9000 L4-2290cc 2.3L DOHC Turbo EFI (1992)
Air Bag Control Module: Description and Operation
PURPOSE
The Airbag Control module processes data from the Impact sensors to control the deployment of the Airbags.
CONSTRUCTION
The control module contains a safety sensor of the same type as the front sensor, a microprocessor, a capacitor and the diagnostics unit.
OPERATION
Should a fault develop in the front sensor, the safety sensor prevents it from triggering the airbag in error. Mounting of the control module is
direction-dependent. In other words, it must be mounted facing in the right direction.
Each time a trouble code is recorded, a timer in the control module starts. When carrying out fault diagnosis it is then possible to see when the
fault first occurred. If the fault is intermittent, the number of times it has occurred will also be counted.
Up to five trouble codes can be stored in the memory simultaneously. The faults are stored in order of priority so that the "most important faults
are shown first when a readout is obtained on the scan tool. Faults which prevent activation of the airbags are assigned the highest priority.
Permanent faults are assigned a higher priority than intermittent faults. If an additional fault is to be recorded when five other faults have already
been stored in the memory, which is accordingly full, then the trouble code having the lowest priority will be erased to make room for the new
fault.
If the control module is not plugged in, the "SRS" symbol in the main instrument display panel's pictogram (SRS indicator) will light up as soon as
the ignition is switched ON.