DTC B2785 Lin Communication Error: Wiring Diagram

NOTE: For the coupling connector, refer to "WIRING SYSTEM".
Keyless access with push button start system <Ref. to POWER DOOR LOCKS (Legacy), POWER DOOR LOCKS (Outback), Keyless Access With Push Button Start System.>

Fig 1: LIN Communication Error - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTICS PROCEDURE

Step	Check	Yes	No
1 CHECK DTC. Use the Subaru Select Monitor and read DTCs.	Is DTC B2785 displayed?	Go to step 2 .	Check the connector.
2 CHECK HARNESS. Disconnect the keyless access CM connector. Disconnect the steering lock CM connector. Disconnect the ID code box connector. (with ID code box) Using the tester, measure the resistance between terminals. Connector & terminal (i241) No. 13 - (i47) No. 5: (i241) No. 13 - (i33) No. 2: (with ID code box)	Is the resistance less than 1 Ω?	Go to step 3 .	Repair or replace the open circuit of harness.
3 CHECK HARNESS. (GROUND SHORT) Using the tester, measure the resistance between terminals. Connector & terminal (i241) No. 13 - Chassis ground: (i47) No. 5 - Chassis ground: (i33) No. 2 - Chassis ground: (with ID code box)	Is the resistance 10 kΩ or more?	Go to step 4 .	Repair or replace the short circuit of the harness.
4 CHECK HARNESS. Connect the keyless access CM connector only. Use the Subaru Select Monitor and read DTCs.	Is B2785 displayed?	Replace the keyless access CM. <Ref. to KEYLESS ACCESS CM .>	Go to step 5 .
5 CHECK ID CODE BOX. NOTE: For model without ID code box, go to the next step. Connect the ID code box. Use the Subaru Select Monitor and read DTCs. <Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .>	Is B2785 displayed?	Replace the ID code box. <Ref. to ID CODE BOX .>	Go to step 6 .
6 CHECK STEERING LOCK CM. Connect the steering lock CM. <Ref. to STEERING LOCK CM .> Using the Subaru Select Monitor, clear the memory. <Ref. to CLEAR MEMORY MODE .> Use the Subaru Select Monitor and read DTCs. <Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) .>	Is B2785 displayed?	Replace the steering lock CM. <Ref. to STEERING LOCK CM .>	Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.