Subaru Legacy 2003 Service Manual page 3523

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC) (LHD
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
10.Diagnostic Procedure with Diagnostic Trouble Code (DTC) (LHD
Model)
A: DTC 21 OR -21 (AMBIENT SENSOR)
TROUBLE SYMPTOM:
Fan speed, outlets and inlets are not switched when AUTO or ECON switch is ON.
WIRING DIAGRAM:
F78
F2
1 2
1 2 3 4 5 6 7
12 13 14 15 16 17 18 19 20
A:
i48
B:
i49
8 9 10 11 1 2 3 4 5 6 7 8 9 10
21 22 23 24 11 12 13 14 15 16 17 18 19 20
MODEL)
F78
F2
B100
B36
i1
AUTO A/C
B:
i49
CONTROL MODULE
B36
A1 A2 A4 A5 A6
A3
B1 B2 B4 B5 B6
B3
C2 C4 C5 C6
D1 D2 D4 D5 D6
C3
E1 E2 E4 E5 E6
F1 F6
G1 G6
H6
H1
I1 I6
J1 J6
K1 K6
L1 L2 L4 L5 L6
N3
M1 M2 M4 M5 M6
N2 N4 N5 N6
O3
O1 O2 O4 O5 O6
P3
P1 P2 P4 P5 P6
AC-50
AC-00371