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Subaru Crosstrek Service Manual: Dtc b1812 short in driver s airbag dual stage - 2nd step (to ground)

Subaru Crosstrek Service Manual / Airbag system (diagnostics) / Diagnostic chart with trouble code / Dtc b1812 short in driver s airbag dual stage - 2nd step (to ground)

AIRBAG SYSTEM (DIAGNOSTICS) > Diagnostic Chart with Trouble Code

DTC B1812 SHORT IN DRIVER’S AIRBAG DUAL STAGE - 2ND STEP (TO GROUND)

Diagnosis start condition:

Ignition voltage is 10 V to 16 V.

DTC detecting condition:

Airbag main harness circuit is shorted to ground.

Airbag module harness (driver’s side) circuit is shorted to ground.

Roll connector circuit is shorted to ground.

Driver’s airbag module is faulty.

Airbag control module is faulty.

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 driver’s airbag module.

Is there poor contact?

Replace the airbag harness.

Diagnostic Chart with Trouble Code > DTC B1812 SHORT IN DRIVER’S AIRBAG DUAL STAGE - 2ND STEP (TO GROUND)">Go to Step 2.

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 B1812 SHORT IN DRIVER’S AIRBAG DUAL STAGE - 2ND STEP (TO GROUND)">Go to Step 3.

3.CHECK ROLL CONNECTOR.

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) Disconnect the connector (AB66) from the driver’s knee airbag module.

4) Disconnect the airbag resistor from the connector (2N) in test harness N and from the connector (2Q) in test harness Q.

5) Measure the resistance between connector (2N) in the test harness N and chassis ground.

Connector & terminal

(2N) No. 1 — Chassis ground:

(2N) No. 2 — Chassis ground:

Is the resistance 1 M? or more?

Diagnostic Chart with Trouble Code > DTC B1812 SHORT IN DRIVER’S AIRBAG DUAL STAGE - 2ND STEP (TO GROUND)">Go to Step 4.

Replace the roll connector. Roll Connector">

4.CHECK AIRBAG MAIN HARNESS (DRIVER’S AIRBAG HARNESS).

1) Disconnect the test harness N from connector (AB38).

2) Disconnect the test harness Q from connector (AB37).

3) Remove the console front panel and disconnect the connector (AB9).

4) Disconnect the connectors (AB6, AB17, AB18) from the airbag control module, and connect the connector (1AG) in the test harness AG.

5) Measure the resistance between connector (3AG) in the test harness AG and chassis ground.

Connector & terminal

(3AG) No. 2 — Chassis ground:

(3AG) No. 4 — Chassis ground:

Is the resistance 1 M? or more?

Diagnostic Chart with Trouble Code > DTC B1812 SHORT IN DRIVER’S AIRBAG DUAL STAGE - 2ND STEP (TO GROUND)">Go to Step 5.

Replace the airbag main harness along with body harness.

5.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 B1812 displayed?

Replace the airbag control module. Airbag Control Module">

Diagnostic Chart with Trouble Code > DTC B1812 SHORT IN DRIVER’S AIRBAG DUAL STAGE - 2ND STEP (TO GROUND)">Go to Step 6.

6.CHECK FOR ANY OTHER DTC ON DISPLAY.

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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