Subaru 2009 IMPREZA Service Manual page 2544

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AP:DTC C0071 STEER ANGLE SENSOR OP
DTC DETECTING CONDITION:
Signal does not come from steering angle sensor.
TROUBLE SYMPTOM:
VDC does not operate.
WIRING DIAGRAM:
B231
1 2 3 4
Step
1 CHECK POWER SUPPLY FOR STEERING
ANGLE SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from steering
angle sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between the steering
angle sensor and chassis ground.
Connector & terminal
(B231) No. 4 (+) — Chassis ground (–):
B310 VDCCM & H/U
TWISTED PAIR LINE
B231
STEERING
YAW RATE &
ANGLE
G SENSOR
SENSOR
B230
B230
1
2
3
4
Is the voltage 10 — 15 V?
VDC(diag)-82
MAIN SBF
IGNITION SWITCH
E
B310
1 2 3 4 5 6 7 8 9
22 23 24 25
26 27 28 29 30 31 32 33 34 35 36
Check
Go to step 2.
BATTERY
E
10 11 12 13 14 15 16 17 18 19 20 21
37 38 39 40 41 42 43 44 45 46
VDC00690
Yes No
Repair the steering
angle sensor
power supply cir-
cuit.