AWD Warning Light Remains ON: Procedure

1. Check if CAN communication system DTCs are output. Refer to DIAGNOSIS SYSTEM .
2. Check if the active torque control 4WD system DTC is output. Refer to DTC CHECK / CLEAR .
   RESULT
   
   

   Result	Proceed to
   Neither CAN communication system DTC nor active torque control 4WD system DTC is output	A
   CAN communication DTC is output	B
   Active torque control 4WD system DTC is output	C

   HINT: 

   When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

B → See step   7 

C → See step   8 

A: Go to next step 

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

   OK

   The connector is securely connected.

NG → CONNECT CONNECTOR TO ECU CORRECTLY 

OK: Go to next step 

1. Check the battery voltage.

   Standard voltage

   11 to 14 V

NG → See step   9 

OK: Go to next step 

1. Warm up the engine.
2. Turn the ignition switch off.
3. Connect the Techstream to the DLC3.
4. Turn the ignition switch to ON.
5. Turn the Techstream on.
6. Enter the following menus: Chassis / Four Wheel Drive / Active Test.
7. According to the display on the Techstream, perform the Active Test.
   FOUR WHEEL DRIVE
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   4WD Warning Light	AWD warning light	Warning light is ON/OFF	Observe combination meter

   OK

   The AWD warning light turns off.

NG → See step   5 

OK → See step   10 

1. Disconnect the ECU connector.
   Fig 1: Measuring Voltage Of 4WD Control ECU To Battery

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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
   K1-11 (IG1) - Body Ground	Ignition switch ON	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to 4WD Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 2: Measuring Resistance Of 4WD Control ECU To Body Ground

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K1-23 (GND) - Body Ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to 4WD Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   11