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3. Turn the ignition switch to the Off position. Disconnect and isolate the battery negative cable. Remove the over- head console. Check for continuity between the ground circuit cavities of the roof wire harness connector for the 4. Connect the battery negative cable. Turn the ignition switch to the On position. Check for battery voltage at the fused ignition switch output (run/start) circuit cavity of the roof wire harness connector for the overhead console. SELF- DIAGNOSTIC TEST A self-diagnostic test is used to determine that the compass mini-trip computer module is operating properly elec- 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 compass mini-trip computer module enters the display seg- ment test. In this test, all of the Vacuum Fluorescent Display (VFD) segments are lighted while the compass • Non-Volatile Memory Status (NVM) • RAM Status • ROM Status • ASIC Communication Test Status • Compass Test Status • DC Status • CAN 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: • If no test result message is displayed, but compass mini-trip computer operation is still improper, the use of T scan tool and the proper Diagnostic Procedures manual are required for further diagnosis. • If the “FAIL” message is displayed, the compass mini-trip computer module is faulty and must be replaced. • If the “PASS” message is displayed, the compass mini-trip computer module is OK, no faults are present. • If any VFD segment should fail to light during the display segment test, the compass mini-trip computer 4. If the first seven tests pass, the Compass mini-trip computer shall verify that all the required CAN bus messages are present on the CAN bus. If all required messages are present on the CAN bus, or if the ignition switch is • Dimming message • Fuel Used message • Distance Pulses message • Percentage Fuel Tank Full message • Fuel Type message • VIN (Vehicle Identification Number) • Vehicle Speed message • Last Engine Off Duration message HB OVERHEAD CONSOLE - SERVICE INFORMATION 8M - 33 |