| Certain faults will only be detected by the self-diagnosis when the vehicle is moving. Perform a road test to check the function of the system. |
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| To avoid any risk of accident, observe the safety precautions when using test instruments while road testing the vehicle → Chapter „Safety precautions“. |
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| If you drive the vehicle after a fault has been detected by the self-diagnosis bear in mind that there is a risk of accident. The function of the brake system will be impaired. The brake pressure at the rear wheels is no longer controlled by the electronic brake pressure distribution function. This can result in excessive braking at the rear, and the tail of the vehicle may break out unexpectedly. |
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| The ABS/ESP function is deactivated when using vehicle diagnostic, testing and information system -VAS 5051 A- in the mode “vehicle self-diagnosis” while road testing the vehicle. However, this is not indicated by the warning lamps. Self-diagnosis of ABS with EDL control unit -J104- is terminated if a road speed of 20 km/h is exceeded. |
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| During the road test, maintain a speed above 60 km/h for a period of 30 seconds. After ensuring that it is safe to do so, apply the brakes hard enough to activate ABS-controlled braking. This can be felt from the pulsation at the brake pedal. |
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