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DTC B1638 Curtain Airbag Sensor LH Initialization Error: Wiring Diagram

See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Airbag System - Wiring Diagram
G07914593Courtesy of SUBARU OF AMERICA, INC.
Step Check Yes No
1 CHECK DTC.  Is DTC B1627 or B1628 displayed? Perform the diagnosis according to DTC. Go to step 2  .
2 CHECK POOR CONTACT OF CONNECTORS. 
Check for poor contact of the connectors between the airbag control module and the door sensor (LH).		 Is there poor contact? Replace the airbag rear harness and the door harness. Go to step 3  .
3 CHECK AIRBAG REAR HARNESS (BETWEEN SIDE AIRBAG SENSOR LH AND CURTAIN AIRBAG SENSOR LH). 
  1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.
  2. Disconnect the connector (AB21) from seat belt pretensioner (LH).
  3. Disconnect the connector (AB31) from curtain airbag module (LH).
  4. Disconnect connector (AB19) of the side airbag module (LH).
  5. Disconnect the connector (AB23) in the side airbag sensor (LH).
  6. Connect the connector (AB23) of side airbag sensor (LH) and the connector (1AI) in the test harness AI.
  7. Connect the connector (2AI) in the test harness AI and the connector (1V) in the test harness V.
  8. Disconnect the connector (AB32) from curtain airbag sensor (LH), and connect to the connector (2V) in test harness V.
  9. Measure the resistance between connector (3V) terminals in the test harness V.

    Connector & terminal 

    (3V) No. 2 - (3V) No. 6: 

    (3V) No. 1 - (3V) No. 7: 

 Is the resistance less than 10 Ω? Go to step 4  . Replace the airbag rear harness along with body harness.
4 CHECK AIRBAG REAR HARNESS (BETWEEN SIDE AIRBAG SENSOR AND CURTAIN AIRBAG SENSOR LH). 
Measure the resistance between connector (3V) in test harness V and chassis ground, and the resistance between connector (3V) in test harness V.
Connector & terminal 
(3V) No. 1 - Chassis ground: 
(3V) No. 2 - Chassis ground: 
(3V) No. 1 - (3V) No. 2: 		 Is the resistance 1 MΩ or more? Go to step 5  . Replace the airbag rear 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? Go to step 6  . Go to step 8  .
6 REPLACE CURTAIN AIRBAG SENSOR (LH) AND CHECK AIRBAG CONTROL MODULE AFTER REPLACEMENT. 
  1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.
  2. Replace the curtain airbag sensor (LH). Refer to REMOVAL .
  3. Connect all connectors.
  4. Clear the memory.
  5. Perform the Inspection Mode.
  6. Read the DTC. (Current malfunction)
 Is the same DTC displayed? Go to step 7  . Go to step 8  .
7 REPLACE SIDE AIRBAG SENSOR (LH) AND CHECK AIRBAG CONTROL MODULE AFTER REPLACEMENT. 
  1. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.
  2. Replace the side airbag sensor (LH). Refer to REMOVAL .
  3. Connect all connectors.
  4. Clear the memory.
  5. Perform the Inspection Mode.
  6. Read the DTC. (Current malfunction)
 Is the same DTC displayed? Replace the airbag control module. Refer to REMOVAL . Go to step 8  .
8 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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