Subaru Crosstrek Service Manual: Dtc b1801 open in driver s airbag

Diagnosis start condition:

Ignition voltage is 10 V to 16 V.

DTC detecting condition:

• Airbag main harness circuit is open.

• Airbag module harness (driver’s side) circuit is open.

• Roll connector is open.

• Driver’s airbag module is faulty.

• Airbag control module is faulty.

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

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

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 B1801 OPEN IN DRIVER’S AIRBAG">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 B1801 OPEN IN DRIVER’S AIRBAG">Go to Step 3.

3.CHECK ROLL CONNECTOR AND AIRBAG MAIN HARNESS (DRIVER’S AIRBAG HARNESS).

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

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

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

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

5) Disconnect the airbag resistor from the connector (2Q) of test harness Q.

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

7) Measure the resistance between connector (2Q) terminals in test harness Q.

Connector & terminal

(2Q) No. 1 — (2Q) No. 2:

Is the resistance less than 10 ??

Diagnostic Chart with Trouble Code > DTC B1801 OPEN IN DRIVER’S AIRBAG">Go to Step 5.

Diagnostic Chart with Trouble Code > DTC B1801 OPEN IN DRIVER’S AIRBAG">Go to Step 4.

4.CHECK ROLL CONNECTOR.

1) Remove the instrument panel lower cover and column cover, and disconnect the connector (AB7) from (AB2).

2) Measure the resistance between connector (2Q) terminals in test harness Q.

Connector & terminal

(2Q) No. 1 — (2Q) No. 2:

Is the resistance less than 10 ??

Replace the airbag main harness along with body harness.

Replace the roll connector. Roll Connector">

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 B1801 displayed?

Replace the airbag control module. Airbag Control Module">

Diagnostic Chart with Trouble Code > DTC B1801 OPEN IN DRIVER’S AIRBAG">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.

Dtc b1800 short in driver s airbag

Dtc b1802 short in driver s airbag (to ground)

Other materials:

Airbag warning light illumination pattern Inspection
AIRBAG SYSTEM (DIAGNOSTICS) > Airbag Warning Light Illumination PatternINSPECTIONTurn the ignition switch to ON, and confirm that the airbag warning light remains on for approx. 6 seconds then turns off afterwards.(1)Airbag warning light(2)Approx. 6 seconds(3)Ignition switch ON ...

Installation
LIGHTING SYSTEM > Rear Height SensorINSTALLATION1. Install each part in the reverse order of removal.Tightening torque:Sensor assembly - headlight beam leveler: 7.5 N·m (0.76 kgf-m, 5.5 ft-lb)Rear wheel: Except for C4 model120 N·m (12.24 kgf-m, 88.5 ft-lb)Rear wheel: C4 model100 N&m ...

Operation
VEHICLE DYNAMICS CONTROL (VDC) > VDC Sequence ControlOPERATION1. While the VDC sequence control is performed, the operation of the hydraulic unit can be checked using the brake tester or pressure gauge after the hydraulic unit solenoid valve is operated.2. VDC sequence control can be started by S ...