Porsche 928 Workshop Manual page 60

929
Maintenance, Self-diagnosis
03
a
InMate the testing step for the air-conditioning
control to the LH control unit (terminal 14).
Display:
Initiate the testing step for speed reduction on
automatic vehicles.
Display:
l
Set the air distribution slide switch to up /
down.
Switch on the air-conditioning system briefly
(AC pushbutton). The LED must go out and
the following display will appear.
0
Note:
This testing step does not apply to vehicles
with manual gearboxes.
Press the green key until the clear symbol ap-
pears.
After a short period, the display 1000 will ap-
pear, i.e. output terminated.
Switch off the ignition
The functional check of actuator and input sig-
nals is thus terminated
If this is not the case, there may be a fault in
the wiring. In the event of an error, check with
reference to the circuit diagram.
Move the selector lever from the P or N posi-
tion to a drive position. The LED must go out
and the following display will appear.
Display:
0
Functional check of actuator and input signals
03- 11
Prfnted In Germany - Xx, 1988