Honda Civic manuals

Subaru Legacy Service Manual: Dtc b1773 belt tension sensor circuit open

DTC DETECTING CONDITION:

Passenger’s seat belt tension sensor is faulty.

Airbag main harness circuit is open or shorted.

Occupant detection control module is faulty.

CAUTION:

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

WIRING DIAGRAM:

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

Occupant detection system Occupant Detection System > WIRING DIAGRAM

STEPCHECKYESNO

1.CHECK POOR CONTACT OF CONNECTORS.

Check for poor contact of the connectors between the occupant detection control module and belt tension sensor.

Is there poor contact-

When the connector is not fully connected, reconnect the connector correctly. Replace the faulty harness if the connector is faulty. (Replace the airbag rear harness along with body harness, or replace the occupant detection harness (seat harness).)

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1773 BELT TENSION SENSOR CIRCUIT OPEN

2.CHECK BELT TENSION SENSOR.

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

2) Disconnect the belt tension sensor connector (AB56) from the airbag harness.

3) Connect the connector (1AX) in the test harness AX to the connector (AB56).

4) Connect the connector (2AX) in the test harness AX and the test harness AC.

5) Connect the ground cable to battery.

Does the airbag warning light illuminate for approximately 6 seconds and go off-

Replace the seat belt outer. Front Seat Belt > REMOVAL

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1773 BELT TENSION SENSOR CIRCUIT OPEN

3.CHECK AIRBAG HARNESS.

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

2) Disconnect the test harness AC from the connector (2AX) in test harness AX.

3) Connect the connector (2AX) in test harness AX and the connector (1AD) in test harness AD.

4) Disconnect the airbag harness connector (AB53), and connect the connector (1AW) of test harness AW.

5) Measure the resistance between connector (2AD) in test harness AD and connector (AB53).

CAUTION:

Connect terminal (1AW) in the test harness AW to connector (AB53) terminal, and apply the tester to terminal (2AW).

Connector & terminal

(AB53) No. 2 — (2AD) No. 3:

(AB53) No. 4 — (2AD) No. 2:

(AB53) No. 3 — (2AD) No. 1:

Is the resistance less than 10 --

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1773 BELT TENSION SENSOR CIRCUIT OPEN

Replace the airbag harness along with chassis harness.

4.CHECK AIRBAG HARNESS.

Measure the resistance between connector (AB53) terminals and between connector (AB53) and chassis ground.

CAUTION:

Connect terminal (1AW) in the test harness AW to connector (AB53) terminal, and apply the tester to terminal (2AW).

Connector & terminal

(AB53) No. 2 — (2AD) No. 2:

(AB53) No. 2 — (2AD) No. 1:

(AB53) No. 3 — (2AD) No. 3:

(AB53) No. 3 — (2AD) No. 2:

(AB53) No. 4 — (2AD) No. 3:

(AB53) No. 4 — (2AD) No. 1:

(AB53) No. 2 — Chassis ground:

(AB53) No. 3 — Chassis ground:

(AB53) No. 4 — Chassis ground:

Is the resistance 1 M- or more-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1773 BELT TENSION SENSOR CIRCUIT OPEN

Replace the airbag harness along with chassis harness.

5.CHECK AIRBAG HARNESS.

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

2) Measure the voltage between connector (AB53) and chassis ground.

CAUTION:

Connect terminal (1AW) in the test harness AW to connector (AB53) terminal, and apply the tester to terminal (2AW).

Connector & terminal

(2AD) No. 1 (+) — Chassis ground (−):

(2AD) No. 3 (+) — Chassis ground (−):

Is the voltage 1 V or less-

Check the seat harness, and if any fault is found, replace the seat harness. If the fault is not fixed, replace the occupant detection system. Front Seat > DISASSEMBLY

Replace the airbag harness along with chassis harness.

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