"CHK" message(s) are displayed on the SIGNAL CHECK screen. [10/2017 - 10/2020]: 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 [10/2017 - 09/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020] 

Result: 

A 

See step  2

1. Disconnect the G5 panoramic view monitor main switch (Integration control and panel assembly) connector.
2. Disconnect the G96 parking assist ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G96-15 (BLSW) - G5-5 (D)	Always	Below 1 Ω
   G5-17 (E) - Body ground	Always	Below 1 Ω
   G96-15 (BLSW) - 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

1. Remove the panoramic view monitor main switch (Integration control and panel assembly).

   Refer to REMOVAL [10/2017 - ]

2. Inspect the panoramic view monitor main switch (Integration control and panel assembly).

   Refer to INSPECTION [10/2017 - 10/2020]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE PARKING ASSIST ECU. Refer to  REMOVAL [10/2017 - 10/2020] 

Result: 

NG 

REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY (PANORAMIC VIEW MONITOR MAIN SWITCH). Refer to  REMOVAL [10/2017 - ] 

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 [10/2017 - 09/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020] 

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
   G96-14 (REV) - Body ground	Power swtich on (READY) Shift position in R	8 V or higher
   G96-14 (REV) - Body ground	Power swtich on (READY) Shift position not in R	Below 3 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE PARKING ASSIST ECU. Refer to  REMOVAL [10/2017 - 10/2020] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR