Subaru 2009 IMPREZA Service Manual page 3388

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
I: DTC U1202 CAN-HS BUS OFF
DTC DETECTING CONDITION:
Communication with body integrated unit is not possible because of the following reasons.
• Open or power supply-output short, GND-output short occurs in CAN line.
• End resistance malfunction
• Internal error in each control module
TROUBLE SYMPTOM:
Each warning light illuminates because the CAN communication (sending and receiving) is not normal.
WIRING DIAGRAM:
C:
B136 C27
ECM C35
ABS : WITHOUT VDC
VDC : WITH VDC
B231
1 2 3 4
B: B55
C: B136
1 2 3 4 5 6
7 8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35
DATA LINK CONNECTOR
B40
B: B280
BODY
INTEGRATED
UNIT
B230 B: B280
1 2 3
7 8 9 10 11 12 13 14 15 16 17
1
18 19 20 21 22 23 24
2
3
4
B40
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
LAN(diag)-55
B230 B231
YAW RATE &
STEERING
G SENSOR
ANGLE
SENSOR
B: B55
TCM
4 5 6
12 13 14 15
25 26
1 2 3 4 5 6 7 8 9
22 23 24 25
26 27 28 29 30
LAN SYSTEM (DIAGNOSTICS)
B310
VDC
CONTROL
MODULE
B301
ABS CM
B301
1 2 3 4 5 6 7 8 9 10 11
16 17 18 19 20 21 22 23 24 25 26
B310
10 11 12 13 14 15 16 17 18 19 20 21
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
LAN00422