Subaru 2009 IMPREZA Service Manual page 3385

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
Step
1 CHECK DTC.
Read all DTCs using the Subaru Select Monitor.
<Ref. to LAN(diag)-15, READ DIAGNOSTIC
TROUBLE CODE (DTC), OPERATION, Subaru
Select Monitor.>
2 CHECK DTC.
Check DTC indicated by body integrated unit.
3 CHECK DTC.
1) Turn the ignition switch to OFF.
2) Disconnect all connectors (B280, B310 or
B301, B55, B136, B230, B231) that are con-
nected to high speed CAN communication line.
3) Connect all the disconnected connectors.
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
4 CHECK TCM.
1) Turn the ignition switch to OFF.
2) Disconnect the TCM connector (B55).
3) Turn the ignition switch to ON.
4) Read the DTC of body integrated unit using
Subaru Select Monitor.
5 CHECK STEERING ANGLE SENSOR.
NOTE:
For model without VDC, Go to step 7.
1) Turn the ignition switch to OFF.
2) Connect the TCM connector.
3) Disconnect the steering angle sensor con-
nector (B231).
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
6 CHECK YAW RATE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect the steering angle sensor connec-
tor.
3) Disconnect the yaw rate sensor connector
(B230).
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
7 CHECK VDC/ABS CM HARNESS.
1) Turn the ignition switch to OFF.
2) Connect the yaw rate sensor connector.
3) Disconnect the VDC/ABS CM (B301or
B310) connector.
4) Install the 120
CM connector terminals.
Terminals
Models with VDC
(B310) No. 10 — No. 35:
Models without VDC
(B301) No. 11 — No. 26:
5) Using the tester, measure the resistance
between terminals of data link connector.
Terminals
(B40) No. 6 — No. 14:
Are there any DTC other than
U1201 or DTC not related to
body integrated unit?
Is U1201 a current malfunc-
tion?
Is U1201 a current malfunc-
tion?
Is U1201 a current malfunc-
tion?
Is U1201 a current malfunc-
tion?
Is U1201 a current malfunc-
tion?
Is the resistance 60 ?
resistance to VDC/ABS
LAN(diag)-52
Check Yes
Perform the diag-
nosis according to
DTC.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 8.
No
Go to step 2.
Go to step 14.
Go to step 14.
Go to step 16.
Go to step 17.
Go to step 18.
Go to step 10.