Subaru IMPREZA GD 2007 Series Manual page 3961

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
IMMOBILIZER (DIAGNOSTICS)
G: DTC P1570 ANTENNA
DTC DETECTING CONDITION:
Faulty antenna
WIRING DIAGRAM:
B142
1
2 1
14
Step
1 CHECK ANTENNA CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the harness antenna connector
from IMMCM. <Ref. to SL-48, Immobilizer
Antenna.>
3) Measure the resistance of the antenna cir-
cuit.
Connector & terminal
(B142) No. 1 — No. 2:
2 CHECK ANTENNA CIRCUIT.
Measure the resistance between antenna har-
ness connector and chassis ground.
Connector & terminal
(B141) No. 1 — Chassis ground:
3 CHECK ANTENNA CIRCUIT.
Measure the resistance between antenna har-
ness connector and chassis ground.
Connector & terminal
(B141) No. 14 — Chassis ground:
4 CHECK ANTENNA CIRCUIT.
1) Turn the ignition switch to ON. (engine OFF)
2) Measure the voltage between antenna har-
ness connector and chassis ground.
Connector & terminal
(B141) No. 1 (+) — Chassis ground (–):
IMMOBILIZER ANTENNA
IMMOBILIZER
B141
CONTROL MODULE
B141
2 3 4 5 6 7 8 9 10 11 12 13
15 16 17 18 19 20 21 22 23 24 25 26
Is the resistance less than 10 Ω? Go to step 2.
Is the resistance less than 10 Ω? Replace the
Is the resistance less than 10 Ω? Replace the
Is the voltage less than 1 V?
IM(diag)-20
B142
Check Yes
antenna. <Ref. to
SL-48, Immobi-
lizer Antenna.>
antenna. <Ref. to
SL-48, Immobi-
lizer Antenna.>
Go to step 5.
IM-00132
No
Replace the
antenna. <Ref. to
SL-48, Immobi-
lizer Antenna.>
Go to step 3.
Go to step 4.
Replace the
antenna. <Ref. to
SL-48, Immobi-
lizer Antenna.>