AWD Warning Remains ON [11/2018 - 10/2022]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Enter the following menus: Chassis / Four Wheel Drive / Utility / Vehicle Control History (RoB).
4. Using the Techstream, check for Vehicle Control History.

   Refer to VEHICLE CONTROL HISTORY [11/2018 - ] 

   Chassis > Four Wheel Drive > Utility 

   Tester Display
   Vehicle Control History (RoB)

   HINT: 

   If vehicle control history is stored when the dynamic torque vectoring 4WD/AWD system are suspended, the warning message is displayed.

   Result

   Result	Proceed to
   There is no vehicle control history for when the dynamic torque vectoring AWD system were suspended.	A
   There is vehicle control history for when the dynamic torque vectoring AWD system were suspended.	B

Result: 

B 

PERFORM TROUBLESHOOTING AND REPAIR REGARDING VEHICLE CONTROL HISTORY 

Refer to VEHICLE CONTROL HISTORY [11/2018 - ] 

Result: 

A 

See step  2

1. Check if the 4WD ECU assembly connector is securely connected.

   OK

   The connector is securely connected.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT CONNECTOR TO ECU CORRECTLY 

Result: 

OK 

See step  3

1. Turn the ignition switch off.
2. Disconnect the 4WD ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to 4WD ECU Assembly)

3. Turn the ignition switch to ON.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   N3-24 (IG1) - Body ground	Ignition switch ON	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Turn the ignition switch off.
2. Disconnect the N3 4WD ECU assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N3-1 (GND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Turn the ignition switch off.
2. Connect the Techstream the DLC3.
3. Turn the ignition switch to ON.
4. Turn the Techstream on.
5. Enter the following menus: Chassis / Four Wheel Drive / Data List.
6. According to the display on the Techstream, read the Data List.

   Chassis > Four Wheel Drive > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   4WD Warning Light	AWD warning (multi-information display)	OFF / ON	OFF: Warning off ON: Warning on	-

   Chassis > Four Wheel Drive > Data List 

   Tester Display
   4WD Warning Light

7. Check the Techstream display condition of the 4WD warning light.

   Result

   Proceed to
   Display of the Data List remains OFF
   Display of the Data List remains ON

Result: 

Display of the Data List remains OFF 

GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

Display of the Data List remains ON 

REPLACE 4WD ECU ASSEMBLY. Refer to  REMOVAL [11/2018 - ]