578 / 1002
BRAKES
59
Important notes on checking for crossed connections while troubleshooting:
The hydraulic connections to the hydraulic modulator can be crossed over; the ECU self-diagnosis will not
detect it as a fault; nor will it cause the system to be shut down or cause a fault code to be logged in the
ECU.
WARNING:
When the hydraulic modulator is exchanged or repaired, the brake pipes to the solenoids must be
tested for correct assignment using a diagnostics tester. When the inlet and outlet valve are
activated, e.g. on the front left wheel, this must generate the necessary changes at the wheel. If
this does not happen, the pipes have been crossed over. This will cause the system to function
incorrectly.
Table of ABS 9 – Fall-back level:
ABS fallback level
ABS warning lamp
Brake COM lamp
Status
System
System active
Lamp
System active
Lamp
System active
with limitation
YES
OFF
NO
ON
System active
YES
OFF
YES
OFF
Emergency - EBD
NO
ON
YES
OFF
System passive
NO
ON
NO
ON