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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (LAN Communication System (Diagnostics)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC U1300 Can-LS Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK DTC. 
Read the DTC of body integrated unit using Subaru Select Monitor.< Refer to OPERATION , Subaru Select Monitor. >		 Is U1300 a current malfunction? Go to step 2  . Go to step 7  .
2 CHECK DTC. 
  1. Disconnect all connectors (i84, i10, i88, i85 or i50) 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? Go to step 3  . Go to step 7  .
3 CHECK HARNESS. 
  1. Turn the ignition switch to OFF.
  2. Disconnect all connectors (i84, i10, i88, i85 or i50) 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): 

 Is harness normal? Go to step 4  . Repair or replace the harness.
4 CHECK AUDIO OR NAVIGATION. 
  1. Connect the disconnected connectors.
  2. Disconnect the connector of navigation (i50) or audio (i85).
  3. Turn the ignition switch to ON.
  4. Read the DTC of body integrated unit using Subaru Select Monitor.
 Is U1300 a current malfunction? Go to step 5  . Replace the navigation or audio.< Refer to REMOVAL , Audio. >
5 CHECK AUTO A/C CONTROL MODULE. 
  1. Turn the ignition switch to OFF.
  2. Connect the audio or navigation connectors.
  3. Disconnect the auto A/C control module 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? Go to step 6  . Replace the auto A/C control module.< Refer to REMOVAL , Control Unit (Auto A/C Model). >
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. 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.< Refer to REMOVAL , Combination Meter. > Replace the body integrated unit.< Refer to REMOVAL , 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. Go to step 8  .
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 communication failure occurs.
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