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OPERATION Subaru Impreza WRX GH

Airbag System (diagnostics) 2 illustrations ~165 words

OPERATION

For details about reading of DTCs, refer to " SUBARU SELECT MONITOR ". SUBARU SELECT MONITOR. >

Recreate the circumstance by referring to the conditions described in the checklist.

  1. Clear the memory in the following steps after the malfunction is repaired.
  2. For details concerning DTC clear operation, refer to " «SUBARU SELECT MONITOR»(/subaru/impreza-wrx/gh-2007-2010/remont/airbag/#airbag-system-diagnostics) ". SUBARU SELECT MONITOR. >

Turn the ignition switch to ON, and confirm that the airbag warning light remains on for approx. 6 seconds then turns off afterwards.

Scheme 178

Scheme 178: INSPECTION
Scheme 178: INSPECTION
  1. Airbag warning light is faulty.
  2. Airbag control module to airbag warning light circuit is shorted or open.
  3. Grounding circuit is faulty.
  4. Airbag control module is faulty.
  5. Connection of (AB1) and (B31) is improper.
  6. Connection of (AB6, AB17, and AB18) to airbag control module is improper.
CAUTIONBefore diagnosing the airbag system, be sure to turn the ignition switch to OFF, disconnect the ground cable from the battery, and wait 20 seconds or more before starting to work. When replacing the airbag module, 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 and seat belt pretensioner connector for safety reasons.

Scheme 179

Scheme 179: WIRING DIAGRAM
Scheme 179: WIRING DIAGRAM
StepCheckYesNo
1 READ DTC. Read the DTC. READ DIAGNOSTIC TROUBLE CODE (DTC), OPERATION, Subaru Select Monitor. >Is DTC displayed?Perform the diagnosis according to DTC.Go to step 2 .
2 CHECK POOR CONTACT. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 20 seconds or more. Confirm that the connectors of airbag control module (AB6, AB17, and AB18) are securely connected.Is there poor contact in connectors (AB6, AB17, and AB18) ?If the poor contact of the connector is not fixed, replace the airbag main harness along with body harness or replace the airbag control module. AIRBAG CONTROL MODULE . >Go to step 3 .
3 CHECK AIRBAG MAIN HARNESS. Remove the instrument panel lower cover and disconnect the connectors (AB7) and (AB2). Remove the instrument panel side cover on the passenger's side and disconnect the connectors (AB10) and (AB9). Disconnect the connectors (AB6, AB17, and AB18) from the airbag control module, and connect the connector (1 AG) in the test harness AG. Connect the battery ground terminal and turn the ignition switch to ON. Connect the connectors (7AG) and (8AG) in the test harness AG. NOTE: After the fault has been cleared, disconnect the connectors (7AG) and (8AG).Does the airbag warning light go off?Go to step 4.Go to step 5 .
4 CHECK GROUND CIRCUIT. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 20 seconds or more. Disconnect the connectors (AB6, AB17, and AB18) from airbag control module. Connect the connector (1 AG) in the test harness AG to the body harness connectors (AB6, AB17, and AB18). Measure the resistance between connector (2AG) in the test harness AG and chassis ground. Connector & terminal (2AG) No. 4 - Chassis ground: (2AG) No. 3 - Chassis groundIs the resistance less than 10 ohms?Replace the airbag control module. AIRBAG CONTROL MODULE . >Repair the chassis ground circuit.
5 CHECK AIRBAG MAIN HARNESS AND BULKHEAD HARNESS. Disconnect the connectors (7AG) and (8AG). Remove the combination meter. Measure the resistance between the combination meter connector and test harness AG connector (2AG). Connector & terminal (2AG) No. 5 - (i10) No. 36Is the resistance less than 10 ohms?Check the combination meter.Go to step 6 .
6 CHECK POOR CONTACT OF CONNECTORS (AB1)AND(B31). Turn the ignition switch to OFF, disconnect the battery ground terminal, and wait 20 seconds or more. Confirm that there is a firm contact 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.Go to step 7 .
7 CHECK AIRBAG MAIN HARNESS. Check the airbag main harness for defect.Is there any defect in the airbag main harness?Replace the airbag main harness along with bulkhead harness.Repair the bulkhead harness.
NOTE
After the fault has been cleared, disconnect the connectors (7AG) and (8AG).

DIAGNOSIS PROCEDURE

  1. Fuse No. 5 (in fuse box) is brown out.
  2. Body harness circuit is open.
  3. Airbag warning light is faulty.
  4. Airbag main harness is faulty.
  5. Airbag control module is faulty.
CAUTIONBefore 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, 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 and seat belt pretensioner connector for safety reasons.
StepCheckYesNo
1 CHECK COMBINATION METER. Turn the ignition switch to ON, and confirm that warning light of combination meter illuminates.Do warning lights except for air-bag illuminate?Go to step 2.Check the combination meter.
2 CHECK DTC. Read the DTC. READ DIAGNOSTIC TROUBLE CODE (DTC), OPERATION, Subaru Select Monitor. >Is DTC displayed?Perform the diagnosis according to DTC.Go to step 3 .
3 CHECK FUSE NO. 5 (IN MAIN FUSE BOX). Remove the fuse No. 5 and perform visual inspection.Is the fuse No. 5 (in main fuse box) blown out?Replace the fuse No. 5. If the fuse No. 5 is blown out again, go to step 4.Go to step 4 .
4 CHECK AIRBAG WARNING LIGHT CIRCUIT (IN COMBINATION METER). Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 20 seconds or more. Disconnect the connectors (AB1) and (B31). Connect the battery ground terminal and turn the ignition switch to ON.Does airbag warning light illuminate?Go to step 5.Check the combination meter.
5 CHECK AIRBAG MAIN HARNESS. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 20 seconds or more. Connect the connector (AB1) and (B31). Disconnect the connectors (AB6, AB17, and AB18) from airbag control module. Connect the battery ground terminal and turn the ignition switch to ON.Does airbag warning light illuminate?Replace the airbag control module. AIRBAG CONTROL MODULE . >Replace the airbag main harness along with bulkhead harness.

DIAGNOSIS PROCEDURE