VEHICLE STABILITY CONTROL SYSTEM ABS Warning Light Remains ON

DESCRIPTION

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 the skid control ECU.

• The ABS control system is defective.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC

   
   

   1. Turn the ignition switch to ON.

   2. Check if the DTC is recorded Click here.

      Result
      Result Proceed to DTC not output A DTC output B

   
   

   B

   REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 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 BATTERY

   
   

   1. Check the battery voltage.

      Standard voltage
      11 to 14 V

   
   

   NG

   CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

   OK

4. CHECK ABS WARNING LIGHT

   
   

   1. Turn the ignition switch to OFF and disconnect the skid control ECU connector.

   2. 

      Ground terminal WA of the skid control ECU.

   3. Turn the ignition switch to ON.

   4. Check the ABS warning light.

      OK
      WA- GND Condition Illumination Condition Connecting OFF Disconnecting ON

      Tech Tips

      
      

      • When the ABS warning light goes out, ground failure or open circuits in the brake actuator should be considered.

      • When the ABS warning light remains illuminated, opens in the wire harness among the combination meters or abnormalities in the meter circuit should be considered.

   
   

   NG

   CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER) Click here

   OK

5. INSPECT SKID CONTROL ECU (IG1 TERMINAL)

   
   

   1. 

      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 A41-28 (IG1) - Body ground Ignition switch ON 11 to 14 V

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

   OK

6. INSPECT SKID CONTROL ECU (GND TERMINAL)

   
   

   1. 

      Turn the ignition switch to OFF.

   2. 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 (GND CIRCUIT)

   OK

   REPLACE BRAKE ACTUATOR ASSEMBLY Click here

7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER)

   
   

   1. Turn the ignition switch to OFF.

   2. Disconnect the skid control ECU connector and the combination meter connector.

   3. 

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

      Standard resistance
      Tester Connection Condition Specified Condition A41-32 (WA) - A22-16 (LP) Always Below 1 Ω A41-32 (WA) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE COMBINATION METER ASSEMBLY Click here