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Dismantling, Testing and Replacing the Light Switch

Model: Volvo S40 MK 1 - Years: 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
Part: Tail light bulb

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Sometimes, bulbs stop working, but after replacement, they still do not light up. When this happens, it is natural for those less experienced to think that a fuse might be blown, so they check the fuse board for the problem. However, this is not always the case; sometimes the culprit is elsewhere: the light switch.

Before confirming this diagnosis, it is advisable to test the light circuit by joining the two wires inside the connector using, for example, a paperclip: if they light up, the issue is indeed the switch. The removal process is very simple: you only need to remove the wheel, and you will find the connector near the driveshaft (driver's side).

Once disconnected, get a 24mm spanner and remove it. At this point, check it again with a multimeter, holding it in hand: if you do not read any resistance value, you have solved the problem.


Updated on 9 February 2026 by ScegliAuto


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