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

1. Confirm the problem symptoms.

   Result

   Result	Proceed to
   The 4WD indicator light and 4LO indicator light remain off	A
   The 4WD indicator light remains illuminated, and the 4LO indicator light remains off	B
   The 4WD 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 H4.
4. Wait for 60 seconds.
5. Check the 4WD indicator light.

   Result

   Result	Proceed to
   The 4WD indicator light blinks*1 or illuminates	A
   The 4WD 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 L4.
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

   Proceed to
   OK
   NG

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
   F91-1 (2-4) - Body ground	Ignition switch ON H2 position	Below 1.5 V
   	Ignition switch ON H4 position	Below 1.5 V
   	Ignition switch ON L4 position	10 to 14 V
   F91-5 (LO) - Body ground	Ignition switch ON H2 position	10 to 14 V
   	Ignition switch ON H4 position	Below 1.5 V
   	Ignition switch ON L4 position	Below 1.5 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

REPLACE TRANSFER POSITION SWITCH. Refer to  REMOVAL [08/2019 - ] 

1. Turn the ignition switch to ON.
2. Move the shift lever to N.
3. Turn the transfer position switch to H2.
4. Wait for 60 seconds.
5. Check the 4WD indicator light.

   Result

   Result	Proceed to
   The 4WD indicator light blinks*1 or turns off	A
   The 4WD 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 H4.
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 H2.
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  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
   F91-1 (2-4) - Body ground	Ignition switch ON H2 position	Below 1.5 V
   	Ignition switch ON H4 position	Below 1.5 V
   	Ignition switch ON L4 position	10 to 14 V
   F91-5 (LO) - Body ground	Ignition switch ON H2 position	10 to 14 V
   	Ignition switch ON H4 position	Below 1.5 V
   	Ignition switch ON L4 position	Below 1.5 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

REPLACE TRANSFER POSITION SWITCH. Refer to  REMOVAL [08/2019 - ]