Honda Civic manuals

Subaru Legacy Service Manual: Dtc b1697 lost communication with door sensor lh

DIAGNOSIS START CONDITION:

Ignition voltage is 10 V to 16 V.

DTC DETECTING CONDITION:

Front door impact sensor LH communication error (open/short circuit or connector connection failure between airbag CM and front door impact sensor, front door impact sensor internal communication circuit failure, CM internal communication circuit failure)

CAUTION:

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

WIRING DIAGRAM:

NOTE:

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

Airbag system Airbag System > WIRING DIAGRAM

STEPCHECKYESNO

1.CHECK DTC.

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

Is DTC B1627 or B1637 displayed-

Perform the diagnosis according to DTC.

Diagnostic Chart with Trouble Code > DTC B1697 LOST COMMUNICATION WITH DOOR SENSOR LH

2.CHECK POOR CONTACT OF CONNECTORS.

Check for poor contact of the connectors between the airbag control module and the front door impact sensor LH.

Is there poor contact-

Replace the airbag rear harness and the door harness.

Diagnostic Chart with Trouble Code > DTC B1697 LOST COMMUNICATION WITH DOOR SENSOR LH

3.CHECK AIRBAG REAR HARNESS AND DOOR HARNESS (BETWEEN CURTAIN AIRBAG SENSOR LH AND FRONT DOOR IMPACT SENSOR LH) (OPEN CIRCUIT).

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 (AB5) from seat cushion airbag module LH.

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

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

6) Disconnect the connector (AB32) from curtain airbag sensor LH, and connect the connector (2V) in test harness V to connector (AB32).

7) Disconnect the connector (AB58) from front door impact sensor LH.

8) Using a probe, measure the resistance between the connector (3V) terminal in test harness V and connector (AB58) terminal. General Description > PREPARATION TOOL

CAUTION:

When measuring the resistance, make sure to insert the probe from the inspection hole of the connector. Also, do not insert the probe forcibly.

Connector & terminal

(3V) No. 4 — (AB58) No. 1:

(3V) No. 5 — (AB58) No. 2:

Is the resistance less than 10 --

Diagnostic Chart with Trouble Code > DTC B1697 LOST COMMUNICATION WITH DOOR SENSOR LH

Check the door harness, and if any fault is found, replace the harness. If there is no fault, replace the airbag rear harness together with body harness.

4.CHECK AIRBAG REAR HARNESS AND DOOR HARNESS (BETWEEN CURTAIN AIRBAG SENSOR LH AND FRONT DOOR IMPACT SENSOR LH) (SHORTED TO GROUND AND SHORTED BETWEEN LINES).

Measure the resistance between connector (3V) in test harness V and chassis ground, and the resistance between connector (3V) terminals in test harness V.

Connector & terminal

(3V) No. 4 — Chassis ground:

(3V) No. 5 — Chassis ground:

(3V) No. 4 — (3V) No. 5:

Is the resistance 1 M- or more-

Diagnostic Chart with Trouble Code > DTC B1697 LOST COMMUNICATION WITH DOOR SENSOR LH

Check the door harness, and if any fault is found, replace the harness. If there is no fault, replace the airbag rear harness together with body harness.

5.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 B1697 displayed-

Diagnostic Chart with Trouble Code > DTC B1697 LOST COMMUNICATION WITH DOOR SENSOR LH

Diagnostic Chart with Trouble Code > DTC B1697 LOST COMMUNICATION WITH DOOR SENSOR LH

6.CHECK FRONT DOOR IMPACT SENSOR LH.

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

2) Disconnect the connector (AB58) from front door impact sensor LH. Front Door Impact Sensor > REMOVAL

3) Temporarily connect a new front door impact sensor to the connector (AB58).

4) Connect all connectors.

5) Clear the memory. Clear Memory Mode

6) Perform the Inspection Mode. Inspection Mode

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

Is DTC B1697 displayed-

Diagnostic Chart with Trouble Code > DTC B1697 LOST COMMUNICATION WITH DOOR SENSOR LH

Replace the front door impact sensor LH. Front Door Impact Sensor > REMOVAL

7.CHECK CURTAIN AIRBAG SENSOR LH.

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

2) Restore the front door impact sensor LH back to the original position. Front Door Impact Sensor > REMOVAL

3) Replace the curtain airbag sensor RH by the curtain airbag sensor LH. Curtain Airbag Sensor > REMOVAL

4) Connect all connectors.

5) Clear the memory. Clear Memory Mode

6) Perform the Inspection Mode. Inspection Mode

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

Is DTC B1697 displayed-

Replace the curtain airbag sensor LH. Curtain Airbag Sensor > REMOVAL

Diagnostic Chart with Trouble Code > DTC B1697 LOST COMMUNICATION WITH DOOR SENSOR LH

8.CHECK AIRBAG CONTROL MODULE.

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

2) Restore the curtain airbag sensors RH and LH back to their original position. Curtain Airbag Sensor > 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 B1697 displayed-

Replace the airbag control module. Airbag Control Module > REMOVAL

Diagnostic Chart with Trouble Code > DTC B1697 LOST COMMUNICATION WITH DOOR SENSOR LH

9.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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