Mercedes Benz R230 (SL) Dash Board Clock with Park Distance Indicators

Description

03-07 R230 MERCEDES SL500, SL550, SL55 AMG Center Dash Clock with PARKTRONIC WARNING DISPLAY & BUZZER OEM.
MB p/n A 001 542 20 23
I b
ought this as I believed mine was faulty but it functions exactly as my existing unit does, so the fault is elsewhere in my car.