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) connector is 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 anti-lock brake system is defective.

• The voltage at terminal IG1 is high.

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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 (Click here).

      Table 1. Result

      Result	Proceed to
      DTC not output	A
      DTC output	B

   
   
   • AClick here
   • B

     GO TO CAN COMMUNICATION SYSTEM (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.

   
   
   • OKClick here
   • NG

     CONNECT CONNECTOR TO ECU CORRECTLY

3. Click here

   CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

   
   
   1. 

      Make sure that there is no looseness in the locking part and connecting part of the connector.

   2. Disconnect the skid control ECU (brake actuator assembly) connector.

   3. Turn the ignition switch to ON.

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

      Standard Voltage (for LHD with CVT, and RHD)
      Tester Connection Switch Condition Specified Condition A78-20 (IG1) - Body ground Ignition switch ON 11 to 14 V

      Standard Voltage (for LHD except CVT)
      Tester Connection Switch Condition Specified Condition A79-20 (IG1) - Body ground Ignition switch ON 11 to 14 V

      Table 2. Text in Illustration

      *A	for LHD with CVT, and RHD
      *B	for LHD except CVT
      *a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

   5. Turn the ignition switch off.

      Table 3. Result

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

   
   
   • AClick here
   • B

     REPAIR OR REPLACE HARNESS OR CONNECTOR

   • C

     GO TO STOP AND START SYSTEM (Click here)

4. Click here

   CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

   
   
   1. 

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

      Standard Resistance (for LHD with CVT, and RHD)
      Tester Connection Condition Specified Condition A78-13 (GND1) - Body ground Always Below 1 Ω

      Standard Resistance (for LHD except CVT)
      Tester Connection Condition Specified Condition A79-13 (GND1) - Body ground Always Below 1 Ω

      Table 4. Text in Illustration

      *A	for LHD with CVT, and RHD
      *B	for LHD except CVT
      *a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

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

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

5. Click here

   READ VALUE USING INTELLIGENT TESTER (ABS WARNING LIGHT)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the tester on.

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

   5. According to the display on the tester, read the Data List.

      Table 5. ABS/VSC/TRC

      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	-

   6. When performing the ABS Warning Light Active Test, check ABS Warning Light in the Data List.

      Table 6. ABS/VSC/TRC

      Tester Display	Test Part	Control Range	Diagnostic Note
      ABS Warning Light	ABS warning light	Warning light ON/OFF	Observe the combination meter.

      Table 7. Result

      Result		Proceed to
      Data List Display	Data List Display when Performing Active Test ON/OFF Operation
      ON	Changes between ON and OFF	A
      	Does not change between ON and OFF (for LHD)	B
      	Does not change between ON and OFF (for RHD)	C
      OFF	Changes between ON and OFF	A
      	Does not change between ON and OFF (for LHD)	B
      	Does not change between ON and OFF (for RHD)	C

   
   
   • A

     GO TO METER / GAUGE SYSTEM (Click here)

   • B

     REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)

   • C

     REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)