VEHICLE STABILITY CONTROL SYSTEM Turn Assist Indicator Light Circuit

DESCRIPTION

When any of the following conditions are met, the turn assist system becomes operable and the turn assist indicator light illuminates.

• Crawl Control is operating.

• The turn assist function switch (integration control and panel assembly) is on.

• The center differential is "free".

• The vehicle is moving at a speed of 10 km/h (6 mph) or less.

• The shift lever is not in P, R or N.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION LINE

   
   

   1. Turn the engine switch off.

   2. Connect the GTS to the DLC3.

   3. Turn the engine switch on (IG) and the GTS on.

   4. Select "CAN Bus Check" from the System Selection Menu screen, and follow the prompts on the screen to inspect the CAN Bus.

      OK
      "CAN Bus Check" indicates no malfunctions in CAN communication.

      Result

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

   
   

   B

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

   C

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

   A

2. CHECK DTC (CAN COMMUNICATION SYSTEM)

   
   

   1. Turn the engine switch off.

   2. Connect the GTS to the DLC3.

   3. Turn the engine switch on (IG) and the GTS on.

   4. Check for DTCs (for LHD: Click here, for RHD: Click here.

      Result

      Result	Proceed to
      CAN system DTC is not output	A
      CAN system DTC is output (for LHD)	B
      CAN system DTC is output (for RHD)	C

   
   

   B

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

   C

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

   A

3. INSPECT TURN ASSIST FUNCTION SWITCH

   
   

   1. Remove the turn assist function switch (integration control and panel assembly) Click here.

   2. Inspect the turn assist function switch (integration control and panel assembly) Click here.

   
   

   NG

   REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY Click here

   OK

4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - TURN ASSIST FUNCTION SWITCH)

   
   

   1. Turn the engine switch off.

   2. Disconnect the A24 skid control ECU (master cylinder solenoid) connector.

   3. Disconnect the V4 turn assist function switch (integration control and panel assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A24-29 (EXI4) - V4-12 (OTA) Always Below 1 Ω A24-29 (EXI4) - Body ground Always 10 kΩ or higher V4-8 (E) - Body ground Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU EXI4 CIRCUIT)

   
   

   1. Turn the engine switch off.

   2. Connect the skid control ECU (master cylinder solenoid) connector.

   3. 

      *a	Front view of wire harness connector (to Turn Assist Function Switch [Integration Control and Panel Assembly])

      Disconnect the turn assist function switch (integration control and panel assembly) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition V4-12 (OTA) - Body ground Engine switch on (IG) 11 to 14 V

      Result

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

   
   

   B

   REPLACE MASTER CYLINDER SOLENOID Click here

   C

   REPLACE MASTER CYLINDER SOLENOID Click here

   A

   GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here