AWD Control Switch Circuit [09/2017 - ]: Procedure

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Chassis / Four Wheel Drive / Active Test
6. According to the display on the Techstream, perform the 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

7. When performing the 4WD LOCK Light Active Test, check 4WD LOCK 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 ON: AWD lock mode indicator light on	-

   Chassis > Four Wheel Drive > Active Test 

   Active Test Display
   4WD LOCK Light

   Data List Display
   4WD LOCK Light

   Result

   Proceed to
   Changes between ON and OFF
   Does not change between ON and OFF

Result: 

Does not change between ON and OFF 

REPLACE 4WD ECU ASSEMBLY. Refer to  REMOVAL [10/2014 - 05/2019]  , or refer to  REMOVAL [05/2019 - ] 

Result: 

Changes between ON and OFF 

See step  2

1. Turn the engine switch off.
2. Remove the AWD lock mode switch (No. 2 combination switch assembly).

   Refer to REMOVAL [10/2014 - ]

3. Inspect the AWD lock mode switch (No. 2 combination switch assembly).

   Refer to INSPECTION [09/2017 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 2 COMBINATION SWITCH ASSEMBLY. Refer to  REMOVAL [10/2014 - ] 

Result: 

OK 

See step  3

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I37-18 (GND) - Body ground	Always	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to AWD Lock Mode Switch (No. 2 Combination Switch Assembly))

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Reinstall the AWD lock mode switch (No. 2 combination switch assembly).

   Refer to INSTALLATION [10/2014 - ]

2. Disconnect the I55 4WD ECU assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   I55-10 (4WDS) - Body ground	Switch pressed and held	Below 1 Ω
   	Switch released	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: 

OK 

REPLACE 4WD ECU ASSEMBLY. Refer to  REMOVAL [10/2014 - 05/2019]  , or refer to  REMOVAL [05/2019 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR