Subaru Impreza 2002 Service Manual page 3213

HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
4. A/C Control Module I/O Signal
A: ELECTRICAL SPECIFICATION
10
20 19 18 17 16 15 14 13 12 11
Content
Battery power supply (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 door actuator
Mode door actuator P.B.R.
Intake door FRS voltage
Intake door CIRC voltage
Blower fan relay
A/C relay
Illumination control signal
Rear defogger
A/C CONTROL MODULE I/O SIGNAL
9 8 7 6 5 4 3 2 1
To B283 : b
Connector &
Terminal No.
Battery voltage,
b1—b12
13 — 14 (engine running)
Battery voltage (ignition switch ON),
a8—b12
13 — 14 (engine running)
b2—b12 Battery voltage, 0 (engine cranking), Battery voltage (during engine starts)
b12—body 0 (ignition switch ON) — circuit constantly grounded
b17—body 0 (ignition switch ON) — continuity exists
b9—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)
b5—b1 Battery voltage (ignition switch ON)
a4—b17 Approx. 5.5
b6—b17 Battery voltage (ignition switch ON)
a12—b17 Approx. 5.5
a15—a7 Battery voltage (CIRC switch OFF)
a7—a15 Battery voltage (CIRC switch ON)
b14—body Battery voltage (ignition switch ON)
0 (ignition and A/C switches ON)
b3—b12
Battery voltage (A/C switch OFF)
b10—b20 Battery voltage (ignition and lighting switches ON)
a13—b12 0 (IGN ON, R Def SW ON)
8 7 6
16 15 14 13 12 11
To B282 : a
Signal (V)
AC-8
5 4 3 2 1
10 9
HV0032