Subaru Impreza 2003, Service Manual

Page: 2769 / 3610

AC-7
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
A/C CONTROL MODULE I/O SIGNAL
4. A/C Control Module I/O Signal
A: ELECTRICAL SPECIFICATION
Content
Connector &
Terminal No.
Signal (V)
Battery power supply (Memory
back-up)
B1 — B12
Battery voltage,
13 — 14 (engine running)
IGN power supply A8 — B12
Battery voltage (ignition switch ON),
13 — 14 (engine running)
ACC power supply B2 — B12 Battery voltage, 0 (engine cranking), Battery voltage (engine running)
A/C control module ground circuit
B12 — chas-
sis ground
0 (ignition switch ON) — circuit constantly grounded to chassis
Sensor ground circuit
B17 — chas-
sis ground
0 (ignition switch ON) — circuit constantly grounded to chassis
Ambient sensor B9 — B17
Approx. 5 (disconnect connector, and ignition switch ON) Evaporator sensor B7 — B17
Thermometer B15 — B12
Sunload sensor B16 — B17 Approx. 5 (disconnect connector, and ignition switch ON)
Air mix door actuator B5 — B1 Battery voltage (ignition switch ON)
Air mix door actuator P.B.R. A4 — B17 LAN connection
Mode door actuator B6 — B17 Battery voltage (ignition switch ON)
Mode door actuator P.B.R. A12 — B17 LAN connection
Intake door FRS voltage A15 — A7 Battery voltage (FRESH/RECIRC switch OFF)
Intake door CIRC voltage A7 — A15 Battery voltage (FRESH/RECIRC switch ON)
Blower fan relay B14 — body Battery voltage (ignition switch ON)
A/C relay B3 — B12
0 (ignition and A/C switches ON)
Battery voltage (A/C switch OFF)
Illumination control signal B10 — B20 Battery voltage (ignition and lighting switches ON)
Rear window defogger A13 — B12 0 (ignition switch ON, rear window defogger switch ON)
AC-00735
10
20 19 18 17 16 15 14 13 12 11
9 8 7 6 5 4 3 2 1
10 16 15 14 13 12 11 9
8 7 6 5 4 3 2 1
To B: B283 To A: B282