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DTC 27 ODS Communication Error: Wiring Diagram

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Occupant Detection System < Refer to appropriate SYSTEM WIRING DIAGRAM. >

Fig 1: ODS Communication Error Wiring Diagram
G08566119Courtesy of SUBARU OF AMERICA, INC.
Step Check Yes No
1 CHECK POOR CONTACT OF CONNECTORS. 
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 defective is not improved, replace the airbag rear harness along with the body harness or the occupant detection harness (seat harness). Go to step 2  .
2 CHECK AIRBAG HARNESS. 
  1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.
  2. Disconnect the connectors (AB6, AB17, AB18) from airbag control module.
  3. Disconnect the connectors (AB59) and (AB53) under the passenger's seat.
  4. Connect the connector (1AG) in the test harness AG to the connectors (AB6, AB17, AB18).
  5. Connect the connector (1AB) in the test harness AB to the connector (AB53).
  6. Measure the resistance between connector (6AG) in the test harness AG and connector(2AB) in the test harness AB.

    Connector & terminal 

    (6AG) No. 9 - (2AB) No. 1: 

    (6AG) No. 11 - (2AB) No. 2: 

 Is the resistance less than 10 Ω? Go to step 3  . Replace the airbag rear harness along with body harness.
3 CHECK AIRBAG HARNESS. 
Measure the resistance between connector (6AG) in the test harness AG and chassis ground.
Connector & terminal 
(6AG) No. 9 - Chassis ground: 
(6AG) No. 9 - (6AG) No. 11: 
(6AG) No. 11 - Chassis ground: 		 Is the resistance less than 1 MΩ? Go to step 4  . Replace the airbag rear harness along with body harness.
4 CHECK 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? Replace the occupant detection harness (seat harness). If defective is not improved, replace the occupant detection system (seat cushion & frame assembly), and then the airbag control module in this order. Check the battery voltage and fuse. If there is no fault, replace the airbag rear harness along with body harness or replace the body harness.
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