Subaru Legacy III (2000-2003 year). Manual - part 881
AC-60
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) (LHD
MODEL)
6
CHECK AUTO A/C CONTROL MODULE SIG-
NAL VOLTAGE.
1) Turn the ignition switch to ON.
2) Turn the mode control dial and measure
voltage between auto A/C control module
harness connector and chassis ground for
each mode.
Connector & terminal
(i48) No. 2 (+) — Chassis ground (
−−−−
):
Is the measured value within specified
value?
HEAT, D/H, DEF: 5 V, VENT,
BI-LEVEL: 0 V
7
CHECK AUTO A/C CONTROL MODULE SIG-
NAL POWER SUPPLY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from mode door
actuator.
3) Turn the ignition switch to ON.
4) Measure the voltage between mode door
actuator harness connector and chassis
ground.
Connector & terminal
(B77) No. 5 (+) — Chassis ground (
−−−−
):
Is the measured value within specified
value?
5 V
8
CHECK HARNESS BETWEEN AUTO A/C
CONTROL MODULE AND MODE DOOR AC-
TUATOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from auto A/C
control module and mode door actuator.
3) Measure the resistance of harness
between auto A/C control module and
mode door actuator.
Connector & terminal
(i48) No. 2 — (B77) No. 5:
Is the measured value less than specified
value?
1
Ω
Replace the auto
A/C control mod-
ule.
Repair the har-
ness between auto
A/C control mod-
ule and mode door
actuator.
9
CHECK AUTO A/C CONTROL MODULE SIG-
NAL VOLTAGE.
1) Turn ignition switch to ON.
2) Press the mode control dial and measure
voltage between auto A/C control module
harness connector and chassis ground for
each mode.
Connector & terminal
(i48) No. 10 (+) — Chassis ground (
−−−−
):
Is the measured value within specified
value?
VENT, D/H: 5 V, BI-LEVEL,
HEAT, DEF: 0 V
Step
Value
Yes
No