Renewing the control unit

After the DSC control unit has been replaced, the following work must be performed in this order.

1. Coding

2. Calibration of the DSC sensors

Steering angle sensor
Rotation rate sensor
Transverse acceleration sensor

3. End-of-line test (without driving curves with pressure sensor test)

The end-of-line test serves to check the DSC sensors in the plant at the end of the assembly line. This test is active on every factory-new DSC control unit and it must therefore also be run every time a factory-new DSC control unit is fitted.

Procedure for end-of-line test:

The sequence varies depending on the vehicle model and control-unit version. Due to the identification of the DSC control unit by the DIS tester, the following procedure results.

Disconnect the diagnostic plug to exit from the diagnostic mode.
Switch off the ignition for at least 10 seconds to perform a reset of the DSC.
Switch on ignition: After ignition on, the DSC indicator lamp, the ABS indicator lamp and the general brake warning light come on simultaneously (the end-of-line test is active).
Standstill calibration: Within the first 2 seconds after ignition on, the control unit automatically runs the standstill calibration.
Check of the pressure sensor: After the standstill calibration, you must press the brake pedal strongly within 20 seconds (if necessary, start the engine).

The end-of-line test has been completed successfully when the DSC indicator lamp, the ABS indicator lamp and the general brake warning light come on.

Faults during end-of-line test:

If the end-of-line test is not concluded successfully (all indicators remain on), the DSC is not working and at least the fault ”6D end-of-line test not carried out” is entered in the fault code memory with the status ”currently present”.

The end-of-line test must be repeated. If the end-of-line test fails a second time, it is likely that there is a fault in the area of the rotation rate and transverse acceleration sensor. Run troubleshooting.