LAN SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC U1300 CAN-LS MALFUNCTION

DTC DETECTING CONDITION:

Either end of low-speed CAN communication line is open or the connector is not connected properly, or the terminal has poor crimping.

TROUBLE SYMPTOM:

Low speed CAN communication is not normal.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK DTC.

Read the DTC of body integrated unit using Subaru Select Monitor.

Is U1300 current malfunction?

2.CHECK DTC.

1) Disconnect all connectors (i84, i10, i88, i85 or i50, B419) that are connected to low speed CAN communication line.

2) Connect the disconnected connectors.

3) Read the DTC of body integrated unit using Subaru Select Monitor.

Is U1300 current malfunction?

3.CHECK DTC.

1) Turn the ignition switch to OFF.

2) Disconnect all connectors (i84, i10, i88, i85 or i50, B419) that are connected to low speed CAN communication line.

3) Using the tester, measure the resistance between terminals of harness.

Connector & terminal

(i84) No. 1 — (i10) No. 27 (combination meter):
(i84) No. 9 — (i10) No. 26 (combination meter):
(i84) No. 1 — (i88) No. 20 (auto A/C):
(i84) No. 9 — (i88) No. 19 (auto 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):
(i84) No. 1 — (B419) No. 5 (gateway CM):
(i84) No. 9 — (B419) No. 4 (gateway CM):

Is the resistance less than 10 Ω?

Repair or replace the harness.

4.CHECK AUDIO OR NAVIGATION.

1) Turn the ignition switch to OFF.

2) Connect the disconnected connectors.

3) Disconnect the connector of navigation (i85) or audio (i50).

4) Read the DTC of body integrated unit using Subaru Select Monitor.

Is U1300 current malfunction?

Repair the navigation or audio.

5.CHECK AUTO A/C ECM.

1) Turn the ignition switch to OFF.

2) Connect the audio or navigation connectors.

3) Disconnect the auto A/C ECM connector (i88).

4) Read the DTC of body integrated unit using Subaru Select Monitor.

Is U1300 current malfunction?

Replace the auto A/C control module.

6.CHECK BODY INTEGRATED UNIT.

1) Turn the ignition switch to OFF.

2) Connect the auto A/C control module.

3) Replace the body integrated unit of your vehicle with the body integrated unit from other vehicle, which is working normally.

4) Read the DTC of body integrated unit using Subaru Select Monitor.

Is U1300 current malfunction?

Replace the combination meter.

Replace the body integrated unit.

7.CHECK HARNESS.

1) Turn the ignition switch to OFF.

2) Shake the harness used for CAN communication circuit.

3) Read the DTC of body integrated unit using Subaru Select Monitor.

Is U1300 current malfunction?

Repair or replace the harness.

8.CHECK CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector that is connected to low speed CAN circuit.

Is there poor contact at disconnected connector?

Repair the connector terminal, or replace harness.

Temporary poor contact occurs.