Operating Light Control Rheostat does not Change Light Brightness [02/2024 - ]: Procedure

1. Using the GTS, read the Data List.

   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 condition displayed on the GTS changes with the actual switch operation.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [02/2024 - ]

Result: 

NG 

See step  2

Refer to INSPECTION [02/2024 - ]

Result

Result: 

NG 

REPLACE LIGHT CONTROL RHEOSTAT 

Refer to REMOVAL [02/2024 - ]

Result: 

OK 

See step  3

1. Disconnect the E7*1, E8*1 or E5*2 combination meter assembly connector.
   1. *1: for 7 Inch Multi-information Display Type
   2. *2: for 12.3 Inch Multi-information Display Type
2. Disconnect the E74 light control rheostat connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   FOR 7 INCH MULTI-INFORMATION DISPLAY TYPE
   
   

   Tester Connection	Condition	Specified Condition
   E8-25 (SW) - E74-5 (T)	Always	Below 1 Ω
   E8-26 (TC) - E74-3 (TC)	Always	Below 1 Ω
   E8-27 (SW2) - E74-4 (RV)	Always	Below 1 Ω
   E7-36 (SW3) - E74-2 (E)	Always	Below 1 Ω
   E8-25 (SW) or E74-5 (T) - Body ground	Always	10 kΩ or higher
   E8-26 (TC) or E74-3 (TC) - Body ground	Always	10 kΩ or higher
   E8-27 (SW2) or E74-4 (RV) - Body ground	Always	10 kΩ or higher
   E7-36 (SW3) or E74-2 (E) - Body ground	Always	10 kΩ or higher

   FOR 12.3 INCH MULTI-INFORMATION DISPLAY TYPE
   
   

   Tester Connection	Condition	Specified Condition
   E5-11 (SW) - E74-5 (T)	Always	Below 1 Ω
   E5-10 (TC) - E74-3 (TC)	Always	Below 1 Ω
   E5-28 (SW2) - E74-4 (RV)	Always	Below 1 Ω
   E5-26 (SW3) - E74-2 (E)	Always	Below 1 Ω
   E5-11 (SW) or E74-5 (T) - Body ground	Always	10 kΩ or higher
   E5-10 (TC) or E74-3 (TC) - Body ground	Always	10 kΩ or higher
   E5-28 (SW2) or E74-4 (RV) - Body ground	Always	10 kΩ or higher
   E5-26 (SW3) or E74-2 (E) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY 

Refer to REMOVAL [02/2024 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR