It is necessary to perform both vehicle self-tests to test the complete system. Self-Test A Hold in the trip odometer reset button while turning the ignition key to run will start a self-test, with a readout on the odometer. It will also activate the instrument panels, one at a time. The test will run for approximately 60 seconds, then automatically shut down. If the test senses a fault, the odometer will show the P-code number for the corresponding (DTC) Diagnostic Trouble Code. This self-test procedure will only test the (MIC) Mechanical Instrument Cluster and the communication with the (BCM) Body Control Module. You will not get engine or transmission fault codes. It does not test the entire vehicle. Self-Test B 1. Cycle the ignition key On - Off - On - Off - On within 5 seconds. 2. The odometer will show the P-code for the corresponding Diagnostic Trouble Code number. 3. If no DTC's are present, the cluster will display either: A. "P1684" and "done" B. Or, only "done" P1684 does not indicate a problem; it's only a status, which indicates that the PCM memory has been cleared within the last 50 ignition cycles. "Done" indicates that no DTC's are present and the procedure is complete. P0700 indicates that there are faults on the TCM, which must be read. Diagnostic Trouble Code Descriptions Notes - Some owners have reported experiencing malfunction codes similar to FL 0005, EE 05, and BL 01 during the start of the instrument gauge (Test A) self-test. These are not MIL codes. The readouts simply represent PCM software version information: FL0002 - Display Application Code Level EE 02 - Display EEPROM version bL 01 - Display Boot Loader version SWVE 200 - Communication Protocol and version CAN VER 431 - Communication Protocol and version LIN VER 429 - Communication Protocol and version Please review a breakdown of the different DTC's here (PDF). Source: Service Manual
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