Subaru Legacy III (2000-2003 year). Service manual — part 875
AC-36
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
DIAGNOSTICS FOR A/C SYSTEM FAILURE (RHD MODEL)
8
CHECK BLOWER FAN MOTOR RELAY.
1) Turn ignition switch OFF.
2) Remove blower fan motor relay.
3) Connect battery positive (+) terminal to ter-
minal No. 1, negative (-) terminal to termi-
nal No. 3 of blower fan motor relay.
4) Measure resistance between No. 2 and No.
4 terminals.
Terminals
No. 2 — No. 4:
Is the measured value is less than the
specified value?
1
Ω
Replace blower
fan motor relay.
9
CHECK BLOWER FAN MOTOR.
1) Disconnect connector from blower fan
motor.
2) Connect battery positive (+) terminal to ter-
minal No. 1, negative (-) terminal to termi-
nal No. 2 of blower fan motor connector.
3) Make sure blower fan motor rotates.
Does blower fan motor rotate?
Blower fan motor rotates.
Repair harness
blower fan motor
and BPC.
Replace blower
fan motor.
10
CHECK POOR CONTACT.
Check poor contact in A/C control module con-
nector.
Is there poor contact in connector?
There is no poor contact.
Replace A/C con-
trol module.
Repair connector.
Step
Value
Yes
No
AC-37
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
DIAGNOSTICS FOR A/C SYSTEM FAILURE (RHD MODEL)
MEMO:
AC-38
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
DIAGNOSTICS FOR A/C SYSTEM FAILURE (RHD MODEL)
C: BLOWER MOTOR ROTATES ABNORMALLY
TROUBLE SYMPTOM:
Blower motor rotates abnormally.
WIRING DIAGRAM:
AC-00367
BATTERY
NO. 1
NO. 2
NO. 17
SBF-1
SBF-3
SFB-4
A15
B5
B3
A6
B36
i1
AUTO A/C
CONTROL
MODULE
A:
i49
i48
B:
i52
B1
3
2
1
BPC
7
3
2
12
B2
1
2
i52
1 2
3 4
5 6
7
8 9
10 11 12 13 14
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
B:
i49
3
4
1
2
i28
B80
B50
i20
B36
B4 B5 B6
A4 A5 A6
C5 C6
F6
D4 D5 D6
F1
H1
C4
G6
G1
C2
K1
M1 M2
K6
L1
D1 D2
A1 A2
B1 B2
I6
J6
L2
I1
J1
H6
M4 M5 M6
L4 L5 L6
N5 N6
O4 O5 O6
N4
P4 P5
N2
O1 O2
P1 P2
N3
O3
P3
P6
A3
B3
C3
E4 E5 E6
E1 E2
BLOWER MOTOR
RELAY
B50
3 4
1 2
1 2 3 4
5 6 7 8
i20
2 3
1
B1
i48
A:
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
IGNITION
SWITCH
B2
1 2
B3
1
2
1
2
1
B3
BLOWER
MOTOR
2
1
BLOWER MODULE
AC-39
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
DIAGNOSTICS FOR A/C SYSTEM FAILURE (RHD MODEL)
Step
Value
Yes
No
1
CHECK WITH MANUAL OPERATION.
1) Start the engine and turn the A/C switch to
ON.
2) Select MANUAL mode.
3) Check, if blower fan runs with HI speed
under MANUAL mode.
Does run the blower fan with HI speed?
Blower fan runs with HI speed. Go to step 2.
<Ref. to AC-34,
BLOWER MOTOR
DOES NOT
ROTATE, Diag-
nostics for A/C
System Failure
(RHD Model).>
2
CHECK WITH MANUAL OPERATION.
Check, if blower fan runs with LO speed under
MANUAL mode.
Does run the blower fan with LO speed?
Blower fan runs with LO
speed.
3
CHECK OUTPUT SIGNAL TO BPC.
1) Turn the ignition switch to OFF.
2) Remove glove box.
3) Disconnect connector from BPC.
4) Start the engine and turn the A/C switch to
ON.
5) Select MANUAL mode.
6) Measure voltage between BPC harness
connector and chassis ground with switch-
ing rotating speed of blower fan.
Connector & terminal
(B1) No. 2 (+) — Chassis ground (-):
Is the measured value same as the speci-
fied value?
LO: Approx. 0
←→
5 V, OFF:
Aprrox. 5 V, HI: Approx. 0 V
Replace BPC.
4
CHECK HARNESS BETWEEN BPC AND A/C
CONTROL MODULE.
1) Turn the ignition switch to OFF.
2) Disconnect connector from A/C control
module.
3) Measure harness resistance between BPC
and A/C control module.
Connector & terminal
(B1) No. 2 — (i49) No. 5:
Is the measured value less than the speci-
fied value?
1
Ω
Repair harness
between BPC and
A/C control mod-
ule.
5
CHECK WITH MANUAL OPERATION.
Check, if blower fan is turned OFF under MAN-
UAL mode.
Is the blower fan turned OFF?
Blower fan is turned OFF.
6
CHECK BLOWER FAN MOTOR RELAY.
1) Turn the ignition switch to OFF.
2) Remove blower fan motor relay.
3) Connect battery positive (+) terminal to ter-
minal No. 1 and battery negative (-) termi-
nal to terminal No. 3 of blower fan motor
relay .
4) Measure resistance between terminals No.
2 and No. 4.
Terminal
No. 2 — No. 4:
Is the measured value less than the speci-
fied value?
1
Ω
Replace blower
fan motor relay.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст