Subaru B9 TRIBECA WX 2007, Manual

Page: 148 / 861

AB(diag)-73
Diagnostic Chart with Trouble Code
AIRBAG SYSTEM (DIAGNOSTICS)
K: DTC 27 ODS COMMUNICATION ERROR
DTC DETECTING CONDITION:
• Occupant detection control module communication is faulty.
• Airbag rear harness circuit is open, shorted, shorted to ground or shorted to power supply.
• Occupant detection harness (seat harness) is faulty.
• Occupant detection system is faulty.
• Airbag control module is faulty.
Step Check Yes No
1 CHECK POOR CONTACT OF CONNEC-
TORS.
Check for poor contact of the connectors
between the airbag control module and the
occupant detection control module.
Is there poor contact? Reconnect the
connector. If defec-
tive is not
improved, replace
the airbag rear har-
ness RH or the
occupant detection
harness (seat har-
ness). Go to step
2
.
2 CHECK THE AIRBAG HARNESS.
1) Turn the ignition switch to OFF, disconnect
the battery ground cable, and wait more than 20
seconds.
2) Disconnect the connector (AB18) from air-
bag control module.
3) Disconnect the connectors (AB59) and
(AB61) under the passenger’s seat.
4) Connect the connector (1U) in the test har-
ness U to connector (AB18).
5) Connect the connector (1AB) in the test har-
ness AB to the connector (AB61).
6) Measure the resistance between connector
(3U) in the test harness U and connector (2AB)
in the test harness AB.
Connector & terminal
(3U) No. 2 — (2AB) No. 1:
(3U) No. 4 — (2AB) No. 2:
Is the resistance less than 10
Ω
?
Go to step 3 . Replace the airbag
rear harness RH
along with body
harness.
3 CHECK THE AIRBAG HARNESS.
Measure the resistance between connector
(3U) in the test harness U and chassis ground.
Connector & terminal
(3U) No. 2 — Chassis ground:
(3U) No. 2 — (3U) No. 4:
Is the resistance less than 10
Ω
?
Go to step 4 . Replace the airbag
rear harness RH
along with the body
harness.
4 CHECK THE AIRBAG HARNESS.
1) Turn the ignition switch to ON.
2) Measure the voltage between connector
(2AB) in the test harness AB and chassis
ground.
Connector & terminal
(2AB) No. 3 (+) — Chassis ground (–):
Is the voltage 9 V or more? Go to step
5
. Check the battery
voltage and fuse. If
there is no faulty,
replace the airbag
rear harness RH
along with body
harness.
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