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Comparison Images EWS Oscilloscope Measurement

IMPORTANT: The DME/DDE must remain connected for the duration of the test-measurement routine. The CAS control unit should not be enabled. It transmits a continuous EWS immobilizer signal whenever Terminal 15 is hot.
Fig 1: Display - EWS Oscilloscope Measurement Signal OK Screen
G09895166Courtesy of BMW OF NORTH AMERICA, INC.

Please note that the "OK" assessment relates exclusively to the data wire and the signal shape. It cannot be determined whether the transmitted code is correct.

Fig 2: Display - EWS Oscilloscope Measurement Signal Not OK Screen
G09895167Courtesy of BMW OF NORTH AMERICA, INC.

The above signal indicates a fault in the DME/DDE.

Fig 3: Display - DME/DDE Signal Not OK
G09895168Courtesy of BMW OF NORTH AMERICA, INC.

The above signal indicates a wire fault or a fault in the CAS.

Fig 4: Display - Fault In CAS Signal Not OK
G09895169Courtesy of BMW OF NORTH AMERICA, INC.

The above signal indicates a short circuit to positive.

Fig 5: Display - Short Circuit To Positive Signal Not OK
G09895170Courtesy of BMW OF NORTH AMERICA, INC.

The above signal indicates a short circuit to earth or an open wire/circuit.

IMPORTANT: The DME/DDE must remain connected for the duration of the test-measurement routine.
Fig 6: Display - EWS Oscilloscope Measurement Signal OK Screen
G09895171Courtesy of BMW OF NORTH AMERICA, INC.

Please note that the "OK" assessment relates exclusively to the data wire and the signal shape. It cannot be determined whether the transmitted code is correct.

Fig 7: Display - EWS Oscilloscope Measurement Signal Not OK Screen
G09895172Courtesy of BMW OF NORTH AMERICA, INC.

The above signal indicates a fault in the DME/DDE.

Fig 8: Display - Fault In DME/DDE Signal Not OK
G09895173Courtesy of BMW OF NORTH AMERICA, INC.

The above signal indicates that the EWS vehicle immobilizer has not been enabled or that a short circuit to UBatt is present.

Fig 9: Display - Short Circuit To Open Wire/Circuit Signal Not OK
G09895174Courtesy of BMW OF NORTH AMERICA, INC.

The above signal indicates a short circuit to earth or an open wire/circuit.

IMPORTANT: The DSC must remained connected during the test-measurement operation.
Fig 10: Display - DSC Control Unit Signal Waveform
G09895175Courtesy of BMW OF NORTH AMERICA, INC.

The speed signal from the DSC control unit must be a rectangular signal with amplitude Ubat.

Fig 11: Display - Short Circuit To Positive Signal Not OK
G09895176Courtesy of BMW OF NORTH AMERICA, INC.

The above illustration indicates a short circuit to earth.

Fig 12: Display - Short Circuit To Earth Not OK
G09895177Courtesy of BMW OF NORTH AMERICA, INC.

The above illustration indicates an open wire or a problem related to the DSC.

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