Component Tests and General Diagnostics
Hall brake switchFunction
To check the function, there are two separate inputs that lead from the Hall brake switch to the engine control module. The signal of the main brake switch (BLON) is used to control both the cruise control and the electronic accelerator pedal. When the brake is operated, the cruise control is switched off and the last selected target speed is stored. The second switch (BEML) is used for a safety test.
Installation location
The brake switches are located on the pedal block.
Failure
If two brake signals do not match, the is regarded in the DME as a fault. The accelerator pedal signal is set to zero. As a consequence, there is no load signal for the DME and the motor remains running at idle. If this fault occurs when the cruise control is switched on, the system disables the function while driving. The system reports a fault and prohibits use of the cruise control function.