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

DTC U1300 CAN-LS MALFUNCTION

DTC DETECTING CONDITION:

Open or short in low speed CAN circuit

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 a 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) Turn the ignition switch to ON.

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

Is U1300 a current malfunction?

3.CHECK HARNESS.

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, check for open, short (power supply-output short, GND-output short) in the 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 (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):
(i84) No. 1 — (B419) No. 5 (gateway CM):
(i84) No. 9 — (B419) No. 4 (gateway CM):

Is harness normal?

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) Turn the ignition switch to ON.

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

Is U1300 a current malfunction?

Repair the navigation or audio.

5.CHECK A/C CONTROL PANEL.

1) Turn the ignition switch to OFF.

2) Connect the audio or navigation connectors.

3) Disconnect the A/C control panel connector (i88).

4) Turn the ignition switch to ON.

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

Is U1300 a current malfunction?

Replace the A/C control panel.

6.CHECK BODY INTEGRATED UNIT.

1) Turn the ignition switch to OFF.

2) Connect the A/C control panel.

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

4) Turn the ignition switch to ON.

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

Is U1300 a 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) Turn the ignition switch to ON.

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

Is U1300 a 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.