Mercedes-Benz W203 SRS light on

Common causes are battery or alternator undervoltage, a fault in the seat sensor mat or its wiring, a poor connector and interference on the CAN bus (the car's internal data bus). The fault codes are read with a diagnostic tool, and the repair is done by a workshop.

B1035 means too high a resistance in the driver's side airbag deployment circuit, usually caused by a broken wire or a poor connector. B1003 means undervoltage, so the condition of the battery and alternator should be checked. Have a workshop do SRS work.

Clearing only empties the memory and does not fix the fault. Some lights go out by themselves once the fault is gone, others require the code to be deleted. If the light flashes when cold and no codes are found, measure the battery and alternator voltage. The cause should be found before clearing.