Subaru B9 TRIBECA WX 2007 Manual page 553

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
IMMOBILIZER (DIAGNOSTICS)
D: DTC P1572 IMM CIRCUIT FAILURE (EXCEPT ANTENNA CIRCUIT)
DTC DETECTING CONDITION:
Communication failure between body integrated unit and ECM
WIRING DIAGRAM:
BATTERY
A: i84
1 2 3 4 5 6
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
Step
1 CHECK BODY INTEGRATED UNIT POWER
SUPPLY CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
body integrated unit.
3) Measure the voltage between body inte-
grated unit harness connector terminal and
chassis ground.
Connector & terminal
(B280) No. 7 (+) — Chassis ground (–):
(B281) No. 2 (+) — Chassis ground (–):
2 CHECK BODY INTEGRATED UNIT POWER
SUPPLY CIRCUIT.
1) Turn the ignition switch to ON. (Engine OFF)
2) Measure the voltage between body inte-
grated unit harness connector terminal and
chassis ground.
Connector & terminal
(i84) No. 1 (+) — Chassis ground (–):
MAIN SBF SBF-3
SBF-8
C:
B136 ECM
B: B280
1 2 3 4 5 6 7
7 8
8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
34 35
Is the voltage 10 V or more?
Is the voltage 10 V or more?
IM(diag)-20
IGNITION
SWITCH
F/B No.12
F/B No.7
M/B No.8
A: i84
B: B280 BODY INTEGRATED UNIT
C: B281
E
C: B281
1 2 3 4 5 6 7
8 9
10 11 12 13 14 15 16 17 18 19
7
20 21 22 23 24 25 26 27 28
17 18 19 20
28 29
Check Yes
Go to step 2.
Go to step 3.
C: B136
1 2 3 4 5 6
8 9 10 11 12 13 14 15 16
21 22 23 24 25 26 27
30 31 32 33 34 35
IM-00142
No
Check the harness
for open or short
circuit between
body integrated
unit and fuse.
Check the harness
for open or short
circuit between
body integrated
unit and ignition
switch.