"CHK" message(s) are displayed on the SIGNAL CHECK screen. [06/2018 - 08/2021]: 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
   "CAN" displays "CHK" (red)	B
   "SHIFT" displays "CHK" (red)	C

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  DIAGNOSIS SYSTEM [06/2018 - 10/2019]  , or refer to  DIAGNOSIS SYSTEM [10/2019 - 08/2020]  , or refer to  DIAGNOSIS SYSTEM [08/2020 - 08/2021] 

Result: 

C 

See step  4

Result: 

A 

See step  2

1. Disconnect the G32 panoramic view monitor switch connector.
2. Disconnect the N44 parking assist ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N44-15 (BLSW) - G32-4 (ECU)	Always	Below 1 Ω
   G32-2 (E) - Body ground	Always	Below 1 Ω
   N44-15 (BLSW) or G32-4 (ECU) - 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 switch.

   Refer to REMOVAL [06/2018 - 08/2021]

2. Inspect the panoramic view monitor switch.

   Refer to INSPECTION [06/2018 - 08/2021]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE PARKING ASSIST ECU. Refer to  REMOVAL [06/2018 - 09/2022] 

Result: 

NG 

REPLACE PANORAMIC VIEW MONITOR SWITCH. Refer to  REMOVAL [06/2018 - 08/2021] 

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  PROBLEM SYMPTOMS TABLE [06/2018 - 08/2020]  , or refer to  PROBLEM SYMPTOMS TABLE [08/2020 - 08/2021] 

Result: 

OK 

See step  5

1. Disconnect the N44 parking assist ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   N44-14 (REV) - Body ground	Engine switch on (IG), shift lever in R	11 to 14 V
   N44-14 (REV) - Body ground	Engine switch on (IG), shift lever not in R	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE PARKING ASSIST ECU. Refer to  REMOVAL [06/2018 - 09/2022] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR