Subaru XT 1988 Service Manual page 1337

WIRING DIAGRAM AND TROUBLESHOOTING
6-3
Check if resistance between ground terminal
No
Repair harness between lighting relay and
of lighting relay coil and body metal is zero. body metal.
Yes
Check if continuity exists between contact
No
I
points of lighting relay when ignition switch Replace lighting relay.
is turned ON.
Yes
Check if voltage is applied to passing switch
No
Repair harness between headlight(s) and
(high and low beams) when ignition switch is
turned ON.
passing switch.
Yes
Check if continuity exists between contact
No
points corresponding to selected position of Replace passing switch.
passing switch (high-low beam).
Yes
No
Repair harness between beam switch and
Check if voltage is applied to beam switch.
passing switch.
Yes
Check if resistance between lighting switch
No
Repair harness between lighting switch and
and beam switch is zero. beam switch.
Yes
Replace beam switch.
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