Subaru XT 1988 Service Manual page 1369

WIRING DIAGRAM AND TROUBLESHOOTING
6-3
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FAULTY POWER STEERING FLUID HEATER CIRCUIT
Turn ignition switch OF F.
No
: Replace heater. J
Check if resistance of fluid sensor is O.5!1.
Yes
I Yes
Check if fusible link is burned.
: Replace fusible link.
I
I
No
No
: Repair connections or harness.
I
Turn ignition switch ON.
Check if 12 volts are produced at terminal
BW of heater relay body harness connector.
No
: Repair connections or harness.
J
Check if 12 volts are produced at terminal W
of heater relay body harness connector.
Yes
Connect terminal BY of heater relay body
harness connector to ground.
No
I
Replace heater relay.
I
Check if 12 volts are produced at terminal B
of heater relay body harness connector.
Yes
Disconnect terminal BY of heater relay
body harness connector from ground.
No
-I
Repair connections or harness.
I
Check if continuity exists between BY and B
terminals of heater relay and their
corresponding terminals of signal controller.
Yes
Replace signal controller.
97