Operating Light Control Rheostat does not Change Light Brightness [02/2017 - ]: 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.
   1. Combination Meter.

      Body Electrical > Combination Meter > Data List 

      Tester Display	Measurement Item	Normal Condition	Diagnostic Note
      Tail Cancel SW	Tail cancel switch/ OFF or ON	OFF: Tail cancel switch off ON: Tail cancel switch on	-
      Rheostat value	Rheostat value/ Min.: 0 Max.: 100	Light control rheostat switch is Dark (0) → Bright (100)	Unit: %

      Body Electrical > Combination Meter > Data List 

      Tester Display
      Tail Cancel SW
      Rheostat value

   Result

   Result	Proceed to
   The Data List values of ECUs match.	A
   The Data List values of ECUs do not match.	B

Result: 

A 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [02/2017 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

Result: 

B 

See step  2

1. Remove the light control rheostat

   Refer to REMOVAL [02/2017 - ]

2. Inspect the light control rheostat

   Refer to INSPECTION [02/2017 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE LIGHT CONTROL RHEOSTAT. Refer to  REMOVAL [02/2017 - ] 

Result: 

OK 

See step  3

1. Disconnect the F4 combination meter assembly connector.
2. Disconnect the F128 light control rheostat connector.
3. Measure the resistance according to the value(s) in the chart below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   F4-25 (SW1) - F128-7 (T)	Always	Below 1 Ω
   F4-26 (SW2) - F128-3 (RV)	Always	Below 1 Ω
   F4-20 (SW3) - F128-1 (E)	Always	Below 1 Ω
   F4-24 (TC) - F128-5 (TC)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   F4-24 (TC) - Body ground	Always	10 kΩ or higher
   F4-25 (SW1) - Body ground	Always	10 kΩ or higher
   F4-26 (SW2) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [02/2017 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR