DTC U1301 Can-LS Counter Abnormal: Wiring Diagram

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: CAN-LS Wiring Diagram

G07666757

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE CHART

Step	Check	Yes	No
1 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor. < Ref. to OPERATION , Subaru Select Monitor. >	Are there DTC U1300 or U1302?	Perform the diagnosis according to DTC.	Go to step 2 .
2 CHECK DTC. Read the DTC of body integrated unit using Subaru Select Monitor.	Is U1301 a current malfunction?	Go to step 3.	Go to step 9 .
3 CHECK DTC. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.	Is U1301 a current malfunction?	Go to step 4.	Go to step 9 .
4 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. Using the tester, check for open, short (power supply-output short, GND-output short) harness. Connector & terminal (i84) No. 1 - (i10) No. 27 (combination meter): (i84) No. 9 - (i10) No. 26 (combination meter): (184) No. 1 - (i88) No. 20 (A/C): (i84) No. 9 - (i88) No. 19 (A/C): (i84) No. 1 - (i85) No. 12 (audio): (i84) No. 9 - (i85) No. 11 (audio): (i84) No. 1 - (i50) No. 18 (navigation): (i84) No. 9 - (i50) No. 6 (navigation):	Is harness normal?	Go to step 5.	Repair or replace the harness.
5 CHECK AUDIO OR NAVIGATION. Connect the disconnected connectors. Disconnect the connector of navigation (i50) or audio (i85). Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.	Is U1301 a current malfunction?	Go to step 6.	Replace the audio or navigation. < Ref. to REMOVAL , Audio. >
6 CHECK AUTO A/C CONTROL MODULE. Turn the ignition switch to OFF. Connect the audio or navigation module. Disconnect the auto A/C control module connector (i88). Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.	Is U1301 a current malfunction?	Go to step 7.	Replace the auto A/C control module. < Ref. to REMOVAL , Control Unit (Auto A/C Model). >
7 CHECK COMBINATION METER. Turn the ignition switch to OFF. Connect the disconnected connectors. Perform the self-diagnosis of combination meter. < Ref. to SELF-DIAGNOSIS , INSPECTION, Combination Meter System. >	Is the self-diagnosis of combination meter OK?	Go to step 8.	Replace the combination meter. < Ref. to REMOVAL , Combination Meter. >
8 CHECK BODY INTEGRATED UNIT. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line. Connect the disconnected connectors. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.	Is U1301 a current malfunction?	Replace the body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. >	Go to step 9 .
9 CHECK HARNESS. Turn the ignition switch to OFF. Shake the harness used for low speed CAN communication circuit. Turn the ignition switch to ON. Read the DTC of body integrated unit using Subaru Select Monitor.	Is U1301 a current malfunction?	Repair or replace the harness.	Go to step 10 .
10 CHECK CONNECTOR. Turn the ignition switch to OFF. Disconnect all connectors (i84, i10, i88, i85 or i50) that are connected to low speed CAN communication line.	Is there poor contact of connector terminal?	Repair the connector terminal, or replace harness.	Temporary poor contact occurs.