Anti-Lock Brake System (For Sedan) Abs Warning Light Remains On

Brake. Yaris. Ncp93, 131
Brake Control Dynamic Control Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT BATTERY

CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

CHECK DTC

CHECK CAN COMMUNICATION SYSTEM

PERFORM ACTIVE TEST USING TECHSTREAM (Indicat. Lamp ABS)

CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

CHECK HARNESS AND CONNECTOR (GND1, GND2 TERMINAL)

ANTI-LOCK BRAKE SYSTEM (for Sedan) - ABS Warning Light Remains ON


DESCRIPTION

The skid control ECU is connected to the combination meter via CAN communication.
If any of the following is detected, the ABS warning light remains on:
  1. The skid control ECU connectors are disconnected from the skid control ECU.
  2. There is a malfunction in the skid control ECU internal circuit.
  3. There is an open in the harness between the combination meter and the skid control ECU.
  4. The ABS control system is defective.
  5. The voltage at terminal IG1 is high.
HINT:
In some cases, an Techstream cannot be used when the skid control ECU is abnormal.

WIRING DIAGRAM


Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan).Anti-Lock Brake System (For Sedan) Abs Warning Light Remains On


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.INSPECT BATTERY

  1. Inspect the battery voltage.

    Standard Voltage:
    11 to 14 V


NG
CHECK OR REPLACE CHARGING SYSTEM OR BATTERY (YARIS_NCP93 RM000001E2J01FX.html)
OK


2.CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

  1. Check if the brake actuator assembly (skid control ECU) connector is securely connected.

    OK:
    The connector is securely connected.


NG
CONNECT CONNECTOR TO ECU CORRECTLY
OK


3.CHECK DTC

  1. Check for DTCs (YARIS_NCP93 RM000000XHV0BPX.html).

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


B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (YARIS_NCP93 RM000000XHU08CX.html)
A


4.CHECK CAN COMMUNICATION SYSTEM

  1. Check if CAN communication system DTCs are output (YARIS_NCP93 RM000001D3E00OX.html).

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


B
GO TO CAN COMMUNICATION SYSTEM (YARIS_NCP93 RM000001D3500JX.html)
A


5.PERFORM ACTIVE TEST USING TECHSTREAM (Indicat. Lamp ABS)

  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: Body Electrical / Combination Meter / Active Test.

  1. According to the display on the Techstream, perform the Active Test.

    Combination Meter
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Indicat. Lamp ABS
    		ABS warning light
    		OFF/ON
    		Perform the test with the vehicle stopped and the engine idling

  1. Check that the ABS warning light on the combination meter turns on or off in accordance with the tester operation.

    OK:
    The ABS warning light turns on or off in accordance with the tester operation.


NG
GO TO METER / GAUGE SYSTEM (YARIS_NCP93 RM000001DAG00QX.html)
OK


6.CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

  1. Turn the ignition switch off.

  1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.

  1. Disconnect the A15 brake actuator assembly (skid control ECU) connector.

  1. Check the connector case and terminals for deformation and corrosion.

    OK:
    No deformation or corrosion.


    Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan).Anti-Lock Brake System (For Sedan) Abs Warning Light Remains On

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A15-34 (IG1) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Brake Actuator Assembly (Skid Control ECU))


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


7.CHECK HARNESS AND CONNECTOR (GND1, GND2 TERMINAL)

  1. Turn the ignition switch off.



    Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan).Anti-Lock Brake System (For Sedan) Abs Warning Light Remains On

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A15-1 (GND1) - Body ground
    		Always
    		Below 1 Ω
    A15-13 (GND2) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Brake Actuator Assembly (Skid Control ECU))

  1. Reconnect the A15 brake actuator assembly (skid control ECU) connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1, GND2 CIRCUIT)
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02FX.html)