DTC B1797: Occupant Detection Sensor Supplier Id And Function Id Mismatch

DTC detecting condition:

Detected when an occupant detection sensor of a different manufacturer or for a different vehicle manufacturer is mounted.

NOTE: This DTC is detected when a non-genuine occupant detection sensor is mounted. Replace with a genuine passenger's seat. Ref. to SEATS>FRONT SEAT .

Failure detection pattern:

"Primary" (high-priority diagnosis)

Warning light/indicator light:

Airbag warning light◦

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to AIRBAG (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

CHECK BATTERY .
Check the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>BATTERY>INSPECTION .

Is the check result OK?

Yes: GO TO 2.

No: Charge or replace the battery. And then, GO TO 2.
CHECK AIRBAG CONTROL MODULE .
1. Using the Subaru Select Monitor, perform the clear memory of [Airbag]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .
2. Execute the inspection mode. Ref. to AIRBAG (DIAGNOSTICS)>INSPECTION MODE .
3. Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC B1797 displayed? (Current code)

Yes: GO TO 3.

No: GO TO 4.
CHECK OCCUPANT DETECTION SENSOR .
Check the serial ID on the side face of the occupant detection sensor.

Courtesy of SUBARU OF AMERICA, INC.

(1) Serial ID

Are the last two digits EC or FC?

Yes: Replace the airbag control module. And then, GO TO 4.

No: Replace the passenger's seat together with the occupant detection sensor. And then, GO TO 4.
CHECK FOR ANY OTHER DTC ON DISPLAY .
Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is any other DTC displayed? (Current code)

Yes: Perform the diagnosis for the displayed DTCs. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

No: Finish the diagnosis.