2009 Mercedes SLR McLaren Owner's Manual - Page 306

Practical hints What to do if ... Problem Possible cause/consequence The yellow ABS indicator lamp comes on while the engine is running. Risk of accident! The ABS has detected a malfunction and has switched off. The BAS and the ESP® are also switched off. Suggested solutions Continue driving with added caution. Wheels may lock during hard braking, reducing steering capability. Have the system checked at an authorized Mercedes-Benz Center immediately. - If the ABS control unit is malfunctioning, other systems such as the automatic Failure to follow these instructions increases transmission may also be malfunctioning. the risk of an accident. The electro-hydraulic brake system is still functioning normally but without ABS available. The charging voltage has fallen below 10 volts. The ABS has switched off. The battery may not be charged sufficiently. Read and observe messages in the multifunction display ( page 319). When the voltage is above this value again, the ABS is operational again and the ABS indicator lamp should go out. If the ABS indicator lamp does not go out: Have the generator (alternator) and the battery checked. 306