Description of On-Board Diagnostics

The EMIC also has a self-diagnostic actuator test capability, which will test each of the CCD bus message-controlled functions of the cluster by lighting the appropriate indicators and positioning the gauge needles at several predetermined locations on the gauge faces in a prescribed sequence.

See the owner's manual in the vehicle glove box for more information on the features, use and operation of the EMIC.


The gauges are diagnosed using the EMIC self-diagnostic actuator test. Proper testing of the CCD data bus and the data bus message inputs to the EMIC that control each gauge require the use of a DRB III scan tool. Refer to the appropriate diagnostic information. Specific operation details for each gauge may be found elsewhere in this service information.With the ignition switch in the ON or Start positions, voltage is supplied to all gauges through the instrument cluster electronic circuit board. With the ignition switch in the OFF position, voltage is not supplied to the gauges. The gauges do not accurately indicate any vehicle condition unless the ignition switch is in the ON or Start positions.

Proper testing of the EMIC, its programming, and the CCD data bus chime request message functions requires the use of a DRB III scan tool. Refer to the appropriate diagnostic information.

Body Control Module
Information Bus