Instrument Cluster Display - Diagnostics

91cadillac01

Bulletin .No. T-91-38
File in Group 8
Number 130
Corp. Ref. No. 018126
Date Jan. 1991


SUBJECT: VACUUM FLUORESCENCE DISPLAYS FLICKER OR GO BLANK


MODELS AFFECTED: 1985-1991 DE VILLES AND FLEETWOODS


Some 1985-1991 DeVilles and Fleetwoods may experience a condition of vacuum florescence displays flickering or going blank and the Electronic Climate Control (ECC) blower going off. This may be the result of a loss of power or ground to the Body Control Module (BCM) or an internal problem with the Digital Instrument Cluster (DIC), ECC, Fuel Data Panel (FDP), or ECC power module/blower.


Within the BCM there is a regulator which provides 16 volts for the Vacuum Fluorescence (VF) displays of the DIC, FDP, and ECC. This regulator also provides the variable voltage input to the ECC power module for blower speed control.





To diagnose and repair these conditions use the following trouble tree.