4WD Control Switch Circuit [08/2019 - ]: Procedure

1. Confirm the problem symptoms.
   RESULT
   
   

   Result	Proceed to
   The center differential lock indicator light and 4LO indicator light remain off	A
   The center differential lock indicator light remains illuminated, and the 4LO indicator light remains off	B
   The center differential lock indicator light) and 4LO indicator light remain illuminated	C

Result: 

B 

See step  6

Result: 

C 

See step  7

Result: 

A 

See step  2

1. Turn the ignition switch to ON.
2. Move the shift lever to N.
3. Turn the transfer position switch to H4L.
4. Wait for 60 seconds.
5. Check the center differential lock indicator light.
   RESULT
   
   

   Result	Proceed to
   The center differential lock indicator light blinks*1 or illuminates	A
   The center differential lock indicator light rapidly blinks*2 or remains off	B

   • *1 (Blinking): Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)
   • *2 (Rapidly blinking): Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)

Result: 

A 

END 

Result: 

B 

See step  3

1. Turn the transfer position switch to L4L.
2. Check if DTC P279E is output after 60 seconds elapse.

   Refer to DTC CHECK / CLEAR [08/2019 - ]

   RESULT
   
   

   Result	Proceed to
   DTC P279E is not output	A
   DTC P279E is output	B

Result: 

B 

GO TO DTC P279E. Refer to  DTC P279E: Four Wheel Drive (4WD) Range Signal Circuit Range / Performance [08/2019 - ]  

Result: 

A 

See step  4

1. Select "Bus Check" from the System Selection Menu screen, and follow the prompts on the screen to inspect the CAN bus.

   Refer to DIAGNOSIS SYSTEM [08/2019 - 08/2021] , or refer to DIAGNOSIS SYSTEM [08/2021 - 08/2022] , or refer to DIAGNOSIS SYSTEM [08/2022 - ]

   OK

   "Bus Check" indicates no malfunctions in CAN communication.

Result: 

NG 

CHECK CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ] 

Result: 

OK 

See step  5

1. Remove the transfer position switch with its connector still connected.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Transfer Position Switch)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   F73-1 (HI) - Body ground	Ignition switch ON H4F position	Below 1.5 V
   	Ignition switch ON H4L position	Below 1.5 V
   	Ignition switch ON L4L position	10.5 to 14 V
   F73-5 (LO) - Body ground	Ignition switch ON H4F position	10.5 to 14 V
   	Ignition switch ON H4L position	Below 1.5 V
   	Ignition switch ON L4L position	Below 1.5 V

Result: 

OK 

CHECK METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - ] 

Result: 

NG 

REPLACE TRANSFER POSITION SWITCH. Refer to  REMOVAL [08/2015 - ] 

1. Turn the ignition switch to ON.
2. Move the shift lever to N.
3. Turn the transfer position switch to H4F.
4. Wait for 60 seconds.
5. Check the center differential lock indicator light.
   RESULT
   
   

   Result	Proceed to
   The center differential lock indicator light blinks*1 or turns off	A
   The center differential lock indicator light rapidly blinks*2 or remains on	B

   • *1 (Blinking): Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)
   • *2 (Rapidly blinking): Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)

Result: 

A 

END 

Result: 

B 

GO TO DTC P279E. Refer to  DTC P279E: Four Wheel Drive (4WD) Range Signal Circuit Range / Performance [08/2019 - ]  

HINT: 

Perform the following procedures with the vehicle stopped.

1. Turn the ignition switch to ON.
2. Move the shift lever to N.
3. Turn the transfer position switch to H4L.
4. Wait for 60 seconds.
5. Check the 4LO indicator light.
   RESULT
   
   

   Result	Proceed to
   The 4LO indicator light blinks*1 or turns off	A
   The 4LO indicator light rapidly blinks*2 or remains on	B

   • *1 (Blinking): Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)
   • *2 (Rapidly blinking): Blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)

Result: 

A 

END 

Result: 

B 

See step  8

1. Turn the transfer position switch to H4F.
2. Check if DTC P279E is output after 60 seconds elapse.
   RESULT
   
   

   Result	Proceed to
   DTC P279E is not output	A
   DTC P279E is output	B

Result: 

B 

GO TO DTC P279E. Refer to  DTC P279E: Four Wheel Drive (4WD) Range Signal Circuit Range / Performance [08/2019 - ]  

Result: 

A 

See step  9

1. Remove the transfer position switch with its connector still connected.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Transfer Position Switch)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   F73-1 (HI) - Body ground	Ignition switch ON H4F position	Below 1.5 V
   	Ignition switch ON H4L position	Below 1.5 V
   	Ignition switch ON L4L position	10.5 to 14 V
   F73-5 (LO) - Body ground	Ignition switch ON H4F position	10.5 to 14 V
   	Ignition switch ON H4L position	Below 1.5 V
   	Ignition switch ON L4L position	Below 1.5 V

Result: 

OK 

CHECK CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ] 

Result: 

NG 

REPLACE TRANSFER POSITION SWITCH. Refer to  REMOVAL [08/2015 - ]