Subaru Legacy 2003 Service Manual page 3484

Content
BATT voltage (Memory back-up)
IGN power supply
ACC power supply
(OFF: ignition in START or diag-
nosis system reset)
A/C control module ground circuit
Sensor ground circuit
Ambient sensor
Evaporator sensor
Thermometer
Sunload sensor
Air mix door actuator
Air mix door actuator P.B.R.
Mode actuator VENT
Mode actuator DEF
Intake door actuator FRS voltage
Intake door actuator CIRC voltage
Blower fan relay
A/C relay
Illumination control signal
Rear defogger
A/C CONTROL MODULE I/O SIGNAL
Connector &
Terminal No.
BATT voltage,
b1—b12
13 — 14 (engine running)
Battery voltage (ignition switch ON),
a8—b12
13 — 14 (engine running)
b2—b12 BATT voltage, 0 (engine cranking), BATT voltage (during engine starts)
b12—body 0 (ignition switch ON) — circuit constantly grounded
b17—body 0 (ignition switch ON) — circuit constantly grounded
b6—b17
b7—b17 Approx. 3.3 (disconnect connector, and ignition switch ON)
b15—b12
b16—b17 Approx. 4.2 (disconnect connector, and ignition switch ON)
BATT voltage (AUTO mode) positive "+" at terminal "a4" and negative "–" at
a4—a3 "a3" [temperature set at 18°C (65°F)]; negative "–" at terminal "a4" and posi-
tive "+" at "a3" [temperature set at 32°C (90°F)]
Approx. 0.5 [temperature set at 18°C (65°F) in AUTO mode]
a12—b17
Approx. 4.5 [temperature set at 32°C (90°F) in AUTO mode]
BATT voltage (ignition switch ON in MANUAL mode); positive "+" at terminal
a5—b17 "a5" and negative "–" at "b17" (VENT); negative "–" at "a5" and positive "+" at
"b17" (DEF)
BATT voltage (ignition switch ON in MANUAL mode)
a6—b17
Approx. 4.5 (VENT); approx. 0.5 (DEF)
a7—a15 BATT voltage (CIRC switch OFF)
a15—a7 BATT voltage (CIRC switch ON)
b14—body BATT voltage (ignition switch ON)
0 (ignition and A/C switches ON)
b3—b12
BATT voltage (A/C switch OFF)
b10—b20 BATT voltage (ignition and lighting switches ON)
a13—b12 0 (IGN ON, R Def SW ON)
AC-11
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Signal (V)