"CHK" message(s) are displayed on the SIGNAL CHECK screen. [10/2022 - ]: Procedure

1. Check which items display on the signal check screen.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result

   Result	Proceed to
   "CAMERA SW" displays "CHK" (red)	A
   "SHIFT" displays "CHK" (red)	B
   "CAN" displays "CHK" (red)	C

Result: 

B 

See step  4

Result: 

C 

GO TO CAN COMMUNICATION SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [02/2019 - ]

Result: 

A 

See step  2

1. Disconnect the N76 panoramic view monitor switch (trip switch) connector.
2. Disconnect the G37 parking assist ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G37-5 (D) - N76-15 (BLSW)	Always	Below 1 Ω
   G37-2 (E) - Body ground	Always	Below 1 Ω
   G37-5 (D) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Refer to INSPECTION [11/2018 - ]

Result

Result: 

OK 

REPLACE PARKING ASSIST ECU 

Refer to REMOVAL [10/2022 - ]

Result: 

NG 

REPLACE PANORAMIC VIEW MONITOR SWITCH (TRIP SWITCH) 

Refer to REMOVAL [11/2018 - ]

1. Check that the back-up light comes on.

   OK

   The back-up light comes on.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO LIGHTING SYSTEM (EXT) 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2021 - 10/2023] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - 11/2024] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2024 - ]

Result: 

OK 

See step  5

1. Disconnect the parking assist ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   N76-7 (REV) - Body ground	Ignition switch ON, shift lever in R	11 to 14 V
   N76-7 (REV) - Body ground	Ignition switch ON, shift lever not in R	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE PARKING ASSIST ECU 

Refer to REMOVAL [10/2022 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR