Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b1617 front sub sensor lh lost communication

Subaru Legacy BN/BS (2015-2019) Service Manual / Airbag system (diagnostics) / Diagnostic chart with trouble code / Dtc b1617 front sub sensor lh lost communication

DIAGNOSIS START CONDITION:

Ignition voltage is 10 V to 16 V.

DTC DETECTING CONDITION:

Front sub sensor LH 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 (AB6, AB13) between the airbag control module and the front sub sensor LH.	Is there poor contact-	Replace the airbag main harness along with body harness.	Diagnostic Chart with Trouble Code > DTC B1617 FRONT SUB SENSOR LH LOST COMMUNICATION
2.CHECK AIRBAG MAIN HARNESS (FRONT SENSOR BUS LH) (OPEN CIRCUIT). 1) Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more. 2) Remove the instrument panel lower cover and column cover, and disconnect the connectors (AB7) and (AB2). 3) Remove the console front panel and disconnect the connector (AB9). 4) Disconnect the connectors (AB6, AB17, AB18) from airbag control module. 5) Connect the connector (1AD) in test harness AD AV to the connectors (AB6, AB17, AB18). 6) Connect the connector (2AD) in test harness AD AV and the connector (1AG) in test harness AG. 7) Disconnect the connector (AB13) from the front sub sensor LH, and then connect the connector (1H) in the test harness H to connector (AB13). 8) Measure the resistance between connector (4AG) in the test harness AG and connector (3H) in the test harness H. Connector & terminal (4AG) No. 7 — (3H) No. 5: (4AG) No. 9 — (3H) No. 6:	Is the resistance less than 10 --	Diagnostic Chart with Trouble Code > DTC B1617 FRONT SUB SENSOR LH LOST COMMUNICATION	Replace the airbag main harness along with body harness.
3.CHECK AIRBAG MAIN HARNESS (FRONT SENSOR BUS LH) (SHORTED TO GROUND AND SHORTED BETWEEN LINES). Measure the resistance between connector (4AG) in the test harness AG and chassis ground, and the resistance between connector (4AG) terminals in the test harness AG. Connector & terminal (4AG) No. 7 — Chassis ground: (4AG) No. 9 — Chassis ground: (4AG) No. 7 — (4AG) No. 9:	Is the resistance 1 M- or more-	Diagnostic Chart with Trouble Code > DTC B1617 FRONT SUB SENSOR LH LOST COMMUNICATION	Replace the airbag main 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 B1617 displayed-	Replace the front sub sensor LH. Front Sub Sensor > REMOVAL Replace the airbag control module if not operating normally even after replacing the sensor. Airbag Control Module > REMOVAL	Diagnostic Chart with Trouble Code > DTC B1617 FRONT SUB SENSOR LH LOST COMMUNICATION
5.CHECK FOR ANY OTHER DTC ON DISPLAY.	Is any other DTC displayed-	Check DTC using “List of Diagnostic Trouble Code”. List of Diagnostic Trouble Code (DTC)	Finish the diagnosis.

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