Display does not Dim when Light Control Switch is Turned ON: Procedure

1. Check the symptoms that occur by viewing the display.

   Result

   Result	Proceed to
   There is a delay until the display dims after the navigation system is activated with the light control switch in the tail or head position.	A
   The display dims for a moment and then becomes bright after the navigation system is activated with the light control switch in the tail or head position.	B
   When the light control switch is set to the tail or head position, the display dims but does not switch to the night screen.	B
   When the light control switch is set to the tail or head position, the display neither dims nor switches to the night screen.	C

   HINT: 

   • When the navigation system is activated with the light control switch in the tail or head position, before AVC-LAN communication is established, the multi-display dims the display according to the illumination signal received via a direct line.
   • After AVC-LAN communication is established, the multi-display dims the display according to a dimmer signal sent via AVC-LAN communication.
   • The display and navigation module display switches between the daytime screen and night screen on the multi-display according to the illumination signal input.

B → See step   4 

C → See step   10 

A: Go to next step 

1. Disconnect the F37 multi-media module wire connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F37-6 (GND1) - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F37-4 (ILL) - F37-6 (GND1)	Light control switch in tail or head	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the F37 multi-media module wire connector.
   Fig 1: Identifying F37 Multi-Media Module Wire Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the DC1 multi-media module wire connector.
   Fig 2: Identifying DC1 Multi-Media Module Wire Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F37-4 (ILL) - DC1-2 (ILL)	Always	Below 1 Ω
   F37-6 (GND1) - DC1-13 (GND1)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (multi-media module wire)

NG → See step   11 

OK → See step   9 

1. Press the "DISP" switch on the remote touch.
   Fig 3: Identifying "DISP" Switch On The Remote Touch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the light control switch to the tail position.
3. Check if "Day mode" on the display adjustment screen is on.

   Result

   Result	Proceed to
   "Day mode" is on	A
   "Day mode" is off	B

   TEXT IN ILLUSTRATION
   
   

   *1

   Example

B → See step   5 

A → TURN "Day Mode" SETTING OFF 

1. Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check. Refer to OPERATION CHECK .
   Fig 4: Screen Display - Vehicle Signal Check Mode

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that the display changes between ON and OFF according to the light control switch operation.

   OK

   Light Control Switch	Display
   Tail or on	ON
   Off	OFF

   HINT: 

   The display is updated once per second. It is normal for the display to lag behind the actual switch operation.

NG → See step   6 

OK → See step   7 

1. Disconnect the F30 display and navigation module display connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F30-10 (GND1) - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F30-12 (ILL+) - F30-10 (GND1)	Light control switch in tail or head	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8