Subaru Crosstrek Service Manual: Dtc b1836 open 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 open.

• 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 B1836 OPEN 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 B1836 OPEN 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) in the test harness AG and connector (2N) in the test harness N.

Connector & terminal

(6AG) No. 1 — (2N) No. 2:
(6AG) No. 3 — (2N) No. 1:

Is the resistance less than 10 ??

Diagnostic Chart with Trouble Code > DTC B1836 OPEN 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 B1836 displayed?

Replace the airbag control module. Airbag Control Module">

Diagnostic Chart with Trouble Code > DTC B1836 OPEN 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.

Dtc b1835 short in curtain airbag lh squib circuit

Dtc b1837 short in curtain airbag lh squib circuit (to ground)

Other materials:

Removal
EXTERIOR/INTERIOR TRIM > Front GrilleREMOVAL1. Disconnect the ground cable from battery. NOTE">2. Remove the bumper face - front. Front Bumper > REMOVAL">3. Remove the front grille assembly.(1) Remove the screws from the back side of the bumper face - front.(2) Release the cl ...

Wiring diagram
POWER ASSISTED SYSTEM (POWER STEERING) (DIAGNOSTICS) > Control Module I/O SignalWIRING DIAGRAM(1)Battery(5)Engine control module (ECM)(9)Torque sensor (main & sub)(2)Ignition switch(6)Power steering control module(10)CAN communication(3)STEERING warning light (combination meter)(7)Motor(11)VD ...

Assembly
CONTINUOUSLY VARIABLE TRANSMISSION(TR580) > Oil Pump ChainASSEMBLY1. DRIVE SPROCKET1. Using the ST, install the ball bearing.NOTE:Use a new ball bearing.ST 499755502PRESS SNAP RING2. Install the snap ring. ...