Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the message center module - with overhead console	Central junction box (CJB) fuses: 3 (7.5A) 16 (15A) J1850 Standard Corporate Protocol (SCP) network Circuitry Message center module	Go To PINPOINT TEST A .
The message center is not operating correctly - with electronic cluster	Central junction box (CJB) fuses: 23 (10A) 14 (10A) Circuitry Fuel level sender Message center switch Instrument cluster	Go To PINPOINT TEST B .
The message center is not operating correctly - with overhead console	Central junction box (CJB) fuses: 3 (7.5A) 16 (15A) Circuitry Message center module	Go To PINPOINT TEST C .
The compass is inaccurate.	Zone setting Calibration Vehicle magnetization Circuitry Message center module	Go To PINPOINT TEST D .
The compass does not operate correctly	Central junction box (CJB) fuse 16 (15A) Message center module Circuitry	Go To PINPOINT TEST E .