Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b1804 short in driver's airbag

Subaru Legacy BN/BS (2015-2019) Service Manual / Airbag system (diagnostics) / Diagnostic chart with trouble code / Dtc b1804 short in driver's airbag

DIAGNOSIS START CONDITION:

Ignition voltage is 10 V to 16 V.

DTC DETECTING CONDITION:

Short circuit between driver’s airbag circuit and other circuit

CAUTION:

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

NOTE:

Prior to starting work, prepare two AIRBAG RESISTORs (98299PA040).

WIRING DIAGRAM:

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 driver’s airbag module.	Is there poor contact-	Replace the airbag harness.	Diagnostic Chart with Trouble Code > DTC B1804 SHORT IN DRIVER'S AIRBAG
2.CHECK DRIVER’S AIRBAG MODULE. 1) Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more. 2) Remove the driver’s airbag module. 3) Connect the connector (1N) in the test harness N to the connector (AB38). 4) Connect the airbag resistor to the connector (2N) of test harness N. 5) Connect the connector (1Q) in the test harness Q to connector (AB37). 6) Connect the airbag resistor to the connector (2Q) in the test harness Q. 7) Connect the battery ground terminal and turn the ignition switch to ON.	Does the airbag warning light illuminate for six seconds and go off-	Replace the driver’s airbag module. Driver’s Airbag Module	Diagnostic Chart with Trouble Code > DTC B1804 SHORT IN DRIVER'S AIRBAG
3.CHECK ROLL CONNECTOR (SHORTED BETWEEN LINES). 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 connector (AB7) from (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 airbag resistor from the connector (2N) in test harness N and from the connector (2Q) in test harness Q. 8) Measure the resistance between connector (2Q) in the test harness Q and all connector terminals in the test harness AG. Connector & terminal (2Q) No. 1 — All terminals in test harness AG (except for (3AG) No. 3): (2Q) No. 2 — All terminals in test harness AG (except for (3AG) No. 1):	Is the resistance 1 M- or more-	Diagnostic Chart with Trouble Code > DTC B1804 SHORT IN DRIVER'S AIRBAG	Roll connector Roll Connector and faulty harness need to be replaced. (Replace the airbag main harness along with body harness. Or replace the airbag rear harness along with body harness.)
4.CHECK AIRBAG MAIN HARNESS (DRIVER’S AIRBAG HARNESS) (SHORTED BETWEEN LINES). 1) Disconnect the test harness N from connector (AB38). 2) Disconnect the test harness Q from connector (AB37). 3) Measure the resistance between connector (3AG) in the test harness AG and all connector terminals in the test harness AG. Connector & terminal (3AG) No. 3 (+) — All terminals in test harness AG: (3AG) No. 1 (+) — All terminals in test harness AG:	Is the resistance 1 M- or more-	Replace the airbag control module Airbag Control Module > REMOVAL	Replace the faulty harness. (Replace the airbag main harness along with body harness. Or replace the airbag rear harness along with body harness.)

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Sun visors
To block out glare, swing down the visors. To use the sun visor at a side window, swing it down and move it sideways. With the sun visor positioned over the side window, you can slide the sun visor toward the rear to prevent glare through the gap between the sun visor and center pillar. ...