Light Control Rheostat: Inspection

WARNING: This page is about a different car, the 2008 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT LIGHT CONTROL RHEOSTAT

Remove the light control rheostat.

Fig 1: Identifying ODO/TRIP Switch Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value (s) in the table below.

Standard resistance

RESISTANCE REFERENCE CHART

Tester Connection	Condition	Specified Condition
R6-1 (E) - R6-7 (RV)	Rheostat knob is in the MIN. position.	Approx. 0 Ω
R6-1 (E) - R6-7 (RV)	Rheostat knob is between the MIN. and MAX. position.	8 to 12 kΩ
R6-1 (E) - R6-4 (RSET)	ODO/TRIP switch is not pressed.	10 kΩ or higher
R6-1 (E) - R6-4 (RSET)	ODO/TRIP switch is pressed.	Below 1 Ω
R6-6 (TC) - R6-1 (E)	Always	8 to 12 kΩ
R6-6 (TC) - R6-5 (T)	Rheostat knob is in the MAX. position.	Approx. 0 Ω
R6-6 (TC) - R6-5 (T)	Rheostat knob is in the MIN. position.	10 kΩ or higher

Fig 2: Light Control Rheostat Resistance Graph

HINT:

If the value is not as specified, replace the light control rheostat.