DTC 2C Belt Tension Sensor Failure: Wiring Diagram

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Occupant Detection System < Refer to Occupant Detection System wiring diagram. >

Fig 1: Belt Tension Sensor Failure - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK POOR CONTACT OF CONNECTORS. Check for poor contact of the connectors between the occupant detection control module and belt tension sensor.	Is there poor contact?	Reconnect the connector. If the fault is not fixed, replace the airbag harness.	Go to step 2 .
2 CHECK BELT TENSION SENSOR. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more. Disconnect the belt tension sensor connector (AB56) from the airbag harness. Connect the test harness AC to the connector (AB56). Connect the battery ground terminal and turn the ignition switch to ON.	Does the airbag warning light illuminate for approximately 6 seconds and go off?	Replace the seat belt outer. < Refer to OUTER SEAT BELT ASSEMBLY , REMOVAL, Front Seat Belt. >	Go to step 3 .
3 CHECK AIRBAG HARNESS. Turn the ignition switch to OFF, disconnect the battery ground cable, and wait for 60 seconds or more. Disconnect the test harness AC from the belt tension sensor connector (AB56). Connect the test harness AD (1AD) to the connector (AB56). Disconnect the airbag harness connector (AB53), and connect connector (1AB) of test harness AB. Measure the resistance between test harness terminals. Connector & terminal (2AB) No. 5 - (2AD) No. 1: (2AB) No. 4 - (2AD) No. 3: (2AB) No. 6 - (2AD) No. 2:	Is the resistance less than 10 Ω?	Go to step 4 .	Replace the airbag harness along with chassis harness.
4 CHECK AIRBAG HARNESS. Measure the resistance between test harness terminals, and between test harness terminal and chassis ground. Connector & terminal (2AB) No. 4 - (2AD) No. 1: (2AB) No. 4 - (2AD) No. 2: (2AB) No. 4 - chassis ground: (2AB) No. 5 - (2AD) No. 2: (2AB) No. 5 - chassis ground:	Is the resistance 1 MΩ or more?	Go to step 5 .	Replace the airbag harness along with chassis harness.
5 CHECK AIRBAG HARNESS. Connect the battery ground terminal and turn the ignition switch to ON. Measure the voltage between test harness and chassis ground. Connector & terminal (2AD) No. 1 (+) - Chassis ground (-): (2AD) No. 3 (+) - Chassis ground (-):	Is the voltage 1 V or less?	Replace the airbag harness along with chassis harness.	Check the seat harness, and if any fault is found, replace the seat harness. If no fault is found in the seat harness, replace the seat cushion frame assembly. < Refer to PASSENGER'S SEAT , DISASSEMBLY, Front Seat. >