DTC B1820 Short In Side Airbag RH: Wiring Diagram

See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Airbag System - Wiring Diagram (Side Airbag RH)

Courtesy 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, side airbag module RH and the side airbag sensor RH.	Is there poor contact?	Replace the airbag rear harness along with body harness.	Go to step 2  .
2 CHECK SIDE AIRBAG MODULE.  Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more. Disconnect the connector (AB24) from the side airbag module (RH), and connect the connector (1AJ) in the test harness AJ to connector (AB24). Connect the airbag resistor to the test harness AJ connector (3AJ). Connect the battery ground terminal and turn the ignition switch to ON.	Does the airbag warning light illuminate for 6 seconds and go off?	Replace the side airbag module (RH). Refer to REMOVAL , Side Airbag Module.	Go to step 3  .
3 CHECK AIRBAG REAR HARNESS (SIDE AIRBAG MODULE HARNESS RH).  Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more. Disconnect the connector (AB26) from seat belt pretensioner (RH). Disconnect the connector (AB33) from curtain airbag module (RH). Disconnect the airbag resistor from test harness AJ. Disconnect the connectors (AB6, AB17, AB18) from airbag control module. Connect the connector (1AG) in the test harness AG to the connectors (AB6, AB17, AB18). NOTE: For sedan models, connect test harness AH between the connectors (AB6, AB17, AB18) and (1AG). Measure the resistance between connector (3AJ) terminals in test harness AJ. Connector & terminal  (3AJ) No. 1 - (3AJ) No. 2:	Is the resistance 1 MΩ or more?	Go to step 4  .	Replace the airbag rear harness along with body harness.
4 CHECK AIRBAG CONTROL MODULE.  Connect all connectors. Clear the memory. Perform the Inspection Mode. Read the DTC. (Current malfunction)	Is the same DTC displayed?	Replace the airbag control module. Refer to AIRBAG CONTROL MODULE .	Go to step 5  .
5 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.