Subaru B9 TRIBECA WX 2007 Manual page 148

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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
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.
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:
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:
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 (–):
Diagnostic Chart with Trouble Code
Is there poor contact?
Is the resistance less than 10
Ω?
Is the resistance less than 10
Ω?
Is the voltage 9 V or more?
AB(diag)-73
AIRBAG SYSTEM (DIAGNOSTICS)
Check Yes
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 3.
Go to step 4.
Go to step 5.
No
Go to step 2.
Replace the airbag
rear harness RH
along with body
harness.
Replace the airbag
rear harness RH
along with the body
harness.
Check the battery
voltage and fuse. If
there is no faulty,
replace the airbag
rear harness RH
along with body
harness.