Brake Warning Light Does Not Go Off: Wiring diagram

Parking brake/brake fluid level warning light system Ref. to WIRING SYSTEM>Parking Brake/Brake Fluid Level Warning Light System .

Fig 1: Brake Fluid Level Warning Light System Wiring Diagram (Brake Warning Light OFF)

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK INSTALLATION OF VDCCM&H/U CONNECTOR. 
   1. Turn the ignition switch to OFF.
   2. Check that the VDCCM&H/U connector is inserted until it is locked by clamp.

   Is the connector firmly inserted?

   • Yes  : Go to 2. 
   • No  : Insert the VDCCM&H/U connector until it is locked by clamp.
2. READ DTC. 

   Read the DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

   Is DTC displayed?

   • Yes  : Perform the diagnosis according to DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>List of Diagnostic Trouble Code (DTC) .
   • No  : Go to 3. 
3. CHECK LAN SYSTEM. 

   Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure .

   Is there any fault in LAN system?

   • Yes  : Perform the diagnosis according to DTC for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>List of Diagnostic Trouble Code (DTC) .
   • No  : Go to 4. 
4. CHECK BRAKE FLUID AMOUNT. 

   Check the amount of brake fluid in the reservoir tank of master cylinder.

   Does the level of the brake fluid amount fall between the lines of "MAX" and "MIN"?

   • Yes  : Go to 5. 
   • No  : Replenish brake fluid to the specified value.
5. CHECK BRAKE FLUID LEVEL SWITCH. 
   1. Turn the ignition switch to OFF.
   2. Disconnect the level switch connector (B16) from master cylinder.
   3. Measure the resistance of master cylinder terminals.

      Terminals 

      No. 1 -No. 2:

   Is the resistance 1 MΩ or more?

   • Yes  : Go to 6. 
   • No  : Replace the master cylinder. Ref. to BRAKE>Master Cylinder .
6. CHECK GROUND SHORT OF HARNESS. 
   1. Disconnect the connector (i10) from combination meter.
   2. Measure the resistance between combination meter connector and chassis ground.

      Connector & terminal 

      (i10) No. 23 - Chassis ground:

   Is the resistance 1 MΩ or more?

   • Yes  : Go to 7. 
   • No  : Repair the harness between combination meter and brake fluid level switch.
7. CHECK PARKING BRAKE SWITCH. 
   1. Disconnect the connector (R4) from parking brake switch.
   2. Release the parking brake.
   3. Measure the resistance between parking brake switch terminal and chassis ground.

   Is the resistance 1 MΩ or more?

   • Yes  : Go to 8. 
   • No  : Replace the parking brake switch.
8. CHECK GROUND SHORT OF HARNESS. 
   1. Disconnect the connector (i84) from body integrated unit.
   2. Measure the resistance between body integrated unit connector and chassis ground.

      Connector & terminal 

      (i84) No. 32 - Chassis ground:

   Is the resistance 1 MΩ or more?

   • Yes  : Go to 9. 
   • No  : Repair the harness between body integrated unit and parking brake switch.
9. CHECK POOR CONTACT OF CONNECTOR. 

   Check for poor contact of all connectors.

   Is there poor contact?

   • Yes  : Repair the connector.
   • No  : Go to 10. 
10. CHECK COMBINATION METER. 

    Check the combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION>SELF-DIAGNOSIS DISPLAY MODE .

    Is the check result OK?

    • Yes  : Replace the VDCCM only. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>REPLACEMENT .
    • No  : Replace the combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>Combination Meter .