AIRBAG SYSTEM (DIAGNOSTICS) > Diagnostic Chart with Trouble Code

DTC 4B SIDE AIRBAG LH FAILURE

DTC DETECTING CONDITION:

• Side airbag harness (LH) circuit is shorted.

• Side airbag module (LH) is faulty.

• Airbag control module is faulty.

CAUTION:

• Before diagnosing the airbag system, be sure to turn the ignition switch to OFF, disconnect the ground cable from battery, and wait 60 seconds or more before starting to work.

• When replacing the airbag module, seat belt pretensioner, lap seat belt pretensioner, roll connector, control module and sensor, reconnect each part and check that the warning light operates properly.

• When inspecting the airbag main harness, disconnect the airbag module connectors of the driver’s and passenger’s seats for safety.

• When inspecting the airbag rear harness, disconnect the side airbag module connector, curtain airbag module connector, seat belt pretensioner and lap seat belt pretensioner connector for safety reasons.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK POOR CONTACT OF CONNECTORS.

Check for poor contact of the connectors between the airbag control module, side airbag module LH and the side airbag sensor LH.

Is there poor contact?

Replace the airbag rear harness along with body harness.

2.CHECK SIDE 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 (AB19) from the side airbag module (LH), and connect the connector (1AJ) in test harness AJ to the connector (AB19).

3) Connect the airbag resistor to the test harness AJ connector (3AJ).

4) 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 side airbag module (LH).

3.CHECK AIRBAG REAR HARNESS (SIDE 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 the connector (AB31) from curtain airbag module (LH).

4) Disconnect the airbag resistor from test harness AJ.

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

6) Connect the connector (1AH) in the test harness AH to the connectors (AB6, AB17, AB18).

7) Connect the connector (2AH) in the test harness AH and the connector (1AG) in the test harness AG.

8) Measure the resistance between connector (4AG) terminals in test harness AG.

Connector & terminal

(4AG) No. 8 — (4AG) No. 10:

Is the resistance 1 MΩ or more?

Replace the airbag rear harness along with body harness.

4.CHECK AIRBAG CONTROL MODULE.

1) Connect all connectors.

2) Clear the memory.

3) Perform the Inspection Mode.

4) Read the DTC.

Is the same DTC displayed?

Replace the airbag control module.

5.CHECK FOR ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

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

Finish the diagnosis.