VEHICLE STABILITY CONTROL SYSTEM (for Hatchback) > Brake Warning Light Remains ON


DESCRIPTION

The skid control ECU (brake actuator assembly) is connected to the combination meter via CAN communication.
If any of the following is detected, the brake warning light remains on:
  1. The skid control ECU (brake actuator assembly) connector is disconnected from the skid control ECU (brake actuator assembly).
  2. The brake fluid level is insufficient.
  3. The parking brake is applied.
  4. EBD operation is not possible.

WIRING DIAGRAM


C243295E03


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform zero point calibration (Click here).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

  1. Check if the skid control ECU connector is securely connected.

    OK:
    The connector is securely connected.


NG
CONNECT CONNECTOR TO ECU CORRECTLY
OK


2.CHECK CAN COMMUNICATION SYSTEM

  1. Check if CAN communication system DTCs are output (Click here).

Result 
Result
Proceed to
DTC is not output
A
DTC is output
B


B
CHECK CAN COMMUNICATION SYSTEM (Click here)
A


3.INSPECT BATTERY

  1. Check the battery voltage.

    Standard voltage:
    11 to 14 V


NG
CHECK AND REPLACE CHARGING SYSTEM OR BATTERY (Click here)
OK


4.CHECK TERMINAL VOLTAGE (IG1 TERMINAL)

  1. Disconnect the skid control ECU (brake actuator assembly) connector.

  1. Turn the ignition switch to ON.



    C243286E12

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A70-34 (IG1) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Skid control ECU)

  1. Turn the ignition switch off.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK


5.CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)


    C243286E13

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A70-1 (GND1) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Skid control ECU)

  1. Reconnect the skid control ECU (brake actuator assembly) connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)
OK


6.READ VALUE USING TECHSTREAM (PARKING BRAKE SWITCH)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

  1. According to the display on the Techstream, read the Data List.

    ABS/VSC/TRAC 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Parking Brake SW
    		Parking brake switch/OFF or ON
    		OFF: Parking brake released
    ON: Parking brake applied
    		-

  1. Using the Techstream, check the input of the switch operation when the parking brake pedal is operated.

    OK:
    When the parking brake is operated, the display changes as shown above.


NG
Go to step 12
OK


7.INSPECT BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY (BRAKE FLUID LEVEL WARNING SWITCH)


    C235854E01

  1. Turn the ignition switch off.

  1. Remove the reservoir filler cap and strainer.

  1. Disconnect the brake fluid level warning switch connector.

  1. Measure the resistance according to the value(s) in the table below.

    HINT:
    A float is located inside the reservoir. Its position can be changed by increasing or decreasing the level of brake fluid.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    1 - 2
    		Switch off (Float up)
    		10 kΩ or higher
    Switch on (Float down)
    		Below 1 Ω

    HINT:
    If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.
Text in Illustration 
*a
Component without harness connected
(Brake Fluid Level Warning Switch)

  1. Reconnect the brake fluid level warning switch connector.

  1. Reinstall the reservoir filler cap and strainer.



NG
REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY (Click here)
OK


8.CHECK HARNESS AND CONNECTOR (COMBINATION METER - BRAKE FLUID LEVEL WARNING SWITCH)

  1. Disconnect the combination meter assembly connector and the brake fluid level warning switch.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D100-12 (SW) - A62-1 (+)
    		Always
    		Below 1 Ω
    A62-2 (E) - Body ground
    		Always
    		Below 1 Ω
    D100-12 (SW) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the combination meter assembly connector and the brake fluid level warning switch.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.READ VALUE USING TECHSTREAM (BRAKE WARNING LIGHT)

  1. Turn the ignition switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

  1. According to the display on the Techstream, read the Data List.

    ABS/VSC/TRAC 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Brake Warning Light
    		Brake warning light/OFF or ON
    		OFF: Warning light OFF
    ON: Warning light ON
    		-

  1. When performing the Brake Warning Light Active Test, check Brake Warning Light in the Data List.


ABS/VSC/TRAC 
Tester Display
Test Part
Control Range
Diagnostic Note
Brake Warning Light
Brake warning light
Warning light OFF/ON
Observe combination meter
[Vehicle condition]
Vehicle stopped

Result 
Result
Proceed to
Data List Display
Data List Display when Performing Active Test ON/OFF Operation
ON
Changes between ON and OFF
A
Does not change between ON and OFF
B
OFF
Changes between ON and OFF
A
Does not change between ON and OFF
B

  1. Connect the Techstream to the DLC3.



B
REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)
A


10.REPLACE COMBINATION METER ASSEMBLY

  1. Turn the ignition switch off.

  1. Replace the combination meter assembly (Click here).


NEXT


11.CHECK COMBINATION METER ASSEMBLY

  1. Connect the Techstream to the DLC3.

  1. Perform Active Test of the combination meter assembly using the Techstream (Click here).

    OK:
    The brake warning light turns ON or OFF in accordance with the Techstream.


NG
REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)
OK

END 

12.INSPECT PARKING BRAKE SWITCH ASSEMBLY

  1. Remove the parking brake switch assembly (Click here).

  1. Inspect the parking brake switch assembly (Click here).



NG
REPLACE PARKING BRAKE SWITCH ASSEMBLY (Click here)
OK


13.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - PARKING BRAKE SWITCH)

  1. Disconnect the instrument panel junction block assembly connector and the parking brake switch assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3A-28 (PKB) - D116-1
    		Always
    		Below 1 Ω
    3A-28 (PKB) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the instrument panel junction block assembly connector and the parking brake switch assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


14.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

  1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

  1. Disconnect the instrument panel junction block assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3A-28 -12 (PKB)
    		Always
    		Below 1 Ω
    3A-28 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the instrument panel junction block assembly connector.

  1. Reinstall the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)