Vehicle Stability Control System (W/O Vdim) Abs Warning Light Remains On

Brake. Lexus Is250, Is220D. Gse20 Ale20
Brake Control. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

CHECK MULTIPLEX COMMUNICATION SYSTEM

CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

CHECK BATTERY

INSPECT SKID CONTROL ECU (IG1 TERMINAL)

INSPECT SKID CONTROL ECU (GND TERMINAL)

INSPECT COMBINATION METER ASSEMBLY

VEHICLE STABILITY CONTROL SYSTEM (w/o VDIM) - ABS Warning Light Remains ON


DESCRIPTION

The skid control ECU is connected to the combination meter via CAN and multiplex communications.
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.
HINT:
In some cases, the intelligent tester cannot be used when the skid control ECU is abnormal.

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim).Vehicle Stability Control System (W/O Vdim) Abs Warning Light Remains On


INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (Click here).
1.CHECK CAN COMMUNICATION SYSTEM

  1. Check if the CAN communication system DTC is output (Click here for LHD, or Click here for RHD).

    Result:

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


B
INSPECT CAN COMMUNICATION SYSTEM
A


2.CHECK MULTIPLEX COMMUNICATION SYSTEM

  1. Check if the multiplex communication system DTC is output (Click here).

    Result:

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


B
INSPECT MULTIPLEX COMMUNICATION SYSTEM
A


3.CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

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

    OK:
    The connector should be securely connected.


NG
CONNECT CONNECTOR TO ECU CORRECTLY
OK


4.CHECK BATTERY

  1. Check the battery voltage.

    Standard voltage:
    11 to 14 V


NG
CHECK AND REPLACE CHARGING SYSTEM OR BATTERY
OK


5.INSPECT SKID CONTROL ECU (IG1 TERMINAL)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim).Vehicle Stability Control System (W/O Vdim) Abs Warning Light Remains On

  1. Disconnect the skid control ECU connector.

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A14-46 (IG1) - Body ground
    		Engine switch on (IG)
    		10 to 14 V


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


6.INSPECT SKID CONTROL ECU (GND TERMINAL)


    Lexus Is250, Is220D. Gse20 Ale20.Brake Control.Vehicle Stability Control System (W/ Vdim).Vehicle Stability Control System (W/O Vdim) Abs Warning Light Remains On

  1. Turn the engine switch off.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A14-32 (GND1) - Body ground
    		Always
    		Below 1 Ω
    A14-1 (GND2) - Body ground
    		Always
    		Below 1 Ω


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


7.INSPECT COMBINATION METER ASSEMBLY

  1. Reconnect the skid control ECU connector.

  1. Perform Active Test of the combination meter (meter CPU) using the intelligent tester (Click here).

    OK:
    The ABS warning light turns on or off in accordance with the intelligent tester.
    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 (Click here).


NG
REPLACE COMBINATION METER ASSEMBLY
OK

REPLACE BRAKE ACTUATOR ASSEMBLY