Subaru Crosstrek Service Manual: Dtc b1835 short in curtain airbag lh squib circuit

Diagnosis start condition:

Ignition voltage is 10 V to 16 V.

DTC detecting condition:

• Curtain airbag harness (LH) circuit is shorted.

• Curtain 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, curtain airbag module LH and the curtain airbag sensor LH.

Is there poor contact?

Replace the airbag rear harness along with body harness.

Diagnostic Chart with Trouble Code > DTC B1835 SHORT IN CURTAIN AIRBAG LH SQUIB CIRCUIT">Go to Step 2.

2.CHECK CURTAIN 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 (AB31) from curtain airbag module (LH).

3) Connect the connector (1N) in the test harness N to the connector (AB31).

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 6 seconds and go off?

Replace the curtain airbag module (LH). Curtain Airbag Module">

Diagnostic Chart with Trouble Code > DTC B1835 SHORT IN CURTAIN AIRBAG LH SQUIB CIRCUIT">Go to Step 3.

3.CHECK AIRBAG REAR HARNESS (CURTAIN 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 connector (AB19) from side airbag module (LH).

4) Disconnect the airbag resistor from test harness N.

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 (6AG) terminals in test harness AG.

Connector & terminal

(6AG) No. 1 — (6AG) No. 3:

Is the resistance 1 M? or more?

Diagnostic Chart with Trouble Code > DTC B1835 SHORT IN CURTAIN AIRBAG LH SQUIB CIRCUIT">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 B1835 displayed?

Replace the airbag control module. Airbag Control Module">

Diagnostic Chart with Trouble Code > DTC B1835 SHORT IN CURTAIN AIRBAG LH SQUIB CIRCUIT">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.

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Other materials:

Precautions against vehicle modification
WARNING To avoid accidental activation of the system or rendering the system inoperative, which may result in serious injury, no modifications should be made to any components or wiring of the SRS airbag system. This includes following modifications. Installation of custom steering wh ...

Inspection
LAN SYSTEM (DIAGNOSTICS) > General DescriptionINSPECTION1. INSPECTION WITHOUT USING CAN DIAGNOSTICBefore performing diagnosis, check the following items that might affect troubles of each module.1. Check the battery. Battery > INSPECTION">2. Check the fuse condition.Make sure that amp ...

Installation
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