Symptom Chart

NOTE: Always check ZONE and calibration (CAL) adjustments before replacing the compass sensor module; refer to General Procedures.

SYMPTOM CHART

Condition	Possible Sources	Action
The compass is inaccurate	ZONE setting. Compass calibration. Vehicle magnetism. Compass sensor module.	Go To PINPOINT TEST A .
No communication with the message center - F-Series Superduty	Fuse. Circuitry. Message center.	Go To PINPOINT TEST B .
No communication with the message center - Excursion	Fuse. Circuitry. Message center.	Go To PINPOINT TEST C .
Not all segments of display illuminate	Message center.	INSTALL a new message center. If Excursion, REFER to MESSAGE CENTER - EXCURSION . If F-Superduty, REFER to MESSAGE CENTER - F-SUPER DUTY . TEST the system for normal operation.
The distance to empty (DTE)/average fuel economy is inoperative/incorrect - F-Series Superduty	Circuitry. Fuel level sensor and pump. Message center. Vehicle speed signal. Powertrain control module (PCM).	Go To PINPOINT TEST D .
The distance to empty (DTE)/average fuel economy is inoperative/incorrect - Excursion	Circuitry. Fuel level sensor and pump. Message center. Vehicle speed signal. Powertrain control module (PCM).	Go To PINPOINT TEST E .
The message center display is blank	Fuse. Circuitry. Message center. Message center all off option.	With ignition ON, depress the mode button. If still no display, for F-Super Duty, Go To PINPOINT TEST B ; for Excursion, Go To PINPOINT TEST C .
The outside air temperature is inaccurate/inoperative	Outside temperature sensor. Circuitry. Message center.	Go To PINPOINT TEST F .