Seville V8-300 4.9L (1991)
Driver/Vehicle Information Display: Symptom Related Diagnostic Procedures
Bulletin No.
T-91-44A
File in Group
8
Number
132
Corp. Ref. No.
118102
Date
March, 1991
SUBJECT:
VACUUM FLUORESCENCE DISPLAYS FLICKER OR GO BLANK POSSIBLY SETTING A CODE E047
MODELS AFFECTED:
1986-1991 ELDORADOS AND SEVILLES
This bulletin supersedes Service Bulletin T-91-44, Group 8, which should be discarded. This bulletin is being revised to correct art work.
Some 1986-1991 Eldorados and Sevilles may experience a condition of vacuum florescence displays flickering or going blank with a code E047 possibly
being set. This may be the result of a loss of power or ground to the Instrument Panel Cluster (IPC), Climate Control Driver Information Center
(CCDIC), or radio.
The Central Power Supply (CPS) provides power (7 and 12 volts) and ground to the IPC, CCDIC, and Body Control Module (BCM). If the BCS4 loses
power from the CPS, the ECC will not respond to key selections and twilight sentinel will become inoperative. Within the IPC there is a regulator which
provides 55 volts for the Vacuum Fluorescence (VF) displays of the IPC, CCDIC, and 16 volts to the radio. If the IPC loses power from the CPS, the
IPC and CCDIC VF displays will go blank. The VF displays will also go blank if the IPC, CCDIC, or radio experience an internal condition which will
cause the regulator within the IPC to turn off to protect itself.
Figure 1 - Vacuum Fluorescence Displays Flicker Or Go Blank Diagnosis
