Subaru Impreza 2004 Service Manual page 33

Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
B: IN-VEHICLE SENSOR
TROUBLE SYMPTOM:
• When turning the AUTO switch to ON, blower fan speed, outlet port and inlet port is not changed.
• If the switch LED indicates that the sensor is malfunctioning, replace the A/C control module. The in-vehi-
cle sensor is built into the A/C control module and cannot be replaced as a single unit.
C: EVAPORATOR SENSOR
WIRING DIAGRAM:
B256
AUTO A/C
A: B:
B282 B283
CONTROL MODULE
B256 B: B283
1 2 3 4 5 6 7 8 9 10
1 2
11 12 13 14 15 16 17 18 19 20
AC-00679
AC(diag)-31