AIRBAG SYSTEM (DIAGNOSTICS) > Diagnostic Chart with Trouble Code

DTC 91 CURTAIN AIRBAG MODULE RH FAILURE

DTC DETECTING CONDITION:

• Curtain airbag harness (RH) is faulty.

• Curtain airbag module (RH) 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 the 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 OF CONNECTORS.

Check for poor contact of the connectors between the airbag control module, curtain airbag module RH and the curtain airbag sensor RH.

Is there poor contact?

Replace the airbag rear harness along with body harness.

2.CHECK CURTAIN AIRBAG MODULE.

1) Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 20 seconds or more.

2) Disconnect the connector (AB33), and connect the connector (1N) in test harness N to connector (AB33).

3) Connect the airbag resistor to the connector (2N) of test harness N.

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 curtain airbag module (RH).

3.CHECK AIRBAG REAR HARNESS (CURTAIN AIRBAG MODULE HARNESS RH).

1) Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 20 seconds or more.

2) Disconnect the connector (AB26) from seat belt pretensioner (RH).

3) Disconnect connector (AB24) from side airbag module (RH).

4) Disconnect the connector (AB30) from lap seat belt pretensioner (RH).

5) Disconnect the airbag resistor from test harness N.

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

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

8) Measure the resistance between connector (6AG) in the test harness AG and connector (2N) in the test harness N.

Connector & terminal

(6AG) No. 6 — (2N) No. 1:

(6AG) No. 8 — (2N) No. 2:

Is the resistance less than 10 Ω?

Replace the airbag rear harness along with body harness.

4.CHECK AIRBAG REAR HARNESS (CURTAIN AIRBAG MODULE HARNESS RH).

Measure the resistance between connector (6AG) terminals in the test harness AG.

Connector & terminal

(6AG) No. 6 — (6AG) No. 8:

Is the resistance 1 MΩ or more?

Replace the airbag rear harness along with body harness.

5.CHECK AIRBAG REAR HARNESS (CURTAIN AIRBAG MODULE HARNESS RH).

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

Connector & terminal

(6AG) No. 6 — Chassis ground:

(6AG) No. 8 — 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) Erase 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.