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DTC B1800 Short In Driver's Airbag: Wiring Diagram

See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Airbag System - Wiring Diagram (Driver's Airbag)
G08584198Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE

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 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 AND 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. Remove the console front panel and disconnect the connector (AB9).
  3. Disconnect the airbag resistor from the connector (2N) in test harness N and from the connector (2Q) in test harness Q.
  4. Disconnect the connectors (AB6, AB17, AB18) from the airbag control module, and connect the connector (1AG) in the test harness AG.
    NOTE: For sedan models, connect test harness AH between the connectors (AB6, AB17, AB18) and (1AG).
  5. Measure the resistance between connector (2Q) terminals in test harness Q.

    Connector & terminal 

    (2Q) No. 1 - (2Q) No. 2: 

 Is the resistance 1 MΩ or more? Go to step 5  . Go to step 4  .
4 CHECK AIRBAG MAIN HARNESS (DRIVER'S AIRBAG HARNESS). 
  1. Remove the instrument panel lower cover and column cover, and disconnect the connector (AB7) from (AB2).
  2. Measure the resistance between connector (3AG) terminals in test harness AG.

    Connector & terminal 

    (3AG) No. 1 - (3AG) No. 3: 

 Is the resistance 1 MΩ or more? Replace the roll connector. Refer to ROLL CONNECTOR . 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. (Current malfunction)
 Is the same DTC displayed? Replace the airbag control module. Refer to AIRBAG CONTROL MODULE . Go to step 6  .
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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