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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 38 (Vehicle Dynamics Control (VDC) System (Diagnostics)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC C0054 BLS Off 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 STOP LIGHT SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the stop light switch connector.
  3. Measure the resistance of stop light switch terminals.

    Connector & terminal 

    (B65) No. 2 - (B65) No. 3: 

 Is the resistance 1 Ω or less when the switch is ON (when pedal is depressed)? Go to step 2  . Replace the stop light switch. < Refer to STOP LIGHT SWITCH . >
2 CHECK STOP LIGHT POWER SUPPLY. 
Measure the voltage between stop light switch terminal and chassis ground.
Connector & terminal 
(B65) No. 2 (+) - Chassis ground (-): 		 Is the voltage 10 - 15 V? Go to step 3  . Repair the stop light power supply circuit.
3 CHECK STOP LIGHT SWITCH HARNESS. 
  1. Disconnect the connector from the VDCCM&H/U.
  2. Measure the resistance between VDCCM&H/U and stop light switch.

    Connector & terminal 

    (B65) No. 3 - (B310) No. 30: 

 Is the resistance less than 1 Ω? Go to step 4  . Repair the stop light switch circuit.
4 CHECK POOR CONTACT OF CONNECTORS.  Is there poor contact of connector between stop light switch and VDCCM&H/U? Repair the connector. Go to step 5  .
5 CHECK VDCCM&H/U. 
  1. Connect all connectors.
  2. Clear the memory. < Refer to CLEAR MEMORY MODE . >
  3. Perform the Inspection Mode. < Refer to INSPECTION MODE . >
  4. Read the DTC.
 Is the same DTC displayed? Replace the VDCCM only. < Refer to REPLACEMENT , VDC Control Module and Hydraulic Control Unit (VDCCM&H/U). > Go to step 6  .
6 CHECK OTHER DTC DETECTION.  Is any other DTC displayed? Perform the diagnosis according to DTC. < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > Temporary poor contact occurs.
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