AIRBAG SYSTEM (DIAGNOSTICS) > Diagnostic Chart with Trouble Code

DTC 42 SIDE AIRBAG LH FAILURE

DTC DETECTING CONDITION:

• Side airbag harness (LH) is faulty.

• 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 terminal from battery, and wait 20 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 IN 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 20 seconds or more.

2) Disconnect the connectors (AB20) and (AB19), and connect the test harness AJ connector (1AJ) 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 six 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 20 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.

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

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

7) Measure the resistance between the test harness AG connector (5AG) and the test harness AJ connector (3AJ).

Connector & terminal

(5AG) No. 1 — (3AJ) No. 1:

(5AG) No. 3 — (3AJ) No. 2:

Is the resistance less than 10 Ω?

Replace the airbag rear harness along with body harness.

4.CHECK AIRBAG REAR HARNESS (SIDE AIRBAG MODULE HARNESS LH).

Measure the resistance between connector (5AG) terminals in the test harness AG.

Connector & terminal

(5AG) No. 1 — (5AG) No. 3:

Is the resistance 1 MΩ or more?

Replace the airbag rear harness along with body harness.

5.CHECK AIRBAG REAR HARNESS (SIDE AIRBAG MODULE HARNESS LH).

Measure the resistance between connector (5AG) in the test harness AG and chassis ground.

Connector & terminal

(5AG) No. 1 — Chassis ground:

(5AG) No. 3 — Chassis ground:

Is the resistance 1 MΩ or more?

Replace the airbag rear harness along with body harness.

6.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.

7.CHECK FOR ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

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

Finish the diagnosis.