Chery A15. Manual — part 157
Chery A15 Maintenance Manual
to avoid mistrigger of airbag. The safety sensor equipped to Chery A15 is composed
of a dual contactor and a motor switch.
The safety sensor is independent of electronic components when working. Airbag
ignition circuit is in “standby” status under normal running of vehicle and will be
activated when the inflation of airbag is necessary (above 6.4 acceleration of gravity).
3. Hairspring
A spiral wire harness is used to be placed between steering wheel and steering post to
ensure sufficient turning angle and avoid damaging connecting wire harness of airbag
subassembly. First fit the wire harness in helical spring, and then fix the helical spring
in spring housing. This subassembly is called hairspring. Generally horn wire harness
is also fitted in the helical spring.
Spec.
Outer diameter: Φ96m
Number of coils: Max. 6
Storage temperature: -40ºC~85ºC
Working temperature: -35ºC~85ºC
Working voltage: DC 9~16V
Working current (airbag configuration): Max. 16A, 40V-6ms
Current limit: Max. 5 seconds with 5A current
Voltage limit: Max. 100ms with DC 20V
Working torque: Max. 0.15ms
Hairspring
Chery A15 Maintenance Manual
Fixed on steering post.
Part of horn circuit.
Note: turning steering wheel for more than 4.5 turns will damage hairspring.
Turing steering wheel:
Turning steering wheel to one side tightens coil.
Turning steering wheel to another side releases coil.
Turning steering wheel for more than 4.5 turns will damage hairspring.
(Total turning range: 9 turns)
Warning: demounting hairspring will cause injury and car damage, therefore never
demount hairspring. If the airbag has been inflated, replace the hairspring. Please
demount airbag subassembly, hairspring and safety memory device before
maintenance of steering system. Before demounting or mounting airbag subassembly,
please disconnect battery cathode and wait for at least 1 minute.
Demounting/Mounting Hairspring
Hairspring is mounted between steering wheel and steering post. When demounting,
pay attention to mounting position and direction to avoid insufficient turning angle of
steering wheel or heavy steering.
It is necessary to check hairspring clearance during steering before demounting or
mounting hairspring.
Warning: to check clearance, carefully turn hairspring until resistance is felt, and then
turn back for about 4 turns and align with clearance mark.
Chery A15 Maintenance Manual
Turing mark
Fixed mark
Mounting
hairspring
4. Airbag Subassembly
(1) Airbag Subassembly
Airbag subassembly mainly consists of airbag cover, airbag, inflator subassembly.
Airbag is made of nylon fabric with chemical glue applied on inner layer to seal air
inside. Unused airbag is folded like a packed parachute between gas generator and
airbag cover. A tearing line is stamped on airbag cover to help inflated airbag tear
cover and reduce inflating resistance.
Generally the inflation will begin within 10ms after vehicle collision, and the total
inflating time is about 30ms. Airbag will spread along steering post with a sight
deflection toward windshield to prevent collisions of driver’s face with windshield
and the chest with steering wheel.
Vent holes are set on the backside of airbag (opposite to driver). When the diver hits
airbag due to inertia force, the air inside will be vented by the pressure to absorb the
kinetic energy from driver and protect driver’s body against injuries.
Inflator subassembly works to inflate airbag when ignitor is lighted to spread the
airbag. When computer sends command ignition signal, heating cord is switched on
and heated rapidly to ignite ignitor, which immediately will explode to generate heat
to make inflating agent release air to be inflated into airbag.
Chery A15 Maintenance Manual
Inflator assembly
Assembly base
Bolts
Tightening torque
Fixing ring assembly
Bumper pad
Cover
(2). BCM (Airbag Control Module)
An unrepairable component part which monitors other system component parts and
sends command to activate airbag.
Records any detected fault.
Turns on warning light to remind driver of fault.
Only to be diagnosed against code with diagnoser.
BCM controls the inflation and spread of airbag through following component parts:
. Safety sensor
. Capacitor
. Collision sensor or accelerometer.
(3). Capacitor
The capacitor provides power reserve.
(4). Bulb
Once the working voltage reaches BCM point, the warning light will be turned on, at
this moment we can check the bulb. BCM controls the light to keep on for about 4
seconds and then go out during the bulb check.
Fault Display
BCM records system faults in two modes.
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