Honda Civic manuals

Subaru Legacy Service Manual: Dtc b1656 front buckle switch lh failure

DIAGNOSIS START CONDITION:

Ignition voltage is 10 V to 16 V.

DTC DETECTING CONDITION:

Buckle switch LH failure (open, short, unit failure), seat harness malfunction (open, short), occupant detection system failure

WIRING DIAGRAM:

Occupant detection system Occupant Detection System > WIRING DIAGRAM

STEPCHECKYESNO

1.CHECK DTC.

Read the DTC. (Current malfunction) Read Diagnostic Trouble Code (DTC)

Is DTC other than B1656 displayed-

Perform the diagnosis according to DTC.

Diagnostic Chart with Trouble Code > DTC B1656 FRONT BUCKLE SWITCH LH FAILURE

2.CHECK POOR CONTACT OF CONNECTORS.

Check for poor contact of the connectors between the airbag control module and the buckle switch.

Is there poor contact-

When the connector is not fully connected, reconnect the connector correctly. Replace the airbag rear harness together with body harness, if the connector is faulty.

Diagnostic Chart with Trouble Code > DTC B1656 FRONT BUCKLE SWITCH LH FAILURE

3.CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND BUCKLE SWITCH) (OPEN CIRCUIT).

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

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

3) Disconnect the connector (AB5) from seat cushion airbag module LH.

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

5) Disconnect the connector (AB19) of the side airbag module LH.

6) Disconnect the connectors (AB6, AB17, AB18) from airbag control module.

7) Connect the connector (1AD) in test harness AD AV to the connectors (AB6, AB17, AB18).

8) Connect the connector (2AD) in test harness AD AV and the connector (1AG) in test harness AG.

9) Disconnect the buckle switch connector (R108).

10) Measure the resistance between connector (6AG) in the test harness AG and connector (R108).

CAUTION:

Connect terminal (1AW) in test harness AW to connector (R108) terminal, and apply the tester to terminal (2AW).

Connector & terminal

(6AG) No. 17 — (R108) No. 1:

(6AG) No. 2 — (R108) No. 2:

Is the resistance less than 10 --

Diagnostic Chart with Trouble Code > DTC B1656 FRONT BUCKLE SWITCH LH FAILURE

Replace the airbag main harness along with body harness.

4.CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND BUCKLE SWITCH) (SHORTED TO GROUND).

Measure the resistance between connector (6AG) in the test harness AG and chassis ground.

Connector & terminal

(6AG) No. 17 — Chassis ground:

(6AG) No. 2 — Chassis ground:

Is the resistance 1 M- or more-

Diagnostic Chart with Trouble Code > DTC B1656 FRONT BUCKLE SWITCH LH FAILURE

Replace the airbag main harness along with body harness.

5.CHECK AIRBAG REAR HARNESS (BETWEEN AIRBAG CONTROL MODULE AND BUCKLE SWITCH) (SHORTED TO POWER SUPPLY).

1) Turn the ignition switch to ON.

2) Measure the resistance between connector (6AG) in the test harness AG and chassis ground.

Connector & terminal

(6AG) No. 17 (+) — Chassis ground (−):

(6AG) No. 2 (+) — Chassis ground (−):

Is the voltage less than 1 V-

Diagnostic Chart with Trouble Code > DTC B1656 FRONT BUCKLE SWITCH LH FAILURE

Replace the airbag main harness along with body harness.

6.REPLACE BUCKLE SWITCH AND CHECK AIRBAG CONTROL MODULE AFTER REPLACEMENT.

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

2) Replace the buckle switch. Front Seat Belt > REMOVAL

3) Connect all connectors.

4) Clear the memory. Clear Memory Mode

5) Perform the Inspection Mode. Inspection Mode

6) Read the DTC. (Current malfunction) Read Diagnostic Trouble Code (DTC)

Is DTC B1656 displayed-

Replace the airbag control module. Airbag Control Module > REMOVAL

Diagnostic Chart with Trouble Code > DTC B1656 FRONT BUCKLE SWITCH LH FAILURE

7.CHECK FOR ANY OTHER DTC ON DISPLAY.

Read the DTC. (Current malfunction) Read Diagnostic Trouble Code (DTC)

Is any other DTC displayed-

Check DTC using “List of Diagnostic Trouble Code”. List of Diagnostic Trouble Code (DTC) > LIST

Finish the diagnosis.

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Other materials:

Inspection
Unit inspectionPreparation tool:Circuit tester1. Check the resistance between connector terminals.Terminal No.Inspection conditionsStandard1 — 2OPENLess than 5 -CLOSE1 M- or more2. If the inspection result is not within the standard, replace the button - opener rear gate. ...

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