Diagnosis
Electrical system
27
Introduction of the smart fortwo, Model Series 451
Diagnosis capability
The following control units have diagnosis capability:
• Instrument cluster
• Restraint systems control unit
• WSS control unit
• ME-SFI [ME] control unit
• SAM control unit
• Automated manual transmission control unit
• Heater/AC operating unit
• ESP control unit
• Steering assist control unit
• TPM [RDK] control unit
• Electronic selector lever module control unit
Fault memory
Each of the control units listed above has a fault
memory that provides information about the associ-
ated systems. The stored faults are displayed by the
diagnostic tester and must be rectified. When all the
faults have been eliminates, the fault memory must be
erased and read out again. There should be no fault
entries left afterwards.
Maintenance intervals
The diagnostic tester is used to reset the mainte-
nance interval in the instrument cluster following an
Oil Service Plus or a maintenance service.
Programming control units
The following control units can be programmed:
• ME-SFI [ME] control unit
• SAM control unit
• Automated manual transmission control unit
• ESP control unit
TAN generator
For the following applications a TAN (transaction
number) must be generated:
• Retrofitting the steering wheel gearshift (SAL)
• Replacing the ME-SFI [ME] control unit
• Replacing the SAM control unit
• Teach-in of transmitter keys (after loss or
detection of additional transmitter keys)
SCN (Software Calibration Number) coding
The following control units can be coded via the SCN
coding process:
• ME-SFI [ME] control unit
*)
• SAM control unit
• ESP control unit
• Automated manual transmission control unit
*)
• Restraint systems control unit
• Instrument cluster
*) The control unit is relevant to exhaust emissions,
i.e. the SCN is written in the control unit and can be
interrogated. For the other control units a virtual SCN
is generated during the coding process, but this is not
written to the control unit.
i Note
Up to six transmitter keys in total can be taught in
at the same time.
SN_Typ 451_us.book Seite 27 Freitag, 30. November 2007 1:56 13
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