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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.  Is DTC of CAN communication displayed? Perform the diagnosis according to DTC. Go to step 2  .
2 CHECK FUSE (NO. 8). 
  1. Turn the ignition switch to OFF.
  2. Remove the fuse (No. 8).
 Is the fuse (No. 8) blown out? Replace the fuse (No. 8). If the new fuse (No. 8) has blown out easily, repair the short circuit of harness between fuse (No. 8) and stop light switch. Go to step 3  .
3 CHECK FUSE (RELAY BLOCK). 
Remove the fuse (7.5A) in the relay block.		 Is the fuse (7.5A) blown out? Replace the fuse (7.5A). If the replaced fuse (7.5A) blows out easily, repair the short circuit in the harness between the fuse (7.5A) and body integrated unit. Go to step 4  .
4 CHECK BODY INTEGRATED UNIT. 
  1. Turn the ignition switch to OFF.
  2. Connect the Subaru Select Monitor to data link connector.
  3. Turn the ignition switch to ON.
  4. Run the Subaru Select Monitor.
  5. Depress the brake pedal.
  6. Read the data of «Stop Light Switch» using Subaru Select Monitor. < Refer to READ CURRENT DATA . >
 Is "ON" displayed? Go to step 5  . Go to step 6  .
5 CHECK TCM. 
Read the data of «Stop Light Switch» using Subaru Select Monitor. < Refer to READ CURRENT DATA . >		 Is "ON" displayed? Check for poor contact in connectors or harnesses, and repair the defective part. Replace the TCM. < Refer to TRANSMISSION CONTROL MODULE (TCM) . >
6 CHECK BODY INTEGRATED UNIT INPUT SIGNAL. 
  1. Disconnect the connector from body integrated unit.
  2. Depress the brake pedal.
  3. Measure the voltage of harness between the body integrated unit and chassis ground.

    Connector & terminal 

    (B280) No. 2 (+) - Chassis ground (-): 

 Is the voltage 10 V or more? Go to step 9  . Go to step 7  .
7 CHECK HARNESS CONNECTOR BETWEEN BODY INTEGRATED UNIT AND STOP LIGHT SWITCH. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from stop light switch.
  3. Measure the resistance of harness between body integrated unit and stop light switch.

    Connector & terminal 

    (B280) No. 2 - (B65) No. 3: 

 Is the resistance less than 1 Ω? Go to step 8  . Repair the open circuit of harness between body integrated unit and stop light switch.
8 CHECK HARNESS CONNECTOR BETWEEN BODY INTEGRATED UNIT AND STOP LIGHT SWITCH. 
Measure the harness resistance between the body integrated unit and chassis ground.
Connector & terminal 
(B280) No. 2 - Chassis ground: 		 Is the resistance 1 MΩ or more? Go to step 9  . Repair the short circuit of harness between body integrated unit and stop light switch.
9 CHECK FOR POOR CONTACT.  Is there poor contact of input signal of brake switch? Repair the poor contact. Check body integrated unit.
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