This function is used for commissioning QMVH when replacing control unit. Data will be saved from the defective control unit to the new one, therefore the function should be started before replacing the control unit.
The rear axle stabilizer torque distribution (QMVH) controls the extra control elements on the rear axle and distributes the drive torque targeted between the two wheels on the rear axle. In PR-situations the system also has the name "Dynamic Performance Control".
Note:
If the rear axle stabilizer torque distribution does not work the control/warning lights for DSC and X-Drive are turned on. If a malfunction occurs an associated symbol shows a check-control message in the LCD.
Test conditions:
Ignition on, engine off.
The battery voltage should be >12V.
Procedure:
Start the function and follow the instructions in the program.
Replace the control unit.
Start the function and follow the instructions in the program.
The process runs for approx. 3 minutes.
Function complete.
After commissioning, run the test function "Function check QMVH rear axle stabilizer torque distribution".