The centralised EOBD tester input is built into Body Computer M001, connector I. It is supplied directly by the battery at pin 16, via a line protected by fuse F039 of underfacia junction unit B002. Pins 4 and 5 are earthed.The pins of diagnostic connector I of Body Computer M001 are internally connected to the pins present in the other control unit connectors that interface on different areas of the car (facia, front, rear etc.).Each performs a specific function:
pin 1: tests braking system control unit M051 by means of a signal from pin 16 connector A of Body Computer M001, externally connected to pin 6 of brake system control unit M051.
pin 3: tests air bag control unit M060 by means of a signal from pin 12 connector D of Body Computer M001, externally connected to pin 19 of connector A of air bag control unit M060.
pin 7: tests engine control unit by means of a signal from pin 20 connector A of Body Computer M001, externally connected to pin 53 of connector A of engine control unit M010.
pin 9 :tests the control units in the facia area, i.e. headlamp alignment correct control unit M073 and servotronik control unit M088. A self-diagnostic signal reaches headlamp alignment corrector control unit M073 (pin 5) and servotronik control unit M088 (pin 4) via pin 11 connector D of Body Computer M001, externally connected, via short-circuiting junction D097 C.
pin 13 :tests the control units in the rear area, i.e. electric brake control unit M059 and controlled suspension control unit M046. A self-diagnostic signal reaches electric brake control unit M059 (pin 3) and controlled suspension control unit M046 (pin 8) via pin 18 connetor F of Body Computer M001, externally welded.