ELECTRONICALLY CONTROLLED BRAKE SYSTEM Brake Warning Light Remains ON

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DESCRIPTION

The skid control ECU assembly is connected to the combination meter assembly via CAN communication.

If any of the following is detected, the brake warning light / red (malfunction) remains on:

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

• The brake fluid level is insufficient.

• EBD operation has been disabled.

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CAUTION / NOTICE / HINT

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PROCEDURE

1. Click here

   CHECK DTC

   
   

   1. Check if ABS, VSC and/or electronically controlled brake system DTCs are output.

      Click here

      
      
      1. Chassis > ABS/VSC/TRC > Trouble Codes
      2. 
         
      3. 
         

      Result
      Result Proceed to DTCs are not output. A DTCs are output. B

   
   
   • AClick here
   • B

     REPAIR CIRCUITS INDICATED BY OUTPUT DTCSClick here

2. Click here

   CHECK CAN COMMUNICATION SYSTEM

   
   

   1. Check if CAN communication system DTCs are output.

      Click here

      Result
      Result Proceed to DTCs are not output. A DTCs are output. B

   
   
   • AClick here
   • B

     INSPECT CAN COMMUNICATION SYSTEMClick here

3. Click here

   CHECK IF SKID CONTROL ECU ASSEMBLY CONNECTOR IS SECURELY CONNECTED

   
   

   1. Check if the skid control ECU assembly connector is securely connected.

      OK
      The connector is securely connected.

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     CONNECT CONNECTOR TO SKID CONTROL ECU ASSEMBLY CORRECTLY

4. Click here

   CHECK AUXILIARY BATTERY

   
   

   1. Check the auxiliary battery voltage.

      Standard Voltage
      Tester Connection Condition Specified Condition Auxiliary battery Power switch on (IG) 11 to 14 V Auxiliary battery Power switch on (READY) 11 to 15.5 V

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     CHARGE OR REPLACE AUXILIARY BATTERY

5. Click here

   CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)

   
   

   1. Disconnect the A11 skid control ECU assembly connector.

   2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition A11-2 (IG1) - Body ground Power switch on (IG) 11 to 14 V

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

6. Click here

   CHECK HARNESS AND CONNECTOR (GND TERMINAL)

   
   

   1. Turn the power switch off.

   2. Disconnect the A13, A10 and A12 skid control ECU assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A10-1 (GND) - Body ground Always Below 1 Ω A11-3 (GND2) - Body ground Always Below 1 Ω A11-1 (GND3) - Body ground Always Below 1 Ω A12-3 (GND4) - Body ground Always Below 1 Ω A12-1 (GND5) - Body ground Always Below 1 Ω A13-3 (GND6) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

7. Click here

   READ VALUE USING GTS (BRAKE WARNING LIGHT / RED (MALFUNCTION))

   
   

   1. Reconnect the A11, A13, A10 and A12 skid control ECU assembly connectors.

   2. Connect the GTS to the DLC3.

   3. Turn the power switch on (IG).

   4. Select the Data List on the GTS.

      Click here

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

         Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
         Brake Warning Light	Brake warning light / red (malfunction)	ON or OFF	ON: Warning light on OFF: Warning light off	-

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

         Tester Display
         Brake Warning Light

      2. 
         
         1. 
            
      3. 
         
         10. 
             

   5. Check the GTS display condition of the brake warning light / red (malfunction).

      Result
      Result Proceed to OFF is displayed A ON is displayed B

   
   
   • A

     INSPECT METER / GAUGE SYSTEMClick here

   • B

     REPLACE SKID CONTROL ECU ASSEMBLY for LHD:Click here

     REPLACE SKID CONTROL ECU ASSEMBLY for RHD:Click here