Subaru Crosstrek Service Manual: Dtc b1803 short in driver s airbag (to +b)

Diagnosis start condition:

Ignition voltage is 10 V to 16 V.

DTC detecting condition:

• Airbag main harness circuit is shorted to power supply.

• Airbag module harness (driver’s side) circuit is shorted to power supply.

• Roll connector circuit is shorted to power supply.

• 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 B1803 SHORT IN DRIVER’S AIRBAG (TO +B)">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 B1803 SHORT IN DRIVER’S AIRBAG (TO +B)">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 driver’s knee airbag module connector (AB66).

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 voltage between connector (2Q) in the test harness Q and chassis ground.

Connector & terminal

(2Q) No. 1 (+) — Chassis ground (−):

(2Q) No. 2 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Diagnostic Chart with Trouble Code > DTC B1803 SHORT IN DRIVER’S AIRBAG (TO +B)">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) Connect the battery ground terminal and turn the ignition switch to ON.

6) Measure the voltage between connector (3AG) in the test harness AG and chassis ground.

Connector & terminal

(3AG) No. 1 (+) — Chassis ground (−):

(3AG) No. 3 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Diagnostic Chart with Trouble Code > DTC B1803 SHORT IN DRIVER’S AIRBAG (TO +B)">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 B1803 displayed?

Replace the airbag control module. Airbag Control Module">

Diagnostic Chart with Trouble Code > DTC B1803 SHORT IN DRIVER’S AIRBAG (TO +B)">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 b1802 short in driver s airbag (to ground)

Dtc b1805 short in passenger s airbag

Other materials:

Adjustment
WIPER AND WASHER SYSTEMS > Front Washer Nozzle and HoseADJUSTMENT1. NOZZLE - WINDSHIELD WASHER1. Turn the wiper switch to OFF position.2. While the vehicle is at a standstill, insert a precision screwdriver (A) or equivalent wrapped with protective tape into the clearance on the upper/lower side ...

Welcome screen and Good-bye screen
When the driver's door is opened and closed after unlocking the door, the welcome screen will appear on the multi information display for approximately 20 seconds. When the ignition switch is turned to the "LOCK"/"OFF" position, the multi information display gradually turns off (Good-bye s ...

Certification for the Hands-free system
This device complies with Part 15 of FCC Rules and Industry Canada's licenceexempt RSSs. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause u ...