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8M - 2
MESSAGE SYSTEMS
OVERHEAD CONSOLE (Continued)
Fig. 1 CS Overhead Console
1 - Storage Bin Door
2 - Reading/Courtesy Lamps
dures found in this section may be required to
restore proper compass operation.
Following are general descriptions of the major
components used in the overhead console. Refer to
Instrument Cluster for more information.
DIAGNOSIS AND TESTING - OVERHEAD
CONSOLE
The most reliable, efficient, and accurate means to
diagnose the overhead console or related system
requires the use of a DRB III scan tool and the Ser-
vice and Body Diagnostic Procedures Manuals. The
DRB III scan tool can provide vital information to
the technician trying to find a problem with a over-
head console component. Diagnostic logic is built into
the overhead console mounted module to help the
person trying to locate the problem by the most effi-
cient means possible. Anytime a problem is sus-
pected, a DRB III
scan tool must be obtained and
used to retrieve any stored fault codes in the module.
If diagnostic fault codes are present in the module,
record them on a piece of paper immediately before
proceeding any further. Then, use these fault codes to
identify the problem by verifying the fault code.
Example, If the module records "TIRE PRESSURE
N/A" fault, locate the diagnostic procedure for this
code in the appropriate Body Diagnostic Procedures
Manual and follow the flow chart until the specific
problem is located and resolved. Once the problem is
thought to be corrected, erase the stored fault code
using the DRB III scan tool and verify correct sys-
tem operation. If the tire pressure monitoring system
is functioning correctly, verify that there are no other
stored codes in the module and return the vehicle to
service.
If the fault code could not be verified, such as not
finding anything wrong when following the diagnos-
tic flow chart in the Body Diagnostic Procedures
Manual. This is a good indication that a INTERMIT-
TENT problem may be present. You must than
attempt to find the intermittent problem, such as
running a tire pressure monitoring system self test.
Refer to the Tires/Wheels section for more informa-
tion. Always, eliminate all other potential problems
before attempting to replace the module.
TESTING VOLTAGE AND GROUND SUPPLY TO
OVERHEAD CONSOLE
(1) Remove the overhead console from the head-
liner (Refer to 8 - ELECTRICAL/OVERHEAD CON-
SOLE - REMOVAL) Disconnect the overhead console
electrical connector. Check the fused B(+) circuit in
the overhead console electrical connector. If OK, go to
Step 2. If not OK, repair the open circuit or compo-
nent as required. Refer to the Wiring section for
detailed schematics.
(2) Check the IGN RUN B(+) circuit in the over-
head console electrical connector. If OK, go to Step 3.
If not OK, repair the open IGN RUN B(+) circuit as
required.
(3) Check the Ground circuit in the overhead con-
sole electrical connector. If OK, go to Step 4. If not
OK, repair the open ground circuit as required.
(4) If the tire pressure monitoring system is not
operating properly, replace the module with a known
good unit and retest the system. Refer to the Tires/
Wheels section for more information on the tire pres-
sure monitoring system.
NOTE: If the compass functions, but accuracy is
suspect, it may be necessary to perform a variation
adjustment. This procedure allows the compass
unit to accommodate variations in the earth's mag-
netic field strength, based on geographic location.
Refer to Compass Variation Adjustment in the Stan-
dard Procedures section of this group.
NOTE: If the compass reading displays dashes, and
only "CAL" appears in the display, demagnetizing
may be necessary to remove excessive residual
magnetic fields from the vehicle. Refer to Compass
Demagnetizing in the Standard Procedures section
of this group.
CS
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