Check audible warning system - AP54.30-P-5450A

MODEL 230 except CODE (P99) "AMG Black Series" special model 

Fig 1: Identifying Standing Lamps On And Off Switch

Courtesy of MERCEDES-BENZ USA

	Checking
1	Remove key from the ignition lock
2	Turn rotary light switch to position "Standing lamps ON" (2)
3	Open driver door	A warning chime must sound, otherwise: ↓ Repair as a separate repair order
4	Turn rotary light switch to position "Lights OFF" (1)