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DTC 71 Driver's Airbag Failure: 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.

Airbag system < Refer to appropriate SYSTEM WIRING DIAGRAM.. >

Fig 1: Airbag System -- Wiring Diagram (DTC 71 Driver's Airbag Failure)
G08542903Courtesy 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 driver's airbag module.		 Is there poor contact? Replace the airbag main harness along with body harness. Go to step 2  .
2 CHECK DRIVER'S AIRBAG MODULE. 
  1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.
  2. Remove the driver's airbag module.
  3. Connect the connector (1N) in the test harness N to the connector (AB38).
  4. Connect the airbag resistor to the connector (2N) of test harness N.
  5. Connect the connector (1Q) in the test harness Q to connector (AB37).
  6. Connect the airbag resistor to the connector (2Q) in the test harness Q.
  7. Connect the battery ground terminal and turn the ignition switch to ON.
 Does the airbag warning light illuminate for six seconds and go off? Replace the driver's airbag module. < Refer to DRIVER'S AIRBAG MODULE . > Go to step 3  .
3 CHECK ROLL CONNECTOR. 
  1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.
  2. Disconnect the test harness N from connector (AB38).
  3. Disconnect the test harness Q from connector (AB37).
  4. Remove the instrument panel lower cover and disconnect the connector (AB7) from (AB2).
  5. Connect the connector (1P) in the test harness P to connector (AB2).
  6. Connect the airbag resistor to the connectors (2P) and (3P) of test harness P.
  7. Connect the battery ground terminal and turn the ignition switch to ON.
 Does the airbag warning light illuminate for six seconds and go off? Replace the roll connector. < Refer to ROLL CONNECTOR . > Go to step 4  .
4 CHECK AIRBAG MAIN HARNESS (DRIVER'S AIRBAG HARNESS). 
  1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.
  2. Disconnect the airbag resistor from the connectors (2P) and (3P) of test harness P.
  3. Remove the console front panel and disconnect the connector (AB9).
  4. Disconnect the connectors (AB6, AB17, AB18) from the airbag control module, and connect the connector (1AG) in the test harness AG.
  5. Measure the resistance between connector (3AG) in the test harness AG and chassis ground.

    Connector & terminal 

    (3AG) No. 2 - Chassis ground: 

    (3AG) No. 4 - Chassis ground: 

 Is the resistance 1 MΩ or more? Go to step 5  . Replace the airbag main harness along with body harness.
5 CHECK AIRBAG CONTROL MODULE. 
  1. Connect all connectors.
  2. Clear the memory.
  3. Perform the Inspection Mode.
  4. Read the DTC.
 Is the same DTC displayed? Replace the airbag control module. < Refer to AIRBAG CONTROL MODULE . > Go to step 6  .
AB(diag)-110 6 CHECK FOR ANY OTHER DTC ON DISPLAY.  Is any other DTC displayed? Check DTC using "List of Diagnostic Trouble Code (DTC)". < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > Finish the diagnosis.
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