ELECTRONICALLY CONTROLLED BRAKE SYSTEM ABS Warning Light Remains ON

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DESCRIPTION

The skid control ECU 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 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 assembly and the skid control ECU.

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INSPECTION PROCEDURE

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PROCEDURE

1. Click here

   INSPECT CAN COMMUNICATION SYSTEM

   
   

   1. for LHD:

      Check if the CAN communication system DTC is output (see pageClick here).

      for RHD:

      Check if the CAN communication system DTC is output (see pageClick here).

      Table 1. Result

      Result		Proceed to
      DTC is not output		A
      DTC is output	for LHD	B
      	for RHD	C

   
   
   • AClick here
   • BClick here
   • CClick here
2. Click here

   INSPECT IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

   
   

   1. Check the skid control ECU connector's connecting condition.

      OK
      The connector is securely connected.

   
   
   • OKClick here
   • NGClick here
3. Click here

   INSPECT BATTERY

   
   

   1. Check the battery voltage.

      Standard voltage
      11 to 14 V

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK TERMINAL VOLTAGE AND RESISTANCE (IG1, IG2, GND, GND4)

   
   
   1. 

      Disconnect the A19 and A21 ECU connectors.

   2. Turn the power switch ON (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition A19-46 (IG1) - A19-1 (GND) Power switch ON (IG) 11 to 14 V A21-46 (IG2) - A21-1 (GND4) Power switch ON (IG) 11 to 14 V

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

      Standard resistance
      Tester Connection Condition Specified Condition A19-1 (GND) - Body ground Always Below 1 Ω A21-1 (GND4) - Body ground Always Below 1 Ω

   
   
   • OKClick here
   • NGClick here
5. Click here

   INSPECT COMBINATION METER ASSEMBLY

   
   

   1. Perform the meter and gauge system active test (see pageClick here).

      Tip:

      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 (see pageClick here).

      Table 2. Result

      Result		Proceed to
      NG		A
      OK	for LHD	B
      	for RHD	C

   
   
   • AClick here
   • BClick here
   • CClick here
6. Click here

   REPLACE SKID CONTROL ECUClick here

7. Click here

   GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)Click here

8. Click here

   CONNECT CONNECTOR TO ECU CORRECTLY

9. Click here

   RECHARGE OR REPLACE BATTERYClick here

10. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

11. Click here

    REPLACE NO. 1 METER ECU SUB-ASSEMBLYClick here

12. Click here

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)Click here

13. Click here

    REPLACE SKID CONTROL ECUClick here