Operating Light Control Rheostat does not Change Light Brightness: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Combination Meter / Data List.
5. Check the values by referring to the table below.
   COMBINATION METER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Light Control Up Switch	Light control rheostat up switch/OFF or ON	OFF: Light control rheostat up switch not pressed	-
   		ON: Light control rheostat up switch pressed
   Light Control Down Switch	Light control rheostat down switch/OFF or ON	OFF: Light control rheostat down switch not pressed	-
   		ON: Light control rheostat down switch pressed

   OK

   The value displayed on the Techstream changes with the actual light control rheostat switch operation.

NG → See step   2 

OK → See step   4 

1. Remove the trip switch. Refer to REMOVAL [06/2012 - ] .
   Fig 1: Measure The Resistance Of Trip Switch

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 (IG) - 5 (E)	Light control rheostat up switch pressed	Below 1 Ω
   	Light control rheostat up switch not pressed	10 kΩ or higher
   	Light control rheostat down switch pressed	Below 1 Ω
   	Light control rheostat down switch not pressed	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Trip Switch)

NG → See step   5 

OK: Go to next step 

1. Disconnect the H14 combination meter assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H14-24 (TR) - H64-3 (IG)	Always	Below 1 Ω
   H14-24 (TR) - Body ground	Always	10 kΩ or higher
   H64-5 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4