Subaru XT 1988 Service Manual page 1406

6-3
WIRING DIAGRAM AND TROUBLESHOOTING
(1) Cruise control will not operate (Car speed cannot be set)
Check if fuses in the fuse
Yes
Check the cause and replace the
fuse.
(The circuit is not live.)
box is blown.
No
Check if power is supplied to the
No
control unit with the main
Replace the main switch.
switch turned on.
Yes
No
Properly ground the control
Yes
Check if the control unit is pro-
perly grounded.
unit, then check if it operates Defective grounding.
normally.
Yes
No
Check if the set signal is
The car speed sensor is defec-
transmitted from the sub-switch
No
I Replace the switch.
, -
tive. Replace the sensor inside
to the control unit_
the speedometer.
Yes
Check if the car speed pulse is
No
Check if the speedometer pro-
No
Properly connect the connec-
i - - -
tors and such, including the
transmitted to the control unit. perly indicates the car speed.
speedometer.
Yes Yes
Faulty contact of the pulse
signal cable connecting the
speedometer to the cruise
control unit.
MT vehicle:
No
MT vehicle:
Check if the clutch switch ope-
Replace the clutch switch.
rates normally.
Yes
To be continued on next page.
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