Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 781
LAN(diag)-33
List of Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
U1302
CAN-LS bus off
Integrated unit communi-
cation is shut down
because of low speed
CAN communication error.
U1311
CAN-LS meter unit data abnormal
Received error data from
meter.
U1321
CAN-LS meter no-receive data
Not received data from
meter.
B1401
M Collation NG
Malfunction related immo-
bilizer
B1402
Immobilizer Key Collation NG
Malfunction related immo-
bilizer
B1403
E/G request NG
Malfunction related immo-
bilizer
B1500
Keyless UART com. Malfunction
Open or short circuit in
keyless UART circuit
DTC
Item
Content of diagnosis
Note
LAN(diag)-34
List of Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
1. DTC TABLE
NOTE:
When more than two DTC codes are recorded, referring to their combination will make it easy to identify the
possible cause. Refer to the list for typical examples.
DTC to Check
Diagnostic Code that was displayed.
Probable cause
Body
integrated unit
ECM
VDC/
ABS CM
DCCD CM
B1100
—
—
—
There could be a problem in the
body integrated unit.
U1221
—
C0047
—
It is possible that the ECM is faulty.
U1223
U0122
—
—
It is possible that the VDC/ABS CM
is faulty.
U1226
—
—
—
It is possible that the DCCD CM is
faulty.
U1321
—
—
—
It is possible that the combination
meter is faulty.
B1500
—
—
—
It's possible that there is an internal
problem in the keyless entry control
module, or a open circuit in the
communication line.
LAN(diag)-35
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
12.Diagnostic Procedure with Diagnostic Trouble Code (DTC)
A: DTC B1100 INTEG. UNIT SYSTEM ERROR
DTC DETECTING CONDITION:
Memory read out error in body integrated unit
TROUBLE SYMPTOM:
LAN communication immobilizer function may not be executed normally.
Step
Check
Yes
No
1
Is B1100 a current malfunc-
tion?
Temporary
EEPROM access
error occurred.
2
CHECK CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the body integrated unit connec-
tor.
3) Connect the disconnected connectors.
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.
Is B1100 a current malfunc-
tion?
Replace the body
integrated unit.
<Ref. to SL-48,
REMOVAL, Body
Integrated Unit.>
Temporary
EEPROM access
error occurred.
LAN(diag)-36
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
LAN SYSTEM (DIAGNOSTICS)
B: DTC B1101 BATT P/SUPPLY MALFUNCTION CONT
DTC DETECTING CONDITION:
• Open or short in battery power supply control circuit
• Voltage malfunction caused by poor contact
TROUBLE SYMPTOM:
Each function (such as door lock control) stops operation.
NOTE:
• When B1102 BATT P/SUPPLY MALFUNCTION BACKUP is output at the same time, all the function of
body integrated unit may not operate.
• B1101 may input when the battery run-out occurs.
WIRING DIAGRAM:
CAN communication system <Ref. to WI-171, WIRING DIAGRAM, CAN Communication System.>
i97
2 3 4 5
1
6 7 8
13
14
15 16
17
27
24
25
26
20
21
22
23
29
30
31
28
32 35
33
34
37
38
39
36
40
8
9
10
11 12
1
2
5
3
4
7
6
19
18
B225
*
1
*
1
*
1
B225
3
4
10A
C20
B17
D27
B279
D:
B281
C:
B280
B:
i84
A:
C2
B6
i97
A2
8
B279
D:
5
7
6
4
8
2
1
9
3
10
23
2
2
11 12 13 14 15
27
6
2
5
2
4
2
16 17 18
29
8
2
19 20
21
30
B280
B:
6
4 5
3
1 2
9
7 8
17
6
1
5
1
4
1
3
1
2
1
1
1
0
1
20
9
1
8
1
24
3
2
2
2
1
2
26
5
2
7
5 6
8
2
1
9
4
3
0
1
4
2
2
2
5
2
3
2
1
1
2
1
3
1
4
1
5
1
8
2
7
2
6
2
6
1
7
1
8
1
9
1
1
2
0
2
B281
C:
1 2
3 4
5 6
7 8
9 0
1
1
1
2
1
4
1
5
1
6
1
7
1
8
1
9
1
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
2
0
3
1
3
2
3
3
3
4
3
5
3
3
1
A:
LAN00604
i84
JOINT GROUND
CONNECTOR
BODY INTEGRATED UNIT
FB-18
F/B FUSE NO. 7
(B)
MB-29
M/B FUSE NO. 8
(B)
TO POWER SUPPLY CIRCUIT
FUSE
(RELAY BLOCK)
: TERMINAL No. OPTIONAL
ARRANGEMENT
RELAY BLOCK
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