpoint Test A . For engine throttle position sensor tests. Refer to Electronic Engine Controls . For brake switch tests. Refer to Pinpoint Test B .
Unable to regulate/adjust vehicle speed	Steering wheel switch malfunction	For speed control switch circuit tests. Refer to Pinpoint Test A .
Unable to cancel speed control from steering wheel	Steering wheel switch malfunction	For speed control switch circuit tests. Refer to Pinpoint Test A .
Unable to cancel speed control from brake pedal	Brake switch malfunction	For brake switch tests. Refer to Pinpoint Test B .