Vehicle Stability Control 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

CHECK CAN COMMUNICATION SYSTEM

CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

INSPECT BATTERY

INSPECT SKID CONTROL ECU (IG1 TERMINAL)

INSPECT SKID CONTROL ECU (GND TERMINAL)

INSPECT COMBINATION METER ASSEMBLY

REPLACE COMBINATION METER ASSEMBLY

INSPECT COMBINATION METER ASSEMBLY

VEHICLE STABILITY CONTROL 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.
HINT:
In some cases, the 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).Vehicle Stability Control System (For Sedan) Abs Warning Light Remains On


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform zero point calibration (YARIS_NCP93 RM000000XHR06QX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.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
CHECK CAN COMMUNICATION SYSTEM (YARIS_NCP93 RM000001D3500JX.html)
A


2.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


3.INSPECT BATTERY

  1. Check the battery voltage.

    Standard voltage:
    11 to 14 V


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


4.INSPECT SKID CONTROL ECU (IG1 TERMINAL)

  1. Disconnect the A30 skid control ECU connector.

  1. Turn the ignition switch to ON.



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

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

    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Skid Control ECU)
    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A30-34 (IG1) - Body ground
    		Ignition switch ON
    		11 to 14 V


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


5.INSPECT SKID CONTROL ECU (GND TERMINAL)

  1. Turn the ignition switch off.



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

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

    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Skid Control ECU)
    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A30-1 (GND1) - Body ground
    		Always
    		Below 1 Ω


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


6.INSPECT COMBINATION METER ASSEMBLY

  1. Reconnect the skid control ECU connector.

  1. Connect the Techstream to the DLC3.

  1. Perform Active Test of the combination meter using the Techstream (YARIS_NCP93 RM000001DAT00FX.html).

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


NG
Go to step 7
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02FX.html)

7.REPLACE COMBINATION METER ASSEMBLY

  1. Turn the ignition switch off.

  1. Replace the combination meter (YARIS_NCP93 RM000000IN001JX.html).


NEXT


8.INSPECT COMBINATION METER ASSEMBLY

  1. Connect the Techstream to the DLC3.

  1. Perform Active Test of the combination meter using the Techstream (YARIS_NCP93 RM000001DAT00FX.html).

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


NG
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02FX.html)
OK

END