 SIEMENS AIRBAG 1 - System Overview |
| Introduced in 2002 in the Freelander, this ECU replaced the Sagem AC4. |
| SM071 - SIEMENS AIRBAG 1 - System Help file |
| Version 1.22 |
 SIEMENS AIRBAG 1 - Known Fitments | ||||||||
Vehicle makes, models and variants known or believed to be using this vehicle system, required diagnostic lead and degree of known compatibility.
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 SIEMENS AIRBAG 1 - Physical Details |
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 SM071 - SIEMENS AIRBAG 1 - Diagnostic Capabilities (Read Fault Codes) |
| Reads the fault code memory. The ECU can self detect up to 22 different problems with itself, its wiring and its associated sensors, storing the respective code if it detects any malfunction or reading outside of pre defined acceptable limits. Not all stored faults may cause the fault warning lamp to illuminate. Each airbag system can self detect up to 24 faults. Most of these are major or safety related faults causing full system shutdown with only a few being minor caused by, for instance a flat battery. The systems perform a self-diagnostic test that takes about 15 seconds whenever the ignition is switched on, logging any faults that are found, and then at regular intervals thereafter. There is a deep memory within the airbag ECU that keeps a long-term record of resets to detected faults. This means that if a particular connection was poor and went open circuit - even just once - the fault would be logged by the system as - a sensor is open circuit - and the airbag warning light would come on. If the fault was not found and the fault code memory was cleared it would be very likely to reappear. This would be logged as an intermittent fault within the system. |
| SM071 - SIEMENS AIRBAG 1 - Diagnostic Capabilities (Clear Fault Codes) |
| This function checks the fault code memory for resident faults and clears the fault code memory if the fault has been rectified. Having deleted the faults the system then rechecks the fault memory to ensure that it is clear. Failure to clear the fault memory successfully is usually due to the system re-logging the fault the moment the fault memory is clear, meaning that the fault has not been rectified properly and as far as the system is concerned, still exists. The system may also carry out a re-check for successful clearing of the fault code memory but then the system may re-log the fault shortly after. |
| SM071 - SIEMENS AIRBAG 1 - Diagnostic Capabilities (Settings) |
Values, configuration settings, and other stored information which can be read from the ECU, edited and then rewritten back. Read settings can also be stored as a standard HTML page for reference. These pages can then later be re loaded and re written back to the ECU. Please note that some values may be read only due to the fact that they are supplied from the ECU’s ROM or are internally calculated.
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