VEHICLE STABILITY CONTROL SYSTEM Slip Indicator Light Remains ON

DESCRIPTION

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

The slip indicator light blinks during VSC or TRC/TRAC operation.

If any of the following is detected, the slip indicator light remains on:

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

• 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 VSC or TRC/TRAC control system is defective.

  Tech Tips

  In some cases, the GTS cannot be used when the skid control ECU (brake actuator assembly) is abnormal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK IF SKID CONTROL ECU CONNECTOR 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

   
   

   NG

   CONNECT CONNECTOR TO ECU CORRECTLY

   OK

2. 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 (for LHD) DTC is output (for RHD)

   
   

   DTC is output (for LHD)

   CHECK CAN COMMUNICATION SYSTEM Click here

   DTC is output (for RHD)

   CHECK CAN COMMUNICATION SYSTEM Click here

   DTC is not output

3. INSPECT BATTERY

   
   

   1. Check the battery voltage.

      Standard voltage
      11 to 14 V

      Result
      Proceed to OK NG (for 1AD-FTV) NG (for 2AD-FHV) NG (for 2AD-FTV) NG (for 2AR-FE) NG (for 3ZR-FAE) NG (for 3ZR-FE)

   
   

   NG (for 1AD-FTV)

   CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

   NG (for 2AD-FHV)

   CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

   NG (for 2AD-FTV)

   CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

   NG (for 2AR-FE)

   CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

   NG (for 3ZR-FAE)

   CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

   NG (for 3ZR-FE)

   CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

   OK

4. CHECK TERMINAL VOLTAGE (IG1 TERMINAL)

   
   
   1. 

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

      Disconnect the A64 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 A64-34 (IG1) - Body ground Ignition switch ON 11 to 14 V

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

   
   

   NG (w/o Stop and Start System)

   REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

   NG (w/ Stop and Start System)

   INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT)

   OK

5. 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 A64-1 (GND1) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

   OK

6. READ VALUE USING GTS (SLIP INDICATOR LIGHT)

   
   

   1. Reconnect the A64 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.

      
      Chassis > ABS/VSC/TRC > Data List

      Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
      Slip Indicator Light	SLIP indicator light	OFF or ON	OFF: Indicator light off ON: Indicator light on	-

      
      Chassis > ABS/VSC/TRC > Data List

      Tester Display
      Slip Indicator Light

   7. Check the GTS display condition of the slip indicator 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 SYSTEM Click here

   Display of the Data List remains ON

   REPLACE BRAKE ACTUATOR ASSEMBLY Click here