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:

Component
WHEEL AND TIRE SYSTEM > General DescriptionCOMPONENT(1)Screw(4)TPMS & keyless entry control moduleTightening torque: N·m (kgf-m, ft-lb)(2)Transmitter (snap in type)(5)TPMS CMT1:1.4 (0.14, 1.0)(3)Valve T2:7.5 (0.76, 5.5) T3:13 (1.33, 9.6)(1)TPMS & keyless entry control module(2) ...

Ignition switch light (if equipped)
For easy access to the ignition switch in the dark, the ignition switch light illuminates when the driver's door is opened or when the driver's door is unlocked using the remote keyless entry transmitter. The light remains illuminated for several tens of seconds and then gradually turns off ...

On-road and off-road driving
WARNING Always adapt your driving speed in the Subaru Ascent to match current road, traffic, and weather conditions. Excessive speed during cornering, braking, or sudden maneuvers can significantly increase the risk of accidents. Even though the Subaru Ascent is equipped with an advanced ...