Subaru Crosstrek Service Manual: Dtc b1827 short in side airbag lh (to ground)

Diagnosis start condition:

Ignition voltage is 10 V to 16 V.

DTC detecting condition:

• Side airbag harness (LH) circuit is shorted to ground.

• Side airbag module (LH) 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, side airbag module LH and the side airbag sensor LH.

Is there poor contact?

Replace the airbag rear harness along with body harness.

Diagnostic Chart with Trouble Code > DTC B1827 SHORT IN SIDE AIRBAG LH (TO GROUND)">Go to Step 2.

2.CHECK SIDE AIRBAG MODULE.

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

2) Disconnect the connector (AB19), and connect the connector (1AJ) in test harness AJ to connector (AB19).

3) Connect the airbag resistor to the test harness AJ connector (3AJ).

4) 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 side airbag module (LH). Side Airbag Module > REMOVAL">

Diagnostic Chart with Trouble Code > DTC B1827 SHORT IN SIDE AIRBAG LH (TO GROUND)">Go to Step 3.

3.CHECK AIRBAG REAR HARNESS (SIDE AIRBAG MODULE HARNESS LH).

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

2) Disconnect the connector (AB21) from seat belt pretensioner (LH).

3) Disconnect the connector (AB31) from curtain airbag module (LH).

4) Disconnect the airbag resistor from test harness.

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

Connector & terminal

(5AG) No. 1 — Chassis ground:

(5AG) No. 3 — Chassis ground:

Is the resistance 1 M? or more?

Diagnostic Chart with Trouble Code > DTC B1827 SHORT IN SIDE AIRBAG LH (TO GROUND)">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 B1827 displayed?

Replace the airbag control module. Airbag Control Module">

Diagnostic Chart with Trouble Code > DTC B1827 SHORT IN SIDE AIRBAG LH (TO GROUND)">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 b1826 open in side airbag lh

Dtc b1828 short in side airbag lh (to +b)

Other materials:

Installation
EXTERIOR/INTERIOR TRIM > Rear Gate GarnishINSTALLATIONCAUTION:Make sure that the harness grommet is securely installed.If not properly installed, this may cause leaks.Install each part in the reverse order of removal.Tightening torqueGarnish assembly - rear gate: 4.5 N·m (0.46 kgf-m, 3.3 f ...

Caution
TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS) > General DescriptionCAUTION1. SUPPLEMENTAL RESTRAINT SYSTEM “AIRBAG”Airbag system wiring harness is routed near the TPM control module.CAUTION:• Do not use electrical test equipment on any of the airbag system wiring harness circuit ...

Where to place a child restraint system
The following are SUBARU's recommendations on where to place a child restraint system in your vehicle. A: Front passenger's seat You should not install a child restraint system (including a booster seat) due to the hazard to children posed by the passenger's airbag. B: Rear seat, window- ...