What is a Saab 900 Aero airbag control unit?
The Saab 900 Aero airbag control unit is the central safety unit in the vehicle, activating all occupant restraint systems in the event of a collision. It precisely monitors the sensors used to detect impact events and stores important crash data, ensuring the proper functioning of all airbag modules and seatbelt pretensioners for maximum safety.
This electronic module, also called the Airbag Control Module, is programmed specifically for the vehicle.
It acts as the brain of the passive safety system and is crucial for the reliable triggering of the protective mechanisms.
Why is the Saab 900 Aero airbag control unit defective?
A Saab 900 Aero airbag control unit can be defective because it stores crash data after an accident, preventing reactivation, or because of internal electronic errors. Typical causes include age-related material fatigue, moisture damage, or overvoltage. These defects cause the system to no longer function, and the airbag warning light to remain permanently illuminated.
After an impact event, the control unit stores crash data, which must be deleted before the vehicle can be put back into operation.
Internal memory errors or self-diagnosis errors also prevent the airbag system from functioning correctly.
Faulty power supply or poor connector contacts can also cause the Saab 900 Aero airbag control unit to fail, requiring professional repair.
Common error codes for Saab 900 Aero airbag control unit repair
When repairing the Saab 900 Aero airbag control unit, certain error codes directly indicate problems with the control unit itself. These B-codes are internal to the system and often require special diagnostic equipment to precisely analyze and correct the defect in order to restore full functionality of the passive safety system.
- B1000 → Control unit communication error → Error in the ECU communication with the vehicle
- B0020 → Error in the airbag control unit memory → Internal memory defect in the SRS module
- B0030 → Airbag control unit self-diagnosis error → Internal self-test error of the ECU
- B0040 → Error in the airbag control unit – internal errors → Hardware or software error in the module
- B0050 → Control unit power supply error → Power supply interruption to the SRS module
- B0060 → EEPROM memory error in the control unit → Defect in the non-volatile memory of the module
These error codes are specific to the control unit and not to sensors or belt pretensioners.
Reading and resetting requires diagnostic tools such as the Saab Tech 2 device.
What part numbers are available for Saab 900 Aero airbag control unit repair?
For Saab 900 Aero airbag control unit repair, two precisely validated OEM part numbers are primarily relevant: the Saab OEM number 4433645 and the Bosch supplier part number 5WK4080. These numbers identify the original airbag control unit, which is compatible with the Saab 900 Series 2 and is essential for a professional repair or replacement.
Part number 4433645 is the original Saab part number for this specific airbag control unit.
In parallel, the Bosch number 5WK4080 is listed as the corresponding supplier OEM number, which proves its authenticity.
Other part numbers refer to different Saab models or control units and are not compatible for the Saab 900 Aero airbag control unit repair.