Subaru Legacy 2003 Service Manual page 3486

Content
BATT voltage (Memory back-up)
IGN power supply
ACC power supply
(OFF: ignition in START or diag-
nosis system reset)
Sensor standard voltage
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 door actuator
Mode door actuator P.B.R.
Intake door FRS actuator voltage
Intake door CIRC actuator voltage
Blower fan relay
Blower fan relay
Rear defogger relay
A/C relay
Illumination control signal
B: SCHEMATIC
<Ref. to WI-62, SCHEMATIC, Air Conditioning System.>
A/C CONTROL MODULE I/O SIGNAL
Connector &
Terminal No.
BATT voltage,
a1—a9
13 — 14 (engine running)
Battery voltage (ignition switch ON),
a2—a9
13 — 14 (engine running)
a3—a9 BATT voltage, 0 (engine cranking), BATT voltage during engine starts
a5—a9 5 (ignition switch ON)
a9—body 0 (ignition switch ON) — circuit constantly grounded
a10—body 0 (ignition switch ON) — circuit constantly grounded
a11—a10
a12—a10 Approx. 3.3 (disconnect connector, and ignition switch ON)
a13—a9
a5—a4 Approx. 4.2 (disconnect connector, and ignition switch ON)
BATT voltage (AUTO mode) positive "+" at terminal "b1" and negative "–" at
b1—b11 "b11" [temperature set at 18°C (65°F)]; negative "–" at terminal "b1" and pos-
itive "+" at "b11" [temperature set at 32°C (90°F)]
Approx. 0.5 [temperature set at 18°C (65°F) in AUTO mode]
a6—a10
Approx. 4.5 [temperature set at 32°C (90°F) in AUTO mode]
BATT voltage (ignition switch ON in MANUAL mode); positive "+" at terminal
a8—a16 "a8" and negative "–" at "a8" (VENT); negative "–" at "a16" and positive "+" at
"a16" (DEF)
BATT voltage (ignition switch ON in MANUAL mode)
a14—a10
Approx. 4.5 (VENT); approx. 0.5 (DEF)
b2—a9 BATT voltage (DEF switch ON)
b12—a9 BATT voltage (CIRC switch ON)
b3—a9 BATT voltage (ignition switch ON, blower switch OFF)
0 (ignition ON, manual blower HI)
b5—a9
5 (ignition ON, manual blower LO)
b13—a9 0 (ignition switch ON, Rear DEF switch ON)
BATT voltage (ignition and A/C switches ON)
a7—a9
0 (A/C switch OFF)
b10—a9 BATT voltage (ignition and lighting switches ON)
AC-13
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Signal (V)