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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System (Auto Ac) (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC U0001 Can Communication Bus Off >> Trouble Symptom

DTC U0001 Can Communication Bus Off: Trouble Symptom

A/C does not operate fully automatically.

DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK DTC. 
Read the DTC of the CAN system using the Subaru Select Monitor.		 Is a DTC of the CAN system detected? Perform the diagnosis according to DTC. Go to step 2  .
2 CHECK A/C CM. 
  1. Replace with a normally operating A/C CM.
  2. Read the DTC using Subaru Select Monitor.
 Is U0001 detected? Go to step 3  . Replace the A/C CM. Refer to REMOVAL .
3 CHECK CAN COMMUNICATION CIRCUIT. 
Check the CAN communication circuit. Refer to LIST .		 Is the CAN communication circuit normal? It is possible that temporary poor communication occurs. Clear the memory. Repair or replace the CAN communication circuit.
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