Subaru Legacy 2004 Service Manual page 3431

Step
1 CHECK FUSE.
1) Remove the fuse No. 22, 27 and 28 from
fuse & relay box.
2) Check the condition of fuse.
2 CHECK POWER SUPPLY FOR BLOWER
MOTOR.
1) Turn the ignition switch to ON.
2) Turn the blower switch to ON.
3) Measure the voltage between blower motor
and chassis ground.
Connector & terminal
(B87) No. 2 (+) — Chassis ground (
3 CHECK BLOWER MOTOR RELAY.
1) Turn the ignition switch to OFF.
2) Remove the blower motor relay.
3) Connect the battery positive (+) terminal to
terminal No. 24 of blower motor relay, and neg-
ative ($) terminal to terminal No. 23.
4) Measure the resistance between terminals
No. 21 and 22.
Terminals
No. 21 — No. 22:
4 CHECK BLOWER MOTOR.
1) Disconnect the connector from blower
motor.
2) Connect the battery positive (+) terminal to
terminal No. 2 of blower motor connector, and
negative ($) terminal to terminal No. 1.
3) Make sure the blower motor runs.
5 CHECK POOR CONTACT.
Check poor contact in auto A/C control module
connector.
Diagnostics for A/C System Malfunction
Is any fuse blown-out?
Is the voltage more than 10 V? Go to step 3.
$
):
Is the resistance less than 1
#?
Does the blower motor run?
Is there poor contact in con-
nector?
AC(diag)-19
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Check Yes
Replace the fuse.
Go to step 4.
Go to step 5.
Repair the con-
nector.
No
Go to step 2.
Repair the open
circuit of blower
motor power sup-
ply line harness.
Replace the
blower motor relay.
Replace the
blower motor.
Replace the auto
A/C control mod-
ule.