BMW SERIE 3 COUPE 2000 Manuel du propriétaire télécharger pdf (Page 168)

166n

Self-diagnostics

All of the important electrical and elec-

tronic systems in the vehicle are tested

regularly and automatically – the driver

does not have to perform any extra op-

erations or adjustments.

The indicator lamps also come on briefly

after the ignition has been turned on.

While you are driving, the functional

status of the actuator motors (for the

windshield wipers, power windows,

seats, sunroof, etc.) is constantly ana-

lyzed by current measurements in their

relays.

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In the same manner, the electrical resis-

tance of the airbag ignition generators

and all of the remaining airbag compo-

nents is measured at all times. Any fault

in this system would be detected imme-

diately by a current fluctuation that

would necessarily accompany it. The

fault would be indicated immediately by

the airbag warning lamp.

Even after you shut off the engine, the

overall functional status of your vehicle

is monitored. For example, all of the

flaps of the heating and ventilation sys-

tem travel to the nearest limit position.

This action ensures that the system will

be able to provide defrosting, regard-

less of other circumstances (if a mal-

function in the heating or ventilation

system should occur during the night

while the vehicle is parked, for in-

stance).

A calibration cycle runs every tenth time

the engine is shut off. During this cycle,

the actuator motors of all the heating

and ventilation flaps travel to their limit

stops in both directions. The limit posi-

tions and the return travel paths are

checked in this manner in order to en-

sure that appropriate adjustments for

the operating elements can be made at

any time.

You will hear the sounds of the air flaps

as the heater/ventilation system carries

out its self-diagnostic functions after

the ignition is shut off. All of the other

self-diagnostics functions operate si-

lently in the background.

Any faults detected during these self-

diagnostics can be read out by your

authorized BMW center during the next

regularly-scheduled maintenance and

corrected with a minimum of time.

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