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Home >> Toyota >> 2005 >> Avalon XLS >> Repair and Diagnosis >> Brakes >> Traction Control >> Brakes - Abs With EBD & BA & TRAC & VSC (Diagnostics) >> Brake Warning Light Circuit (Remains On) >> Inspection Procedure

Inspection Procedure

NOTE: When replacing the ABS & TRACTION actuator assy, perform zero point calibration (see CALIBRATION  ).
  1. CHECK DTC 
    1. Check if the ABS and/or VSC DTC is output (see DTC CHECK/CLEAR  ).

    Result: 

    RESULT

    DTC is not output A
    DTC is output B
    1. B: REPAIR CIRCUIT INDICATED BY OUTPUT CODE (SEE  DIAGNOSTIC TROUBLE CODE CHART   ) 
    2. A: Go to next step. 
  2. INSPECT CAN COMMUNICATION SYSTEM 
    1. Check if the CAN communication system DTC is output (see DTC CHECK/CLEAR  ).

    Result: 

    RESULT

    DTC is not output A
    DTC is output B
    1. B: REPAIR CAN COMMUNICATION SYSTEM (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    2. A: Go to next step. 
  3. INSPECT MULTIPLEX COMMUNICATION SYSTEM 
    1. Check if the multiplex communication system DTC is output (see DTC CHECK/CLEAR ).

    Result: 

    RESULT

    DTC is not output A
    DTC is output B
    1. B: REPAIR MULTIPLEX COMMUNICATION SYSTEM (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    2. A: Go to next step. 
  4. INSPECT IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED 
    1. Check the skid control ECU connector's connecting condition.

      OK: 

      The connector should be securely connected. 

    1. NG: CONNECT CONNECTOR TO ECU CORRECTLY 
    2. OK: Go to next step. 
  5. INSPECT BATTERY 
    1. Check the battery voltage.

      Standard: 

      Voltage: 11 to 14 V 

    1. NG: INSPECT CHARGING SYSTEM (SEE  ON-VEHICLE INSPECTION  ) 
    2. OK: Go to next step. 
  6. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (IG1 TERMINAL VOLTAGE) 
    1. Disconnect the skid control ECU connector.
    2. Turn the ignition switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.
    Fig 1: Identifying Skid Control ECU Connector Terminal IG1
    G02976627Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - VOLTAGE

    Tester Connection Condition Specified Condition
    A34-46 (IG1) - Body ground Ignition switch on (IG) 10 to 14 V
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) 
    2. OK: Go to next step. 
  7. INSPECT SKID CONTROL ECU ASSY (GND TERMINAL CONTINUITY) 
    1. Disconnect the skid control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 2: Identifying Skid Control ECU Connector Terminals GND1 & GND2
    G02976628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

    Tester Connection Specified Condition
    A34-1 (GND2) - Body ground Below 1 Ω
    A34-32 (GND1) - Body ground Below 1 Ω
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) 
    2. OK: Go to next step. 
  8. INSPECT PARKING BRAKE SWITCH ASSY 
    1. Disconnect the parking brake switch connector.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 3: Identifying Parking Brake Switch Connector
    G02976629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

    Tester Connection Condition Specified Condition
    A22-1 - Body ground Parking brake switch ON (Switch pin free) Below 1 Ω
    A22-1 - Body ground Parking brake switch OFF (Switch pin pushed in) 10 kΩ or higher
    1. NG: REPLACE PARKING BRAKE SWITCH ASSY 
    2. OK: Go to next step. 
  9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO PARKING BRAKE SWITCH ASSY) (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
    1. Disconnect the skid control ECU connector and parking brake switch.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 4: Identifying Skid Control ECU Connector Terminal PKB & Parking Brake Switch Connector
    G02976630Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

    Tester Connection Specified Condition
    A34-28 (PKB) - A22-1 Below 1 Ω
    A34-28 (PKB) - Body ground 10 kΩ or higher
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (PKB CIRCUIT) 
    2. OK: Go to next step. 
  10. INSPECT BRAKE FLUID LEVEL WARNING SWITCH 
    1. Remove the reservoir tank cap and strainer.
    2. Disconnect the brake fluid level warning switch connector.
    3. Measure the resistance according to the value(s) in the table below.
    Fig 5: Identifying Brake Fluid Level Warning Switch Connector Terminals
    G02976631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

    Tester Connection Fluid Level Specified Condition
    (A17-1) - (A17-2) Proper 1.8 to 2.16 kΩ
    (A17-1) - (A17-2) Below min. level Below 1 Ω
    1. NG: REPLACE MASTER CYLINDER RESERVOIR SUB-ASSY (SEE  REPLACEMENT  ) 
    2. OK: Go to next step. 
  11. CHECK HARNESS AND CONNECTOR (BRAKE FLUID LEVEL WARNING SWITCH TO COMBINATION METER) (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
    1. Disconnect the combination meter connector.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 6: Identifying Combination Meter Connector Terminals E3-11 & Brake Fluid Level Warning Switch Connector
    G02976632Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

    Tester Connection Specified Condition
    E3-11 - A17-1 Below 1 Ω
    A17-2 - Body ground Below 1 Ω
    E3-11 - Body ground 10kΩ or higher
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (BRAKE FLUID LEVEL WARNING SWITCH CIRCUIT) 
    2. OK: Go to next step. 
  12. INSPECT COMBINATION METER ASSY 
    1. Check the combination meter assy (see HOW TO PROCEED WITH TROUBLESHOOTING ).
    1. NG: REPLACE COMBINATION METER ASSY (SEE  OVERHAUL  ) 
    2. OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE  REPLACEMENT  ) 

    HINT:

    If troubleshooting has been carried out according to the problem symptoms table, refer back to the table and proceed to the next step before replacing the part (see PROBLEM SYMPTOMS TABLE  ).

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