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DTC B1647 Side Satellite Sensor Bus LH Lost Communication: 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. 
Read the DTC.		 Is DTC B1627 or B1628 displayed? Perform the diagnosis according to DTC. Go to step 2  .
2 CHECK DTC. 
Read the DTC.		 Is DTC B1637 or B1638 displayed? Perform the diagnosis according to DTC. Go to step 3  .
3 CHECK DTC. 
Read the DTC.		 Is DTC B1697 or B1698 displayed? Perform the diagnosis according to DTC. Go to step 4  .
4 CHECK POOR CONTACT OF CONNECTORS. 
Check for poor contact of the connectors between the airbag control module and the front door impact sensor (LH).		 Is there poor contact? Replace the airbag rear harness and the door harness. Go to step 5  .
5 CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND SIDE 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 connectors (AB6, AB17, AB18) from airbag control module.
  6. Connect the connector (1AH) in the test harness AH to the connectors (AB6, AB17, AB18).
  7. Connect the connector (2AH) in the test harness AH and the connector (1AG) in the test harness AG.
  8. Disconnect the connector (AB23) from the side airbag sensor (LH).
  9. Connect the connector (2V) in the test harness V to the connector (AB23).
  10. Measure the resistance between connector (5AG) in the test harness AG and connector (3V) in the test harness V.

    Connector & terminal 

    (5AG) No. 10 - (3V) No. 1: 

    (5AG) No. 9 - (3V) No. 2: 

 Is the resistance less than 10 Ω? Go to step 6  . Replace the airbag rear harness along with body harness.
6 CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND SIDE AIRBAG SENSOR LH). 
Measure the resistance between connector (3V) in test harness V and chassis ground, and the resistance between connector (3V) terminals.
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 7  . Replace the airbag rear harness along with body harness.
7 CHECK AIRBAG REAR HARNESS (BETWEEN SIDE AIRBAG SENSOR AND CURTAIN AIRBAG SENSOR LH). 
  1. Disconnect the connector (2V) in the test harness V from the connector (AB23) of side airbag sensor (LH).
  2. Connect the connector (AB23) of side airbag sensor (LH) and the connector (1AI) in the test harness AI.
  3. Connect the connector (2AI) in the test harness AI and the connector (1V) in the test harness V.
  4. Disconnect the connector (AB32) from curtain airbag sensor (LH), and connect the connector (2V) in test harness V to connector (AB32).
  5. 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 8  . Replace the airbag rear harness along with body harness.
8 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) terminals in test harness V.
Connector & terminal 
(3V) No. 2 - Chassis ground: 
(3V) No. 1 - Chassis ground: 
(3V) No. 1 - (3V) No. 2: 		 Is the resistance 1 MΩ or more? Go to step 9  . Replace the airbag rear harness along with body harness.
9 CHECK AIRBAG REAR HARNESS AND DOOR HARNESS (BETWEEN CURTAIN AIRBAG SENSOR LH AND DOOR SENSOR LH). 
  1. Disconnect the connector (AB58) from the front door impact sensor (LH), and connect the connector (1H) in the test harness H to connector (AB58).
  2. Measure the resistance between connector (3V) in the test harness V and connector (3H) in the test harness H.

    Connector & terminal 

    (3V) No. 4 - (3H) No. 5: 

    (3V) No. 5 - (3H) No. 6: 

 Is the resistance less than 10 Ω? Go to step 10  . Check the door harness, and if any fault is found, replace the harness. If there is no fault, replace the airbag rear harness together with body harness.
10 CHECK AIRBAG REAR HARNESS AND DOOR HARNESS (BETWEEN CURTAIN AIRBAG SENSOR LH AND DOOR SENSOR LH). 
Measure the resistance between connector (3V) in test harness V and chassis ground, and the resistance between connector (3V) terminals in test harness V.
Connector & terminal 
(3V) No. 4 - Chassis ground: 
(3V) No. 5 - Chassis ground: 
(3V) No. 4 - (3V) No. 5: 		 Is the resistance 1 MΩ or more? Go to step 11  . Check the door harness, and if any fault is found, replace the harness. If there is no fault, replace the airbag rear harness together with body harness.
11 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? Go to step 12  . Go to step 15  .
12 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.
 Is the same DTC displayed? Go to step 13  . Go to step 15  .
13 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.
 Is the same DTC displayed? Go to step 14  . Go to step 15  .
14 REPLACE FRONT DOOR IMPACT 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 front door impact sensor (LH). Refer to REMOVAL .
  3. Connect all connectors.
  4. Clear the memory.
  5. Perform the Inspection Mode.
  6. Read the DTC.
 Is the same DTC displayed? Replace the airbag control module. Refer to REMOVAL . Go to step 15  .
15 CHECK FOR ANY OTHER DTC ON DISPLAY.  Is any other DTC displayed? Perform the diagnosis according to DTC. Finish the diagnosis.
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