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SELF-CHECK DIAGNOSTICS A self-diagnostic test is used to determine that the compass mini-trip computer module is operating (1) With the ignition switch in the Off position, simultaneously depress and hold the Step button and (2) Continue to hold both buttons depressed until the compass mini-trip computer module enters the • Non-Volatile Memory Test (EEPROM) • Asic Communications Test • Vref Voltage Test. • Compass Test • J1850 Communications Test pass mini-trip computer will return to normal opera- • If no test result message is displayed, but com- pass mini-trip computer operation is still improper, • If the “FAIL” message is displayed, the compass mini-trip computer module is faulty and must be • If the “BUS” message is displayed, one or more of the required J1850 messages are not present (see • If any VFD segment should fail to light during the display segment test, the compass mini-trip com- (4) If the first five tests pass, the Compass mini- trip computer shall verify that all the required J1850 return to normal operation. The required J1850 messages are: • Dimming message • Fuel Used message • Distance Pulses message • Percentage Fuel Tank Full message • Fuel Type message • VIN (Vehicle Identification Number) • Vehicle Speed message • Engine gauge data (Coolant temperature data) NOTE: The Fuel Used J1850 message shall be NOTE: Pressing the STEP or US/M switches during NOTE: If the compass functions, but accuracy is NOTE: If the compass reading has blanked out, and REMOVAL (1) Disconnect and isolate the battery negative cable. (2) Remove the overhead console from the head- liner. Refer to Overhead Console in the Removal (3) Remove the four screws that secure the com- pass mini-trip computer module to the overhead con- (4) Pull the compass mini-trip computer module away from the overhead console far enough to access (5) Disengage the overhead console wire harness connector from the mount on the compass mini-trip (6) Disconnect the overhead console wire harness connector from the compass mini-trip computer mod- (7) Remove the compass mini-trip computer mod- ule from the overhead console housing. INSTALLATION (1) Position the compass mini-trip computer mod- ule onto the overhead console housing. 8M - 8 MESSAGE SYSTEMS AN COMPASS/MINI-TRIP COMPUTER (Continued) |