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 (suspension control switch)*1 or turn assist function switch (integration control and panel assembly)*2 is on.

  *1: w/o Entry and Start System

  *2: w/ Entry and Start System

• 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

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK CAN COMMUNICATION LINE

   
   

   1. Turn the ignition switch off.

   2. Connect the GTS to the DLC3.

   3. Turn the ignition switch to ON 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 (with Central Gateway ECU))	B
      NG (for LHD (without Central Gateway ECU))	C
      NG (for RHD (with Central Gateway ECU))	D
      NG (for RHD (without Central Gateway ECU))	E

   
   

   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

   D

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

   E

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

   A

2. CHECK DTC (CAN COMMUNICATION SYSTEM)

   
   

   1. Turn the ignition switch off.

   2. Connect the GTS to the DLC3.

   3. Turn the ignition switch to ON and the GTS on.

   4. for LHD (with Central Gateway ECU):

      Check for DTCs Click here.

   5. for LHD (without Central Gateway ECU):

      Check for DTCs Click here.

   6. for RHD (with Central Gateway ECU):

      Check for DTCs Click here.

   7. for RHD (without Central Gateway ECU):

      Check for DTCs Click here.

      Result

      Result	Proceed to
      CAN DTC is not output	A
      CAN DTC is output (for LHD (with Central Gateway ECU))	B
      CAN DTC is output (for LHD (without Central Gateway ECU))	C
      CAN DTC is output (for RHD (with Central Gateway ECU))	D
      CAN DTC is output (for RHD (without Central Gateway ECU))	E

   
   

   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

   D

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

   E

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

   A

3. INSPECT SUSPENSION CONTROL SWITCH OR INTEGRATION CONTROL AND PANEL ASSEMBLY

   
   

   1. w/o Entry and Start System:

      Remove the turn assist function switch (suspension control switch) Click here.

   2. w/ Entry and Start System:

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

   3. w/o Entry and Start System:

      Inspect the turn assist function switch (suspension control switch) Click here.

   4. w/ Entry and Start System:

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

      Result

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

   
   

   B

   REPLACE SUSPENSION CONTROL SWITCH Click here

   C

   REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY Click here

   A

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

   
   

   1. Turn the ignition switch off.

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

   3. Disconnect the V4 turn assist function switch (suspension control switch)*1 or V8 turn assist function switch (integration control and panel assembly)*2 connector.

      
      

      • *1: w/o Entry and Start System

      • *2: w/ Entry and Start System

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

      Standard Resistance
      w/o Entry and Start System: Tester Connection Condition Specified Condition A24-29 (EXI4) - V4-2 (ECU) Always Below 1 Ω A24-29 (EXI4) - Body ground Always 10 kΩ or higher V4-16 (E) - Body ground Always Below 1 Ω
      w/ Entry and Start System: Tester Connection Condition Specified Condition A24-29 (EXI4) - V8-12 (ECU) Always Below 1 Ω A24-29 (EXI4) - Body ground Always 10 kΩ or higher V8-10 (E) - Body ground Always Below 1 Ω
      Result Result Proceed to OK (w/o Entry and Start System) A OK (w/ Entry and Start System) B NG C

   
   

   B

   CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU EXI4 CIRCUIT) Click here

   C

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   A

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

   
   

   1. Turn the ignition 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 [Suspension Control Switch])

      Disconnect the turn assist function switch (suspension control switch) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition V4-2 (ECU) - Body ground Ignition switch ON 11 to 14 V

   
   

   OK

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

   NG

   REPLACE MASTER CYLINDER SOLENOID Click here

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

   
   

   1. Turn the ignition 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 V8-12 (ECU) - Body ground Ignition switch ON 11 to 14 V

      Result

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

   
   

   A

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

   B

   REPLACE MASTER CYLINDER SOLENOID Click here

   C

   REPLACE MASTER CYLINDER SOLENOID Click here