ANTI-LOCK BRAKE SYSTEM ABS Warning Light Remains ON

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DESCRIPTION

The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.

If any of the following is detected, the ABS warning light remains on:

• The skid control ECU (brake actuator assembly) connectors are disconnected from the skid control ECU (brake actuator assembly).

• There is a malfunction in the skid control ECU (brake actuator assembly) internal circuit.

• There is an open in the harness between the combination meter assembly and the skid control ECU (brake actuator assembly).

• The ABS control system is defective.

• w/ Rear Differential Lock:

  The rear differential is locked.

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CAUTION / NOTICE / HINT

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PROCEDURE

1. Click here

   CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check if CAN communication system DTCs are output.

      for LHD:Click here

      for RHD:Click here

      Result
      Proceed to DTC is not output DTC is output

   
   
   • DTC is not outputClick here
   • DTC is output

     CHECK CAN COMMUNICATION SYSTEM for LHD:Click here

     CHECK CAN COMMUNICATION SYSTEM for RHD:Click here

2. Click here

   CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED

   
   

   1. Check if the skid control ECU (brake actuator assembly) connector is securely connected.

      OK
      The connector is securely connected.

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY

3. Click here

   INSPECT BATTERY

   
   

   1. Check the battery voltage.

      Standard voltage
      11 to 14 V

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 1KD-FTV:Click here

     CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 1GD-FTV:Click here

     CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 2GD-FTV:Click here

     CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 2KD-FTV:Click here

     CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 1TR-FE:Click here

     CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 2TR-FE:Click here

     CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 5L-E:Click here

4. Click here

   CHECK TERMINAL VOLTAGE (IG1 TERMINAL)

   
   
   1. 

      *a	Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly])

      Disconnect the A3 skid control ECU (brake actuator assembly) 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 A3-34 (IG1) - Body ground Ignition switch ON 11 to 14 V

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

5. Click here

   CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

   
   

   1. Turn the ignition switch off.

   2. 

      *a	Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly])

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

      Standard Resistance
      Tester Connection Condition Specified Condition A3-1 (GND1) - Body ground Always Below 1 Ω

      Result
      Proceed to OK (w/o Rear Differential Lock) OK (w/ Rear Differential Lock) NG

   
   
   • OK (w/o Rear Differential Lock)Click here

     GO TO STEP 7

   • OK (w/ Rear Differential Lock)Click here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

6. Click here

   CHECK FOR DIFFERENTIAL SYSTEM

   
   

   1. Reconnect the A3 skid control ECU (brake actuator assembly) connector.

   2. Connect the GTS to the DLC3.

   3. Turn the ignition switch to ON.

   4. Turn the GTS on.

   5. Enter the following menus: Powertrain / Four Wheel Drive / Trouble Codes.

   6. Check for DTCs.

      
      
      1. Powertrain > Four Wheel Drive > Trouble Codes
      2. 
         
      3. 
         

      Result
      Proceed to DTCs are not output DTCs are output

   
   
   • DTCs are not outputClick here
   • DTCs are output

     GO TO DIFFERENTIAL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART)Click here

7. Click here

   READ VALUE USING GTS (ABS WARNING LIGHT)

   
   

   1. Reconnect the A3 skid control ECU (brake actuator assembly) connector.

   2. Connect the GTS to the DLC3.

   3. Turn the ignition switch to ON.

   4. Turn the GTS on.

   5. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

   6. According to the display on the GTS, read the Data List.

      
      
      1. Chassis > ABS/VSC/TRC > Data List

         Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
         ABS Warning Light	ABS warning light	OFF or ON	OFF: Warning light off ON: Warning light on	-

      2. 
         
         10. 
             
      
      
      1. Chassis > ABS/VSC/TRC > Data List

         Tester Display
         ABS Warning Light

      2. 
         
         1. 
            
      3. 
         
         10. 
             

   7. Check the GTS display condition of the ABS warning light.

      Result
      Proceed to Display of the Data List remains OFF Display of the Data List remains ON

   
   
   • Display of the Data List remains OFF

     INSPECT METER / GAUGE SYSTEMClick here

   • Display of the Data List remains ON

     REPLACE BRAKE ACTUATOR ASSEMBLYClick here