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DTC 39 Seat Belt Warning Failure: Wiring Diagram

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Seat Belt Warning Failure - Wiring Diagram
G07672896Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE CHART

Step Check Yes No
1 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. Connect the battery ground terminal and turn the ignition switch to ON.
 Does the passenger's seat belt warning light blink for 6 seconds and go off? Go to step 3  . Go to step 2  .
2 CHECK AIRBAG HARNESS. 
  1. Turn the ignition switch to OFF.
  2. Connect the connector (1AG) in the test harness AG to the connectors (AB6, AB17, AB18).
  3. Measure the resistance between connector (2AG) in the test harness AG and chassis ground.

    Connector & terminal 

    (2AG) No. 10 - Chassis ground: 

 Is the resistance 1 MΩ or more? Replace the body integrated unit. Repair the bulkhead harness. Or replace the airbag main harness along with body harness.
3 CHECK AIRBAG HARNESS. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors (AB6, AB17, AB18) from the airbag control module, and connect the connector (1 AG) in the test harness AG.
  3. Connect the connectors (7AG) and (8AG) in the test harness AG.
  4. Turn the ignition switch to ON.
 Does the passenger's seat belt warning light blink for 6 seconds, then repeatedly light and go off? Replace the airbag control module. < Ref. to AIRBAG CONTROL MODULE . > Go to step 4  .
4 CHECK AIRBAG HARNESS. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors (7AG) and (8AG) in the test harness AG.
  3. Disconnect the connector (B281) from body integrated unit.
  4. Measure the resistance between connector (2AG) in the test harness AG and connector (B281).

    Connector & terminal 

    (2AG) No. 10 - (B281) No. 26: 

 Is the resistance less than 10 Ω? Replace the body integrated unit. Repair the bulkhead harness. Or replace the airbag main harness along with body harness.
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