Switch Lights of Remote Touch do not Illuminate [06/2018 - 09/2022]: Procedure

1. Perform the following procedure and check the switch illumination again.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Switch Illumination

   1. If the vehicle is in a bright area, move it to a dark area.

      HINT: 

      When the vehicle is in a bright area, the switch illumination may not turn on due to the automatic dimmer function.

   2. Set the rheostat to maximum brightness.

      HINT: 

      If the brightness of the rheostat is set to low, switch illumination may not be recognized even when the switch illumination turns on.

   3. If the light control switch is in the AUTO position, turn the switch to the tail or head position.

      HINT: 

      If the light control switch is in the AUTO position, the switch illumination will not turn on unless the surrounding area is dark.

      OK

      Switch illumination turns on.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END 

Result: 

NG 

See step  2

1. Enter self-diagnostic mode.

   Refer to OPERATION CHECK [06/2018 - 10/2019] , or refer to OPERATION CHECK [10/2019 - 08/2021] , or refer to OPERATION CHECK [08/2021 - 09/2022]

2. Operate the remote touch screen diagonally from the upper left to the lower right and check that the brightness of the switch illumination changes.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Switch Illumination
   *b	Remote Touch Screen

   NOTE:

   Since the remote touch screen may recognize a pinch in/out or flick operation if operated with 2 fingers, always use 1 finger to operate the remote touch screen in self-diagnostic mode.

   OK

   Brightness changes according to remote touch screen operation.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE REMOTE TOUCH (REMOTE OPERATION CONTROLLER ASSEMBLY). Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 09/2022] 

Result: 

OK 

See step  3

1. Disconnect the G56 remote touch (remote operation controller assembly) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   G56-2 (ILL+) - Body ground	Light control switch in tail or head position	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the G56 remote touch (remote operation controller assembly) connector.
2. Disconnect the G17 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G56-5 (ILL-) - G17-39 (ILL-)	Always	Below 1 Ω
   G56-5 (ILL-) or G17-39 (ILL-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Replace the remote touch (remote operation controller assembly) with a new or known good one.

   Refer to REMOVAL [06/2018 - 08/2020] , or refer to REMOVAL [08/2020 - 09/2022]

2. Check if the switch illumination turns on.

   OK

   The switch illumination turns on when the light control switch is in the tail or head position.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END 

Result: 

NG 

GO TO METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]