The seat occupancy sensor in most new Mercedes models may have 2, 3 or 4 wires:
- white, red, brown (3-wired mat)
- blue, brown, black (3-wired mat)
- black, black (2-wired mat)
- white, red, brown, green (4-wired mat in some models with WSS system, although wires colors may be different in case of the 4-wired seat mat)
Below there are photos of the versions. The photos were taken under passenger side seat.
3-wired seat occupancy sensor- brown, blue, black:
3-wired seat occupancy sensor- red, white, brown:
2-wired seat occupancy sensor - black, black:
4-wired seat occupancy sensor - GLA USA
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