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Home >> Volvo >> 2004 >> V40 Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Design And Function - Miscellaneous Systems >> Central Electronic Module (CEM) (2000-2004) >> Wiper functions >> Rheostat

Wiper functions: Rheostat

The rheostat can control the light intensity in 16 steps, with a 12% to 100% activation cycle.

If the key is in position 2, the rheostat controls the light intensity of the instrument lighting in the passenger compartment.

Central electronic module (CEM) reads off the thumb wheel's status (resistance) which is located beside the light switch, which then controls the light with an activation cycle.

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