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SUPPLEMENTARY RESTRAINT SYSTEM (SRS)
16
11.1.6.2.3 AIR BAGS
A. DRIVER AIR BAG (DAB)
The driver airbag module is located in the steering
wheel and its function is controlled by the SRS ECU.
A bag within the module inflates to protect the driver
in the event of a collision severe enough to deploy
the system.
The driver airbag module connects to the steering
column wiring harness via a rotary coupler called as
clock spring. Within the driver airbag module is a
squib which, when given the correct current by the
SRS ECU, inflates the airbag by initiating a chemical
reaction. In deployment, the airbag inflates within a
fraction of a second and then deflate at a controlled
rate as the driver body regions; typically head and
chest interact with airbag. Vents in the airbag control
its deflation.
The SRS ECU regularly applies a test current to the
driver airbag squib to confirm continuity of the igni-
tion circuitry.
ON VEHICLE REPAIR
!! WARNING
The system has back-up power for about 30 sec-
onds after the battery is disconnected. Wait for at
least ONE minute after disconnecting the battery
before servicing the vehicle.
Always work on the air bag module from the side.
Always carry the module with the cover side up-
permost or away from the body in case being car-
ried vertically. Do not attempt to repair, open or
apply power (Multimeter) to the air bag module
terminals.
! CAUTION
Disconnect the battery negative lead.
REMOVAL
1. Disconnect the battery connections.
2. Pull out the cap from the bottom cover and loosen
the screw which holds the horn pad assembly.
Follow the same procedure at the other end also.
3. Pull out the horn pad assembly carefully.