TRAIL Switch Circuit [09/2023 - ]: Procedure

1. Using the GTS, check for DTCs.

   Refer to DIAGNOSIS SYSTEM [09/2023 - ]

2. Check that DTCs indicating a CAN communication system malfunction are not output.

   Result

   Result	Proceed to
   DTCs are not output.	A
   DTCs are output.	B

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

Result: 

A 

See step  2

1. Turn the ignition switch to ON.
2. Check that the TRAIL indicator illuminates and turns off in accordance with the operation of the TRAIL mode switch (electric parking brake switch assembly).

   OK

   The TRAIL indicator illuminates and turns off in accordance with the operation of the TRAIL mode switch.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

Result: 

NG 

See step  3

1. Read the Data List according to the display on the GTS.

   Chassis > Four Wheel Drive > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Trail Switch	TRAIL mode switch (electric parking brake switch assembly) condition	OFF / ON	ON: TRAIL mode switch (electric parking brake switch assembly) being pushed and held OFF: TRAIL mode switch (electric parking brake switch assembly) not operated	-

   Chassis > Four Wheel Drive > Data List 

   Tester Display
   Trail Switch

   OK

   The GTS display changes according to the TRAIL mode switch operation.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

CHECK METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - 12/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2023 - ] 

Result: 

NG 

See step  4

Refer to INSPECTION [09/2023 - ]

Result

Result: 

NG 

REPLACE TRAIL MODE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY). Refer to  REMOVAL [09/2023 - ] 

Result: 

OK 

See step  5

1. Disconnect the D22 TRAIL mode switch (electric parking brake switch assembly) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D22-7 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Disconnect the J7 4WD ECU assembly connector.
2. Disconnect the D22 TRAIL mode switch (electric parking brake switch assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J7-18 (OMS) - D22-5 (B)	Always	Below 1 Ω
   J7-18 (OMS) or D22-5 (B) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE 4WD ECU ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR