Dakota 2WD V8-4.7L VIN J (2005)
Driver/Vehicle Information Display: Testing and Inspection
Overhead Console
NOTE: The overhead console data is obtained from several components on the Controller Area Network (CAN) Data Bus circuit. The overhead
console will not function properly if the bus messages from any of these components is not receive. If no overhead console data is displayed, check the
CAN Data Bus circuit communications, the Instrument Cluster functions and the Front Control Module (FCM).
The most reliable, efficient, and accurate means to diagnose the overhead console or related system requires the use of a scan tool and the appropriate
diagnostic information. The scan tool can provide vital information to find a problem with a overhead console component. Diagnostic logic is built into
the Electronic Overhead Module (EOM) to help locate the problem by the most efficient means possible. Anytime a problem is suspected, a scan tool
must be used to retrieve any stored fault codes in the EOM. 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 EOM records
"B1034 - INFRARED TEMPERATURE SENSOR INPUT CIRCUIT LOW" fault, locate the diagnostic procedure for this code in the appropriate
diagnostic information 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 scan tool and verify correct system operation. If the temperature reading 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 diagnostic flow chart in the appropriate diagnostic
information. This is a good indication that an INTERMITTENT problem may be present. You must than attempt to find the intermittent problem, such
as loose or corroded wire connections, shorted wire harnesses, or similar wiring problems. Always, eliminate all other potential problems before
attempting to replace the EOM.
The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector
pin-out information and location views for the various wire harness connectors, splices and grounds.
TESTING VOLTAGE AND GROUND SUPPLY TO OVERHEAD CONSOLE
1. Remove the overhead console from the headliner. 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 component as required.
2. Check the IGN RUN B(+) circuit in the overhead 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 console electrical connector. If OK, go to the appropriate diagnostic information for final diagnosis. If
not OK, repair the open ground circuit as required.
NOTE:
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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 magnetic field strength, based on geographic location.
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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.
