AWD Control Switch Circuit [12/2013 - ]: Procedure

1. Turn the ignition switch off.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
4. Turn the Techstream on.
5. Enter the following menus: Chassis / Four Wheel Drive / Active Test

   Chassis > Four Wheel Drive > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   4WD LOCK Light	AWD lock mode indicator light	Indicator light OFF/ON	Observe combination meter assembly

   Chassis > Four Wheel Drive > Active Test 

   Tester Display
   4WD LOCK Light

6. When performing the 4WD Warning Light Active Test, check 4WD Warning Light in the Data List.

   Chassis > Four Wheel Drive > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   4WD LOCK Light	AWD lock mode indicator light	OFF or ON	OFF: AWD lock mode indicator light off OFF: AWD lock mode indicator light on	-

   Chassis > Four Wheel Drive > Data List 

   Tester Display
   4WD LOCK Light

   Result

   Result	Proceed to
   Changes between ON and OFF	A
   Does not change between ON and OFF	B

Result:  2

B 

REPLACE 4WD ECU ASSEMBLY. Refer to  COMPONENTS [12/2013 - ] 

Result:  1

A 

See step  2

1. Remove the AWD lock switch (differential lock switch).

   Refer to REMOVAL [12/2013 - ]

2. Inspect the AWD lock switch (differential lock switch).

   Refer to INSPECTION [12/2013 - ]

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPLACE DIFFERENTIAL LOCK SWITCH. Refer to  COMPONENTS [12/2013 - ] 

Result:  1

OK 

See step  3

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F56-6 (GND) - Body ground	Always	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to AWD Lock Switch (Differential Lock Switch))

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  1

OK 

See step  4

1. Reinstall the AWD lock switch (differential lock switch).

   Refer to INSTALLATION [12/2013 - ]

2. Disconnect the F14 4WD ECU assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F14-10 (4WDL) - Body ground	AWD lock switch on	Below 1 Ω
   	AWD lock switch off	10 kΩ or higher

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

REPLACE 4WD ECU ASSEMBLY. Refer to  COMPONENTS [12/2013 - ] 

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR