On-Board Diagnostics With Malfunction Memory
WARNING: This page is about a different car, the 2001 Mercedes-Benz SL500 and 2000 Mercedes-Benz SL500. However, it is still accessible from the selected car via links, so may be relevant.
Malfunction memory is incorporated in A/C push button control unit. Diagnostic Trouble Codes (DTCs) are registered, stored, and displayed on the temperature display. DTCs are retained in memory even if battery is disconnected.