4WD Control Switch Circuit [09/2015 - ]: Procedure

1. Confirm the problem symptoms.
   RESULT
   
   

   Result	Proceed to
   The 4LO indicator light remains off after operating the transfer position switch (integration control and panel assembly) to L4	A
   The 4LO indicator light remains on after operating the transfer position switch (integration control and panel assembly) to H4	B

Result: 

B 

See step  8

Result: 

A 

See step  2

HINT: 

Perform the following procedure with the vehicle stopped.

1. Turn the engine switch on (IG).
2. Move the shift lever to N.
3. Turn the transfer position switch (integration control and panel assembly) to L4.
4. Check the 4LO indicator light.
   RESULT
   
   

   Result	Proceed to
   The 4LO indicator light remains off	A
   The 4LO indicator light is blinking or illuminated	B

   1. Blinking: Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)

Result: 

B 

END 

Result: 

A 

See step  3

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 [09/2015 - 08/2017] Refer to DIAGNOSIS SYSTEM [08/2017 - 08/2019] Refer to DIAGNOSIS SYSTEM [08/2019 - ] .

   OK

   "Bus Check" indicates no malfunctions in CAN communication.

   RESULT
   
   

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

Result: 

B 

CHECK CAN COMMUNICATION SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - 08/2020] Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2020 - ] )

Result: 

A 

See step  4

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the Techstream on.
4. Turn the engine switch on (IG).
5. Enter the following menus: Powertrain / Four Wheel Drive / Data List.
6. According to the display on the Techstream, read the Data List.
   FOUR WHEEL DRIVE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Transfer Position Control SW	Transfer position switch (integration control and panel assembly) status/ ON or OFF	ON: L4 OFF: H4	-

   OK

   Display changes according to transfer position switch (integration control and panel assembly) operation.

Result: 

NG 

See step  6

Result: 

OK 

See step  5

1. Turn the engine switch off.
2. Perform an Active Test of the combination meter assembly using the Techstream. Refer to DATA LIST / ACTIVE TEST [09/2015 - 08/2017] Refer to DATA LIST / ACTIVE TEST [08/2017 - ] .
3. Check the combination meter assembly.

   OK

   The 4LO indicator light turns on or off in accordance with the Techstream.

Result: 

OK 

REPLACE 4 WHEEL DRIVE CONTROL ECU 

Refer to REMOVAL [09/2015 - ] )

Result: 

NG 

CHECK METER / GAUGE SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - ] )

1. Remove the transfer position switch (integration control and panel assembly). Refer to REMOVAL [09/2015 - ] .
2. Inspect the transfer position switch (integration control and panel assembly). Refer to INSPECTION [09/2015 - ] .

   OK

   The transfer position switch (integration control and panel assembly) operates normally.

Result: 

NG 

REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY 

Refer to REMOVAL [09/2015 - ] )

Result: 

OK 

See step  7

1. Disconnect the A27 4 wheel drive control ECU connector.
2. Disconnect the V9 transfer position switch (integration control and panel assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A27-13 (LO) - V12-21 (2WD)	Always	Below 1 Ω
   A27-13 (LO) or V12-21 (2WD)- Body ground	Always	10 kΩ or higher
   V12-1 (E) - Body ground	Always	Below 1 Ω

Result: 

OK 

REPLACE 4 WHEEL DRIVE CONTROL ECU 

Refer to REMOVAL [09/2015 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

HINT: 

Perform the following procedure with the vehicle stopped.

1. Turn the engine switch on (IG).
2. Move the shift lever to N.
3. Turn the transfer position switch (integration control and panel assembly) to H4.
4. Check the 4LO indicator light.
   RESULT
   
   

   Result	Proceed to
   The 4LO indicator light remains illuminated	A
   The 4LO indicator light is blinking or illuminated	B

   1. Blinking: Blinks at 0.5 second intervals (0.5 seconds on and 0.5 seconds off)

Result: 

B 

END 

Result: 

A 

See step  9

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 [09/2015 - 08/2017] Refer to DIAGNOSIS SYSTEM [08/2017 - 08/2019] Refer to DIAGNOSIS SYSTEM [08/2019 - ] .

   OK

   "Bus Check" indicates no malfunctions in CAN communication.

   RESULT
   
   

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

Result: 

B 

CHECK CAN COMMUNICATION SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - 08/2020] Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2020 - ] )

Result: 

A 

See step  10

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the Techstream on.
4. Turn the engine switch on (IG).
5. Enter the following menus: Powertrain / Four Wheel Drive / Data List.
6. According to the display on the Techstream, read the Data List.
   FOUR WHEEL DRIVE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   L4 Indicator Request	4LO indicator light request/ Blink3, Blink1, ON, OFF	Blink3: Indicator light rapidly blinks Blink1: Indicator light blinks ON: Indicator light illuminates OFF: Indicator light turns off	Blinking: 0.5 second intervals (0.5 seconds on and 0.5 seconds off) Rapidly blinking: 0.25 second intervals (0.25 seconds on and 0.25 seconds off)

   1. Operate the transfer position switch (integration control and panel assembly) several times between H4 and L4, and then check the Techstream display condition of the 4LO indicator light.

      Result

      Result	Proceed to
      Data List continues to display ON even when transfer position switch (integration control and panel assembly) is operated	A
      Data List display changes according to transfer position switch (integration control and panel assembly) operation	B

Result: 

A 

REPLACE 4 WHEEL DRIVE CONTROL ECU 

Refer to REMOVAL [09/2015 - ] )

Result: 

B 

CHECK METER / GAUGE SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - ] )