Subaru XT 1988 Service Manual page 1407

WIRING DIAGRAM AND TROUBLESHOOTING
6-3
No No
Depress the brake pedal to see if
Check if the stop light bulb is
J
I
the stop light goes on. broken.
I
Replace the stop light switch.
Yes
~
Yes
I
Replace the bulb.
With the brake pedal released,
check if the battery voltage
No
appears at the terminal of the Replace the brake switch.
harness connector for the cruise
control unit.
Yes
Yes
Replace the cru ise control unit,
and check if it operates normally.
Replace the cruise control unit.
No
Again install the old control unit,
Yes
J
Replace the actuator.
replace the actuator, and see if it
operates normally.
No
Again install the old actuator,
Yes
replace the valve, and see if it Replace the valve.
operates normally.
No
Again install the old valve, reo
Yes
place the pump, and see if it ope- Replace the pump.
rates normally.
No
Check wiring harness and hoses.
135