DTC U1301 Can-LS Counter Abnormal: Wiring Diagram

CAN communication system. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: CAN Communication System - Wiring Diagram

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Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK DTC. Check CAN communication circuit. Refer to BUS "B" (SMART SYSTEM CAN) .	Is CAN communication circuit faulty?	Repair the faulty portion, following the diagnosis procedure.	Go to step 2 .
2 CHECK DTC. Start the engine. Using the Subaru Select Monitor, read DTC of CAN system.	Is U1302 a current malfunction?	Perform the diagnosis of U1302. Refer to DTC U1302 CAN-LS BUS OFF .	Go to step 3 .
3 CHECK DTC. Check DTC detected in step 2.	Is U1301 a current malfunction?	Go to step 4 .	It is possible that temporary poor communication occurs. Perform the clear memory.
4 CHECK DTC. Turn the ignition switch to ON. Using the Subaru Select Monitor, read DTC of CAN system.	Is U1301 a current malfunction?	Go to step 5 .	It is possible that temporary poor communication occurs. Perform the clear memory.
5 CHECK CONTROL MODULE. NOTE: For vehicles without remote engine start, go to next. Remove the remote engine start CM. Turn the ignition switch to ON. Using the Subaru Select Monitor, read DTC of CAN system.	Is U1301 a current malfunction?	Go to step 6 .	Check and replace the remote engine start CM.
6 CHECK DTC. Install a normal body integrated unit. Turn the ignition switch to ON. Using the Subaru Select Monitor, read DTC of CAN system.	Is U1301 a current malfunction?	Replace the keyless access CM.	Replace the body integrated unit. Refer to REMOVAL .