Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b1622 side airbag sensor rh lost communication

Subaru Legacy BN/BS (2015-2019) Service Manual / Airbag system (diagnostics) / Diagnostic chart with trouble code / Dtc b1622 side airbag sensor rh lost communication

DIAGNOSIS START CONDITION:

Ignition voltage is 10 V to 16 V.

DTC DETECTING CONDITION:

Side airbag sensor RH communication error (open/short circuit or connector connection failure between airbag CM and sensor, sensor internal communication circuit failure, CM internal communication circuit failure)

CAUTION:

Before performing diagnosis, refer to “CAUTION” in “General Description”. General Description > CAUTION

WIRING DIAGRAM:

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

Airbag system Airbag System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK POOR CONTACT OF CONNECTORS. Check for poor contact of the connectors between the airbag control module and the side airbag sensor RH.	Is there poor contact-	Replace the airbag main harness along with body harness.	Diagnostic Chart with Trouble Code > DTC B1622 SIDE AIRBAG SENSOR RH LOST COMMUNICATION
2.CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND SIDE AIRBAG SENSOR RH) (OPEN CIRCUIT). 1) Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more. 2) Disconnect the connector (AB26) from seat belt pretensioner RH. 3) Disconnect the connector (AB22) from seat cushion airbag module RH. 4) Disconnect the connector (AB33) from curtain airbag module RH. 5) Disconnect the connector (AB24) of side airbag module RH. 6) Disconnect the connectors (AB6, AB17, AB18) from airbag control module. 7) Connect the connector (1AD) in test harness AD AV to the connectors (AB6, AB17, AB18). 8) Connect the connector (2AD) in test harness AD AV and the connector (1AG) in test harness AG. 9) Disconnect the connector (AB28) from side airbag sensor RH, and connect the connector (2V) in test harness V to connector (AB28). 10) Measure the resistance between connector (5AG) in the test harness AG and connector (3V) in the test harness V. Connector & terminal (5AG) No. 8 — (3V) No. 1: (5AG) No. 10 — (3V) No. 2:	Is the resistance less than 10 --	Diagnostic Chart with Trouble Code > DTC B1622 SIDE AIRBAG SENSOR RH LOST COMMUNICATION	Replace the airbag rear harness along with body harness.
3.CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND SIDE AIRBAG SENSOR RH) (SHORTED TO GROUND AND SHORTED BETWEEN LINES). Measure the resistance between connector (5AG) in the test harness AG and chassis ground, and the resistance between connector (5AG) terminals in the test harness AG. Connector & terminal (3V) No. 1 — Chassis ground: (3V) No. 2 — Chassis ground: (3V) No. 1 — (3V) No. 2:	Is the resistance 1 M- or more-	Diagnostic Chart with Trouble Code > DTC B1622 SIDE AIRBAG SENSOR RH LOST COMMUNICATION	Replace the airbag rear harness along with body harness.
4.CHECK AIRBAG CONTROL MODULE. 1) Connect all connectors. 2) Clear the memory. Clear Memory Mode 3) Perform the Inspection Mode. Inspection Mode 4) Read the DTC. (Current malfunction) Read Diagnostic Trouble Code (DTC)	Is DTC B1622 displayed-	Diagnostic Chart with Trouble Code > DTC B1622 SIDE AIRBAG SENSOR RH LOST COMMUNICATION	Diagnostic Chart with Trouble Code > DTC B1622 SIDE AIRBAG SENSOR RH LOST COMMUNICATION
5.CHECK SIDE AIRBAG SENSOR RH. 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 RH by the side airbag sensor LH. Side Airbag Sensor > REMOVAL 3) Connect all connectors. 4) Clear the memory. Clear Memory Mode 5) Perform the Inspection Mode. Inspection Mode 6) Read the DTC. (Current malfunction) Read Diagnostic Trouble Code (DTC)	Is DTC B1622 displayed-	Diagnostic Chart with Trouble Code > DTC B1622 SIDE AIRBAG SENSOR RH LOST COMMUNICATION	Replace the curtain airbag sensor RH. Curtain Airbag Sensor > REMOVAL
6.CHECK CURTAIN AIRBAG SENSOR RH. 1) Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more. 2) Restore the side airbag sensors RH and LH back to their original position. Side Airbag Sensor > REMOVAL 3) Replace the curtain airbag sensor RH by the curtain airbag sensor LH. Curtain Airbag Sensor > REMOVAL 4) Connect all connectors. 5) Clear the memory. Clear Memory Mode 6) Perform the Inspection Mode. Inspection Mode 7) Read the DTC. (Current malfunction) Read Diagnostic Trouble Code (DTC)	Is DTC B1622 displayed-	Diagnostic Chart with Trouble Code > DTC B1622 SIDE AIRBAG SENSOR RH LOST COMMUNICATION	Replace the curtain airbag sensor RH. Curtain Airbag Sensor > REMOVAL
7.CHECK AIRBAG CONTROL MODULE. 1) Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more. 2) Restore the curtain airbag sensors RH and LH back to their original position. Curtain Airbag Sensor > REMOVAL 3) Connect all connectors. 4) Clear the memory. Clear Memory Mode 5) Perform the Inspection Mode. Inspection Mode 6) Read the DTC. (Current malfunction) Read Diagnostic Trouble Code (DTC)	Is DTC B1622 displayed-	Replace the airbag control module. Airbag Control Module > REMOVAL	Diagnostic Chart with Trouble Code > DTC B1622 SIDE AIRBAG SENSOR RH LOST COMMUNICATION
8.CHECK FOR ANY OTHER DTC ON DISPLAY. Read the DTC. (Current malfunction) Read Diagnostic Trouble Code (DTC)	Is any other DTC displayed-	Check DTC using “List of Diagnostic Trouble Code (DTC)”. List of Diagnostic Trouble Code (DTC)	Finish the diagnosis.

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