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Subaru Legacy Service Manual: Dtc b1816 open in passenger's airbag dual stage - 2nd step

Subaru Legacy Service Manual / Airbag system (diagnostics) / Diagnostic chart with trouble code / Dtc b1816 open in passenger's airbag dual stage - 2nd step

DIAGNOSIS START CONDITION:

Ignition voltage is 10 V to 16 V.

DTC DETECTING CONDITION:

Open circuit failure (open circuit in main harness, open circuit in passenger’s airbag, open circuit in airbag CM internal circuit, connector connection failure)

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

STEPCHECKYESNO

1.CHECK POOR CONTACT OF CONNECTORS.

Check for poor contact of the connectors between the airbag control module and the passenger’s airbag module.

Is there poor contact-

Replace the airbag main harness.

Diagnostic Chart with Trouble Code > DTC B1816 OPEN IN PASSENGER'S AIRBAG DUAL STAGE - 2ND STEP

2.CHECK AIRBAG MAIN HARNESS (PASSENGER’S AIRBAG HARNESS).

1) Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.

2) Disconnect the connectors (AB7) and (AB2).

3) Disconnect the passenger’s airbag module connector (AB9).

4) Disconnect the connectors (AB6, AB17, AB18) from airbag control module.

5) Using a probe, measure the resistance between the terminals of connector (AB9). General Description > PREPARATION TOOL

CAUTION:

When measuring the resistance, make sure that the probe is inserted from the back side (harness side) of the connector. Also, do not insert the probe forcibly.

Connector & terminal

(AB9) No. 3 — (AB9) No. 4:

Is the resistance less than 10 --

Diagnostic Chart with Trouble Code > DTC B1816 OPEN IN PASSENGER'S AIRBAG DUAL STAGE - 2ND STEP

Replace the airbag main harness along with body harness.

3.CHECK AIRBAG CONTROL MODULE.

1) Connect the connector other than passenger’s airbag module connector (AB9).

2) Using a probe, short the terminals No. 3 and No. 4 of connector (AB9). General Description > PREPARATION TOOL

CAUTION:

When shorting the terminals, make sure that the probe is inserted from the back side (harness side) of the connector. Also, do not insert the probe forcibly.

Connector & terminal

(AB9) No. 3 — (AB9) No. 4:

3) Connect the battery ground terminal and turn the ignition switch to ON.

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 B1815 displayed-

Diagnostic Chart with Trouble Code > DTC B1816 OPEN IN PASSENGER'S AIRBAG DUAL STAGE - 2ND STEP

Replace the airbag control module. Airbag Control Module > REMOVAL

4.CHECK PASSENGER’S AIRBAG MODULE.

1) Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more.

2) Connect the passenger’s airbag module connector (AB9).

3) Connect the battery ground terminal and turn the ignition switch to ON.

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 B1816 displayed-

Replace the passenger’s airbag module. Passenger’s Airbag Module > REMOVAL

Diagnostic Chart with Trouble Code > DTC B1816 OPEN IN PASSENGER'S AIRBAG DUAL STAGE - 2ND STEP

5.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.

Dtc b1817 short in passenger's airbag dual stage - 2nd step (to ground)
DIAGNOSIS START CONDITION:Ignition voltage is 10 V to 16 V.DTC DETECTING CONDITION:GND short circuit failure (shorted to ground in main harness, shorted to ground in passenger’s airbag, shorted ...

Dtc b1815 short in passenger's airbag dual stage - 2nd step
DIAGNOSIS START CONDITION:Ignition voltage is 10 V to 16 V.DTC DETECTING CONDITION:Shorted between +/− lines (shorted between main harness lines, shorted between passenger’s airbag lines, ...

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