Subaru Legacy 2002 Service Manual page 3180

DIAGNOSTICS FOR A/C SYSTEM FAILURE (LHD MODEL)
No.
1 CHECK FUSE.
1) Remove No. 2 and No. 17 fuses in joint
box.
2) Check condition of fuses.
2 CHECK POWER SUPPLY TO BLOWER FAN
MOTOR.
1) Turn ignition switch to ON.
2) Turn blower switch to ON.
3) Measure voltage between blower fan motor
and chassis ground.
Connector & terminal
(B87) No. 1 (+) — Chassis ground (−):
3 CHECK BLOWER FAN MOTOR RELAY.
1) Turn ignition switch to OFF.
2) Remove blower fan motor relay.
3) Connect battery to No. 1 and No. 3 termi-
nals of blower fan motor connector.
4) Measure resistance between No. 2 and No.
4 terminals.
Terminals:
No. 2 — No. 4
4 CHECK BLOWER FAN MOTOR.
1) Disconnect connector from blower fan
motor.
2) Connect battery to connector terminals of
blower fan motor.
3) Make sure that blower fan motor is oper-
ated.
5 CHECK POOR CONTACT.
Check poor contact in A/C control module.
Step
Are any of the fuses blown-
out?
Is the voltage more than 10
V?
Is the resistance less than
1 Ω?
Does the blower fan motor
operate?
Is there poor contact in A/C
control module?
AC-37
HVAC System (Auto A/C) (Diagnostics)
Check Yes
Replace fuse.
Go to step 3.
Go to step 4.
Go to step 5.
Repair poor con-
tact in A/C control
module.
No
Go to step 2.
Repair open cir-
cuit in harness for
blower fan motor
power supply line.
Replace blower
fan motor relay.
Replace blower
fan motor.
Contact with your
Subaru distributor
service.