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Home >> Volvo >> 2008 >> S40 T-5, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Battery, Brakes, Central Electronic Module (CEM), Climate Units, Engine Management System (Ems), Diagnosis - Design And Function (644 Body)) >> Central Electronic Module (CEM) (2000-2004) >> Wiper Functions >> Rheostat

Wiper Functions: Rheostat

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

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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