AIRBAG SYSTEM (DIAGNOSTICS) > Airbag Warning Light Failure

DETECTING CONDITION:

• Airbag warning light failure

• Airbag control module to airbag warning light circuit is shorted or open.

• Grounding circuit is faulty.

• Airbag control module is faulty.

• Improper connection of (AB1) and (B31)

• Improper connection of (AB3) to airbag control module

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

WIRING DIAGRAM:

• LHD model

• RHD model

STEP	CHECK	YES	NO
1.READ DTC. Read the DTC.	Is DTC displayed?	Perform the diagnosis according to DTC.
2.CHECK POOR CONTACT. 1) Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 20 seconds or more. 2) Confirm that there is solid connection between the airbag control module and connector (AB3).	Is there poor contact in connector (AB3)?	Replace the body harness along with airbag main harness or airbag control module, if the poor contact of connectors is not fixed.
3.CHECK AIRBAG MAIN HARNESS. 1) Remove the instrument panel lower cover and disconnect the connectors (AB26) and (AB2). 2) Disconnect the connectors (AB27) and (AB4) of the passenger’s airbag. 3) Disconnect the connector (AB3) from airbag control module, and connect the connector (1R) in the test harness R. 4) Connect the battery ground terminal and turn the ignition switch to ON. 5) Connect two connectors, (5R) and (6R) in the test harness R. NOTE: After the fault has been cleared, disconnect the connectors (5R) and (6R).	Does the airbag warning light go off?
4.CHECKING THE GROUND CIRCUIT. 1) Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 20 seconds or more. 2) Disconnect the connector (AB3) from airbag control module. 3) Connect connector (1R) in the test harness R to the body harness connector (AB3). 4) Measure resistance between the connector (2R) in the test harness R and chassis ground. Connector & terminal (2R) No. 10 — Chassis ground: (2R) No. 11 — Chassis ground:	Is the resistance less than 10 Ω?	Replace the airbag control module.	Repair the chassis ground circuit.
5.CHECK AIRBAG MAIN HARNESS AND BULKHEAD HARNESS. 1) Disconnect the connectors (5R) and (6R). 2) Remove the combination meter. 3) Measure the resistance between connector (i11) and connector (2R) in the test harness R. Connector & terminal (2R) No. 7 — (i11) No. 8:	Is the resistance less than 10 Ω?	Check the combination meter.
6.CHECK POOR CONTACT OF CONNECTORS (AB1) AND (B31). 1) Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 20 seconds or more. 2) Confirm that firm contact is secured between connectors (AB1) and (B31).	Is there poor contact in connectors (AB1) and (B31)?	Repair the bulkhead harness or replace the airbag main harness along with body harness.
7.CHECK AIRBAG MAIN HARNESS. Check the airbag main harness for abnormalities.	Is anything unusual to airbag main harness?	Replace the airbag main harness along with bulkhead harness.	Repair the bulkhead harness.