ANTI-LOCK BRAKE SYSTEM 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:

• The skid control ECU connectors are disconnected from the skid control ECU.

• There is a malfunction in the skid control ECU internal circuit.

• There is an open in the harness between the combination meter and skid control ECU.

• The ABS control system is defective.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check if a CAN communication system DTC is output Click here.

      Result

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

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) 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. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

   
   
   1. 

      Text in Illustration

      *1	Front view of wire harness connector (to Skid Control ECU)

      Disconnect the skid control ECU connector.

   2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition A41-18 (IG1) - Body ground Ignition switch ON 11 to 14 V

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   
   1. 

      Text in Illustration

      *1	Front view of wire harness connector (to Skid Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition A41-4 (GND1) - Body ground Always Below 1 Ω A41-1 (GND2) - Body ground Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

5. INSPECT COMBINATION METER

   
   

   1. Perform the Active Test of the combination meter to check the ABS warning light using the intelligent tester Click here.

      OK
      The ABS warning light blinks or turns off in accordance with the intelligent tester operation.

      Tech Tips

      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 Click here

   OK

   REPLACE BRAKE ACTUATOR ASSEMBLY Click here