Entering On-Board Test Mode: 3-Series

Turn ignition switch to LOCK position. Press and hold trip odometer reset button then turn ignition switch to RUN position. Trip odometer should display "tESt" followed by a 2-digit number. With each subsequent press of reset button, the next higher test is selected. If the reset button is not pressed again within one second, the corresponding test is carried out. This causes "tESt" to disappear from the odometer display.

Test number continues to be displayed on right side of odometer display. When the button is pressed again, the prevailing test function is interrupted. Trip odometer will now display "tESt" again and the test number continues to increase. Once the last test has been reached (test 15), system restarts from beginning.

TEST 05 through TEST 14 are only executed if test 15 is switched to L OFF position. See TEST 15: LOCK OFF/LOCK ON  . When TEST 15 is selected, test function is activated to L ON. In lock on mode, only dashes are displayed in the odometer display followed by test number (----- 07). TEST 01 to TEST 04 are also executed with lock on.

Termination criterion for TEST 01 to TEST 15: turn ignition switch to LOCK position, or selection of TEST 00. Apart from TEST 01, which terminates automatically after the indicator test, TEST 02 to TEST 14 can also be selected when vehicle is in motion.