Subaru Crosstrek Service Manual: Dtc b1903 short in front p/t rh (to +b)

Diagnosis start condition:

Ignition voltage is 10 V to 16 V.

DTC detecting condition:

• Seat belt pretensioner (RH) circuit is shorted to power supply.

• Pretensioner (RH) is faulty.

• Pretensioner harness (RH) is faulty.

• Airbag control module is faulty.

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

1.CHECK POOR CONTACT OF CONNECTORS.

Check for poor contact of the connectors between the airbag control module and the seat belt pretensioner RH.

Is there poor contact?

Replace the airbag rear harness along with body harness.

Diagnostic Chart with Trouble Code > DTC B1903 SHORT IN FRONT P/T RH (TO +B)">Go to Step 2.

2.CHECK SEAT BELT PRETENSIONER.

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

2) Disconnect the connector (AB26) from seat belt pretensioner (RH).

3) Connect the connector (1N) in the test harness N to the connector (AB26).

4) Connect the airbag resistor to the connector (2N) of test harness N.

5) 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 seat belt pretensioner (RH). Front Seat Belt">

Diagnostic Chart with Trouble Code > DTC B1903 SHORT IN FRONT P/T RH (TO +B)">Go to Step 3.

3.CHECK AIRBAG REAR HARNESS (PRETENSIONER HARNESS RH).

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

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

3) Disconnect connector (AB24) from side airbag module (RH).

4) Disconnect the connector (AB33) from curtain airbag module (RH).

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

6) Connect the connector (1AG) in the test harness AG to the connectors (AB6, AB17, AB18).

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

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

Connector & terminal

(3AG) No. 20 (+) — Chassis ground (−):

(3AG) No. 18 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Diagnostic Chart with Trouble Code > DTC B1903 SHORT IN FRONT P/T RH (TO +B)">Go to Step 4.

Replace the airbag rear harness along with body harness.

4.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 B1903 displayed?

Replace the airbag control module. Airbag Control Module">

Diagnostic Chart with Trouble Code > DTC B1903 SHORT IN FRONT P/T RH (TO +B)">Go to Step 5.

5.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 b1902 short in front p/t rh (to ground)

Dtc b16f0 passenger s airbag off indicator failure

Other materials:

Oil pressure warning light
If this light illuminates when the engine is running, it may indicate that the engine oil pressure is low and the lubricating system is not working properly. If the light illuminates while driving or does not turn off after the engine starts, stop the engine at the first safe opportunity ...

Inspection
GLASS/WINDOWS/MIRRORS > Remote Control Mirror SystemINSPECTION1. SYMPTOM CHARTSymptomsInspection orderAll function does not operate.(1) Check the fuse.(2) Check the remote control mirror switch.(3) Check the wiring harness.One side of the mirror motor does not operate.(1) Check the remote control ...

Models with "keyless access with push-button start system"
NOTE For more details, refer to the Owner's Manual supplement for the remote engine start system. Access key Lock button An access key can be used as the remote engine start transmitter. Operate the lock button to start or stop the engine as follows. Before starting the engine Befo ...