INSPECTION
Measure the battery voltage and check electrolyte.
Standard voltage
12 V
Specific gravity
1.260 or more
Fluid level
Between the upper level and lower level
TROUBLE SYMPTOM
Communication is impossible between the airbag control module and the Subaru Select Monitor.
Note. Refer to "COMMUNICATION FOR INITIALIZING IMPOSSIBLE" in AIRBAG SYSTEM (DIAGNOSTICS). < Ref. to COMMUNICATION FOR INITIALIZING IMPOSSIBLE , INSPECTION, Subaru Select Monitor. >
Communication is impossible between the airbag control module and the occupant detection control module. Perform the diagnosis from Step 2 in "DTC B1650 OCCUPANT CLASSIFICATION SYSTEM MALFUNCTION". < Ref. to DTC B1650 OCCUPANT CLASSIFICATION SYSTEM MALFUNCTION , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
Turn the ignition switch to ON, and confirm that the airbag warning light remains on for approx. 6 seconds and then goes off afterwards.
Scheme 186
Scheme 187
DTC DETECTING CONDITION
- Occupant detection sensor is faulty.
- Occupant detection control module is faulty.
- Occupant detection harness is faulty.
- Rear airbag harness is faulty.
| CAUTION | Before performing diagnosis, refer to "CAUTION" in "General Description". < Ref. to CAUTION , General Description. > |
- Passenger's buckle switch circuit is open, shorted or shorted to ground.
- Seat harness circuit is open, shorted or shorted to ground.
- Occupant detection control module is faulty.
- Occupant detection sensor circuit is open, shorted between terminals, shorted to power supply or shorted to ground.
- Seat heater circuit is open.
- Occupant detection control module is faulty.
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK POOR CONTACT OF CONNECTORS. Check for poor contact of connectors between the occupant detection control module and the occupant detection sensor. | Is there poor contact of connector? | Reconnect the connector. If the fault is not fixed, replace the occupant detection harness or replace the occupant detection system (passenger's side cushion & frame assembly). | Replace the occupant detection system (passenger's & frame assembly). < Ref. to PASSENGER'S SEAT , DISASSEMBLY, Front Seat. > |
DTC PROCEDURE
- Passenger's seat buckle switch is faulty.
- Passenger's buckle switch circuit is open, shorted or shorted to ground.
- Occupant detection system is faulty.
- Occupant detection harness is faulty.
Perform the diagnosis from step 2 in "DTC B1655 FRONT BUCKLE SWITCH RH FAILURE". < Ref. to DTC B1655 FRONT BUCKLE SWITCH RH FAILURE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
Occupant detection control module is faulty.
When "DTC B1795 ECU INTERNAL CIRCUIT FAULT" is displayed, the occupant detection control module is faulty. Replace the occupant detection system (passenger's side cushion & frame assembly). < Ref. to PASSENGER'S SEAT , DISASSEMBLY, Front Seat. >