Block Circuit Diagram

1. Alpha-numeric display
2. On-Board Computer
3. Engine hood and radio contacts
4. Digital Motor Electronics
5. Remote control
6. Encoding
7. Horn/relay box
8. Horn
9. Immobilizing device
10. Gong signal
11. Not used
12. Tank (immersed level sensor)
13. Outside temperature sensor
14. Diagnosis plug

The operating principals and functions are similar to OBC II (2nd generation).

The order and number of OBC displays shown in the CC display may be selected in any sequence.

Numerical input may be done in any order using the 1000, 100, 10 and 1 buttons. Each time a button is pressed the value of that digit increases by 1. When a 9 is selected a 0 will follow when the button is pressed again. If one of these buttons is held down the digit will automatically increase by 1 every .5 second.

In ignition position 0 the time or date will be displayed if that button is pressed. Other functions are only possible in position 1.

In the event of a loss of battery power to the OBC module, all data stored will be lost except for CODE (if one was entered).

A photo-transistor automatically varies the brightness of the LCD display in accordance to the overall light level in the car.

LED's are provided as reminders when these functions are selected; TIMER, LIMIT, CODE.
The OBC module also controls a gong to bring attention to certain displays, and power to the Motronic Control Unit in the CODE function.