VEHICLE STABILITY CONTROL SYSTEM > ABS Warning Light Remains ON

for Preparation Click here


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 intelligent tester cannot be used when the skid control ECU is abnormal.


WIRING DIAGRAM


C212080E01


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 CAN COMMUNICATION SYSTEM

  1. Check if CAN communication system DTCs are output (Click here).
    Result 
    Result
    		Proceed to
    DTC not output
    		A
    DTC output
    		B



B
CHECK CAN COMMUNICATION SYSTEM (Click here)
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 (Click here)
OK


4.INSPECT SKID CONTROL ECU (IG1 TERMINAL)

  1. Disconnect the A16 or A17 skid control ECU connector.

  1. Turn the ignition switch to ON.



    E175972E15

  1. Measure the voltage according to the value(s) in the table below.
    Text in Illustration 
    *A
    		for LHD
    *B
    		for RHD
    *1
    		Front view of wire harness connector
    (to Skid Control ECU)

    Standard Voltage:
    for LHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    A16-34 (IG1) - Body ground
    		Ignition switch ON
    		11 to 14 V
    for RHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    A17-34 (IG1) - Body ground
    		Ignition switch ON
    		11 to 14 V

Result 
Result
Proceed to
OK
A
NG (w/ Stop and Start System)
B
NG (w/o Stop and Start System)
C


B
GO TO STOP AND START SYSTEM (Click here)

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


5.INSPECT SKID CONTROL ECU (GND TERMINAL)

  1. Turn the ignition switch off.



    E175972E14

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *A
    		for LHD
    *B
    		for RHD
    *1
    		Front view of wire harness connector
    (to Skid Control ECU)

    Standard Resistance:
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    A16-1 (GND1) - Body ground
    		Always
    		Below 1 Ω
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    A17-1 (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 intelligent tester to the DLC3.

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

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



NG
Go to step 7
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)  

7.REPLACE COMBINATION METER ASSEMBLY

  1. Turn the ignition switch off.

  1. Replace the combination meter (Click here).


NEXT


8.INSPECT COMBINATION METER ASSEMBLY

  1. Connect the intelligent tester to the DLC3.

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

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



NG
REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)
OK

END