Display does not Dim when Light Control Switch is Turned ON [08/2019 - ]: Procedure

1. Turn the light control switch to the tail or head position.
2. Check that the daytime screen setting on the display adjustment screen is set to on.

   Result

   Result	Proceed to
   Daytime screen setting is set to on.	A
   Daytime screen setting is set to off.	B

Result: 

A 

CHANGE DAYTIME SCREEN SETTING TO OFF 

Result: 

B 

See step  2

1. Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Refer to OPERATION CHECK [08/2019 - 07/2020] , or refer to OPERATION CHECK [07/2020 - ]

2. Check that the display changes between ON and OFF according to the light control switch operation.

   OK

   Light Control Switch	Display
   Tail or head	ON
   Off or AUTO	OFF

   HINT: 

   • The display is updated once per second. It is normal for the display to lag behind the actual switch operation.
   • Make sure to move the vehicle to a bright area before performing an operation check with the light control switch in the AUTO position.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

Result: 

NG 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2019 - 07/2020]  , or refer to  PROBLEM SYMPTOMS TABLE [07/2020 - ]