Defect Code 18

Defect Code 18:

Defect symptom:

The ASC multi-function lamp goes out correctly after engine start. The ASC system does not operate although the slip of the rear wheels is sufficiently high. (the ASC multifunction lamp remains off)

Possible causes:

Brake light switch defective

Short on the wire from the brake light switch to ABS/ASC control unit

Troubleshooting:

Disconnect ABS/ASC control unit and switch on ignition

Measure voltage at Pin 15:

Nominal value < 1 V;

Depress brake pedal and measure voltage once again:

Nominal value approx. 12 V.

it nominal values are not achieved, renew brake light switch or check wire from brake light switch to ABS/ASC control unit Pin 15 and repair if necessary.