Operating Light Control Rheostat does not Change Light Brightness [03/2017 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Combination Meter / Data List.
5. Read the Data List according to the display on the Techstream.

   Body Electrical > Combination Meter > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Light Control Switch (UP)	Light control rheostat up switch (Trip switch)	OFF or ON	OFF: Switch released ON: Switch pushed	-
   Light Control Switch (DOWN)	Light control rheostat down switch (Trip switch)	OFF or ON	OFF: Switch released ON: Switch pushed	-

   Body Electrical > Combination Meter > Data List 

   Tester Display
   Light Control Switch (UP)
   Light Control Switch (DOWN)

   OK

   Light control rheostat up or down switch condition displayed on the Techstream changes with the actual switch operation.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 10/2020]  , or refer to  REMOVAL [10/2020 - ] 

Result: 

NG 

See step  2

1. Remove the trip switch.

   Refer to REMOVAL [03/2017 - ]

2. Inspect the trip switch.

   Refer to INSPECTION [03/2017 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE TRIP SWITCH. Refer to  REMOVAL [03/2017 - ] 

Result: 

OK 

See step  3

1. Disconnect the K20 combination meter assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K111-4 (RV) - K20-2 (TR)	Always	Below 1 Ω
   K111-1 (E) - K20-5 (SW3)	Always	Below 1 Ω
   K111-4 (RV) or K20-2 (TR) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 10/2020]  , or refer to  REMOVAL [10/2020 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR