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(2) is depressed for more than one second with the ignition switch in the On position, the trip computer information DIAGNOSIS AND TESTING COMPASS MINI-TRIP COMPUTER If the problem with the compass mini-trip computer is an inaccurate or scrambled display, refer to SELF- DIAG- For complete circuit diagrams, refer to the appropriate wiring information. The wiring information includes wir- 1. Remove the overhead console from the headliner (Refer to 8 - ELECTRICAL/OVERHEAD CONSOLE - REMOVAL). 2. Check for battery voltage at the overhead console electrical connector. If OK, go to Step 3. If not OK, Check for battery voltage at the appropriate B(+) fuse in the Integrated Power Module (IPM), repair the open fused B(+) 3. Turn the ignition switch to the On position. Check the fused ignition switch output circuit(s) at the overhead con- sole electrical connector. If OK, go to Step 4. If not OK, repair the open or shorted circuit as required. 4. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Check for continuity between the ground circuit cavity of the overhead console electrical connector and a good ground. There should SELF- DIAGNOSTIC TEST A self-diagnostic test is used to determine that the EOM is operating properly electrically. Initiate the self-diagnostic NOTE: The compass mini-trip computer self - test can also be performed using a scan tool. Refer to Auto 1. With the ignition switch in the Off position, simultaneously depress and hold the STEP and RESET buttons while rotating the ignition switch to the Run/On position. 2. Continue to hold both buttons depressed until the EOM enters the display segment test. In this test, all of the Vacuum Fluorescent Display (VFD) segments are lighted while the EOM performs the following checks: • Non-Volatile Memory Status (NVM) • RAM Status • ROM Status • ASIC Communication Test Status • Compass Test Status • DC Status • PCI data bus Communications Test NOTE: If module is equipped with the Universal Transmitter, the module also checks “Universal Transmitter 3. Following completion of these tests, the compass mini-trip computer will display one of two messages: “FAIL” or “PASS.” Press RESET or STEP to exit and enter normal mode. Respond to these test results as follows: 8M - 28 OVERHEAD CONSOLE - SERVICE INFORMATION DR/DH |