Chevrolet Captiva Manual page 43

Sensing and Diagnostic Module (SDM)
The SDM is located on the floor beneath the centre
floor console assembly.
The SDM performs the following functions:
● Monitors the SIR electrical components and
sets a diagnostic trouble code when a
malfunction is detected.
●
Records any faults that are discovered.
●
Displays SIR diagnostic trouble codes and
system status information when connected to
a scan tool.
● Illuminates the airbag indicator to alert the
driver of any fault.
●
Provides a reserve power source to deploy the
airbags and pretensioners if an accident has
disabled the normal power source.
● Monitors vehicle velocity changes to detect
frontal impacts using its internal crash sensor.
●
Monitors signals from the side impact sensors
to detect side impact.
● Causes current to flow through the airbag
modules and pretensioners to cause
deployment if any impact equals the
requirements programmed in the SDM.
Restraint System
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