Light Control Rheostat: Inspection

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT LIGHT CONTROL RHEOSTAT

Disconnect the connector from the light control rheostat.

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

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
E55-1 (TC) - E55-3 (T)	Turn the light control rheostat knob fully downwards	Below 1 Ω
E55-1 (TC) - E55-3 (T)	Turn the light control rheostat knob fully upwards	8 kΩ or higher
E55-3 (T) - E55-4 (RV)	Turn the light control rheostat knob fully downwards	Below 1 Ω
E55-3 (T) - E55-4 (RV)	Turn the light control rheostat knob downwards to upwards	The value changes gradually (Between below 1 to 8 kΩ)
E55-3 (T) - E55-4 (RV)	Turn the light control rheostat knob fully upwards	8 to 12 kΩ

HINT:

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

Fig 1: Identifying Light Control Rheostat Connector With Resistance Graph