DTC B1650 Occupant Classification System Malfunction: Wiring Diagram

Occupant Detection System. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Occupant Detection System - Wiring Diagram

G06653250

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK DTC. Read diagnostic trouble code (DTC) for the airbag system.	Is another DTC detected?	Perform the diagnosis according to DTC.	Go to step 2 .
2 CHECK POOR CONTACT OF CONNECTORS. Check for poor contact of the connectors between the occupant detection control module and airbag control module.	Is there poor contact?	Reconnect the connector. If defective is not improved, replace the airbag rear harness along with the body harness or the occupant detection harness (seat harness).	Go to step 3 .
3 CHECK AIRBAG REAR HARNESS. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more. Disconnect the connectors (AB6, AB17, AB18) from airbag control module. Disconnect the connectors (AB59) and (AB53) under the passenger's seat. Connect the connector (1AG) in the test harness AG to the connectors (AB6, AB17, AB18). NOTE: For sedan models, connect test harness AH between the connectors (AB6, AB17, AB18) and (1AG). Connect the connector (1AD) in the test harness AD to the connector (AB53). Measure the resistance between connector (6AG) or (5AG) in the test harness AG and connector (2AD) in the test harness AD. Connector & terminal Sedan model (5AG) No. 3 - (2AD) No. 2: (5AG) No. 8 - (2AD) No. 3: OUTBACK model (6AG) No. 10 - (2AD) No. 3: (6AG) No. 12 - (2AD) No. 2:	Is the resistance less than 10 Ω?	Go to step 4 .	Replace the airbag rear harness along with body harness.
4 CHECK AIRBAG REAR HARNESS. Measure the resistance between connector (2AD) in the test harness AD and chassis ground, and between connector (2AD) terminals. Connector & terminal (2AD) No. 2 - chassis ground: (2AD) No. 3 - chassis ground: (2AD) No. 2 - (2AD) No. 3:	Is the resistance 1 MΩ or more?	Go to step 5 .	Replace the airbag rear harness along with body harness.
5 CHECK OCCUPANT DETECTION HARNESS. Turn the ignition switch to ON. Measure the voltage between connector (2AD) in the test harness AD and chassis ground. Connector & terminal (2AD) No. 1 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Replace the occupant detection harness (seat harness). If defective is not improved, replace the occupant detection system (seat cushion & frame assembly), and then the airbag control module in this order. Refer to PASSENGER'S SEAT .	Check the battery voltage and fuse. If there is no fault, replace the airbag rear harness together with body harness.