Geely EC718, EC718RV, EC715, EC715RV. Manual part — 351

9.2 Airbag System

9.2.1 Specifications
9.2.1.1 Fastener Tightening Specifications

Applications

Model

Specifications

Metric (Nm)

US English (lb-ft)

Curtain Airbag Retaining Bolt

M6 × 16

7-10

5.2-7.4

Side Airbag Retaining Bolts

M6 × 16

4-4.5

3.0-3.2

Driver Front Airbag Bolts

M6 × 16

8.5-9.5

6.3-7.0

Passenger Front Airbag Bolts

M6 × 16

7-9

5.2-6.6

Side Collision Sensor Retaining Bolt

M6 × 20

7-9

5.2-6.6

Frontal Collision Sensor Bolts

M6 × 20

7-9

5.2-6.6

Airbag Electronic Control Unit Retaining Bolt

M6 × 20

7-9

5.2-6.6

Airbag Control Module Bracket Bolts

M6 × 20

7-9

5.2-6.6

Safety Protection Device

Airbag System

9-3

9.2.2 Description and Operation
9.2.2.1 Description and Operation

Note

Airbag system is unable to replace the seat belt
functions. If seat belts are not used, when the airbag is
deployed, it may cause serious personal injury. Geely
Automotive reminds you to wear and tighten your seat
belts. Only when seat belts are tighten, during a collision
system, airbag can provide supplementary protection for
the occupants.

Airbag System Description

Airbag system consists of the following components:

–

Airbag Warning Lamp

–

Instrument Cluster

–

Airbag Control Module Front Collision Sensor (Left / Right)

–

Driver Side Collision Sensor

–

Passenger Side Collision Sensor

–

Passenger Recognition Sensor

–

Driver Front Airbag

–

Passenger Side Airbag

–

Driver Seat Belt Pretensioner

–

Passenger Seat Belt Pretensioner

–

Driver Side Airbag

–

Passenger Side Airbag

–

Driver Curtain Airbag

–

Passenger Curtain Airbag

–

Inflator Module Coil

–

Airbag System Wiring Harness

–

Steering Wheel and Steering Column

Beside seat belts, airbag system provides additional protection
to passengers and it is a passive safety system. Airbag system
includes multiple inflatable protection module, distributed in
different locations of vehicles, including steering wheel,
instrument units, front seat back, the roof rails. In addition to
inflatable protection module, the vehicle can be equipped with
seat belt pretensioner. When a collision occurs, it will fasten
seat belts, inflatable the module, at the same time increase the

distance between passenger and airbag. Each inflatable
module has a detonating circuit, controlled by the airbag control
module. When the airbag control module detects the collision
impact is large enough, it deploys the airbag. Airbag control
module continuously monitors the airbag system electrical
components. When a circuit failure is detected, the airbag
control module will set a DTC code and turn on airbag warning
lamps to inform the driver. The steering column has adopted
energy-absorbing design. In the event of frontal impact, it will
contract, reducing the risk of driver injury.

Airbag control module receives the sensor signals to determine
the severity of the collision. When the signal value is greater
than the memory settings, airbag ignition control module
commands to start the corresponding inflatable airbag system
modules. When confronted with a large enough collision, front
airbags and seat belt pretensioners will be activated; When
confronted with a large enough side collision, side airbags,
curtain airbags and seat belt pretensioners will be activated.

When airbag control module confirms the collision signal, it will
send "collision unlock doors and stop fuel supply" signal to the
bus within 20 ms, a total of 30 cycles (100 ms a cycle, a total
of 3 s) . When BCM and EMS receive more than three
consecutive signals, respectively, unlocking doors and
stopping fuel supply will be implemented.

9-4

Airbag System

Safety Protection Device

9.2.3 System Working Principle
9.2.3.1 System Working Principle

Airbag Warning Lamp

Airbag warning lamp is located inside the instrument cluster
assembly, used to notify the driver airbag system failures and
examine whether the airbag control module is communicating
with the instrument panel. Turn the ignition key to "ON"
position, the airbag control module carry out system self-test.
If the system is normal, warning lamps flash 7 s and off. If a
malfunction is detected, airbag control module will store a
diagnostic trouble code (DTC), and then through the CAN-Bus
serial data bus, instruct the instrument cluster to light the airbag
warning lamp. After the vehicle starts, airbag control module
will continue to test each loop. If there is a malfunction, airbag
control module will communicate with the instrument cluster
through the CAN-Bus serial data bus, the airbag warning lamp
will be lit in 5 s. If there is a fault, airbag may fail to deploy, or
deploy when the crash does not reach the set collision severity.
If the airbag warning lamp is lit, please repair the vehicle at the
authorized service station as soon as possible. Before the
repair is completed, the airbag warning lamp will not be off.

Airbag Control Module

Note

Airbag control module has a back up power supply,
which can deploy the airbag, even if the battery voltage
is lost during a collision. Disconnect the battery negative
cable for at least 90s to empty the stored power supply,
before carry out the airbag system repair.

Airbag control module is a microprocessor, which is the airbag
system control center. When a collision happens, the airbag
control module will compare the signal from the sensor with the
value stored in the memory. When the generated signal
exceeds the stored value, the airbag control module will
command (electric current signal) to deploy airbags. When the
airbags are deployed, the airbag control module will record the
status of airbag systems, and light the airbag indicator on the
instrument cluster. After the vehicle starts, airbag control
module will continue to monitor the airbag system electrical
components and circuits. If an airbag control module
malfunction is detected, it will store a diagnostic trouble code,
and light the airbag warning lamp to inform the driver that a
malfunction exists.

Front Collision Sensor (Left / Right)

Front collision sensors are used to enhance the airbag system
performance. Front collision sensor is an acceleration sensor,
which sends the acceleration signal to the airbag control
module. Front collision sensor can help determine the severity
of a frontal collision. Airbag control module uses the measured
acceleration values to calculate and compare these calculated
values with values stored in the memory. When the calculated
value exceeds the value stored, the airbag control module will
issue a positive ignition command (electric current signal) to
activate the front airbag and seat belt pretensioner.

Driver Side Collision Sensor, Passenger Side
Collision Sensor

Each side collision sensor includes a sensing device for
monitoring vehicle acceleration to send vehicle lateral
acceleration signal to the airbag control module. Side collision
sensors can determine the severity of the side collision. Airbag
control module uses the measured acceleration values to
calculate and compare these calculated values with values
stored in the memory. When the calculated value exceeds the
value stored, the airbag control module will send a positive
ignition command (electric current signal) to activate the curtain
airbags, side airbags and seatbelt pretensioners.

Passenger Recognition Sensor

Passenger recognition sensor is located inside the passenger
seat cushion assembly and used to sense whether the
passenger seat is occupied by a passenger. It is a variable
resistance-type pressure sensor and senses the pressure
through the resistance changes. When the passenger seat is
occupied by a passenger, the seat belt warning lamp will be lit
to inform the driver to remind the passenger to fasten the seat
belt.

Driver Front Airbag, Passenger Front Airbag

Driver front airbag, passenger front airbag module includes a
shell, inflatable airbag, a detonating device and gas generating
agent. When the front collision impact force is large enough,
the airbag control module will command the front airbags to
deploy. Electric current flows through the ignition and activates
the gas generating agent to rapidly produce large amounts of
gas. The gas inflates the airbag. The airbag, once filled with the
gas, will deflate through holes in the airbag. Airbag control
module harness connector (driver front airbag, passenger front
airbag deployment circuits) has a short film. When the
connector is disconnected, the airbag deployment short circuit
will prevent the airbag accidental deployment during the repair.

Safety Protection Device

Airbag System

9-5

Driver Seat Belt Pretensioner, Passenger Seat
Belt Pretensioner

Driver seat belt pretensioner, passenger seat belt pretensioner
module includes a shell, a detonating device and gas
generating agent. The ignition device is part of the seat belt
pretensioner deployment circuit. When a vehicle front or side
collision impact force is large enough, the airbag control
module will command (electric current signal) the electric
current flow through the ignition to detonate the gas generating
agent and rapidly produce a large amount of gas. The reaction
produced gas will make the seat belt pretensioner quickly
tighten the seat belt. Airbag control module harness connector
(airbag deployment circuit) has a short film. When the
connector is disconnected, the airbag deployment short circuit
will prevent the airbag accidental deployment during the repair.

Driver Side Airbag, Passenger Side Airbag

Driver side airbag and passenger side side airbag are located
in the driver seat back and passenger seat back respectively.
Side airbag modules include airbags, detonating devices and
gas generating agent. The detonating device is part of the
airbag modules deployment circuit. When a side impact force
is large enough, the side collision sensor will detect the collision
and send a signal to the airbag control module. Airbag control
module will compare the signal from the side collision sensor
with the value in the memory. When the signal exceeds the
stored value, the airbag control module commands the side
airbag to deploy. When the passenger side collision happens,
it requires the driver side airbag, driver curtain airbag are not
deployed, while the passenger side airbag, passenger curtain
airbag deploy. Airbag control module continuously monitors
whether the airbag deployment circuit is faulty. In the event of
a fault, it will light the airbag indicator. Airbag control module
harness connector (airbag deployment circuit) has a short film.
When the connector is disconnected, the airbag deployment
short circuit will prevent the airbag accidental deployment
during the repair.

Driver Curtain Airbag, Passenger Curtain
Airbag

Driver curtain airbag, passenger curtain airbag are located on
the left and right roof rails, from the A-pillar extends to the C-
pillar. Curtain airbag module includes airbags, a detonating
device and gas generating agent. Detonating device is part of
the curtain airbag deployment circuit. When a side impact force
is large enough, side collision sensors will detect the collision
and send a signal to the airbag control module. Airbag control
module will compare the signal from the side collision sensor

with the value in the memory. When the signal exceeds the
stored value, the airbag control module commands the curtain
airbag to deploy. When the passenger side collision happens,
it requires the driver side airbag, driver curtain airbag are not
deployed, while the passenger side airbag, passenger curtain
airbag deploy. Airbag control module continuously monitors
whether the airbag deployment circuit is faulty. In the event of
a fault, it will light the airbag indicator. Airbag control module
harness connector (airbag deployment circuit) has a short film.
When the connector is disconnected, the airbag deployment
short circuit will prevent the airbag accidental deployment
during the repair.

Clock Spring

Airbag clock spring is located in the steering column below the
steering wheel. When the steering wheel rotates, the clock
spring maintains continuous electrical contact between the
airbag deployment circuit and the driver front airbag. The
steering wheel clock spring connector is equipped with a short
film which can short the driver front airbag deployment circuit,
in order to prevent the airbag accidental deployment during the
repair.

Airbag System Wiring Harness

Airbag system connects sensors, the control unit, inflatable
modules, airbag deployment circuits and CAN bus serial data
circuits together through the waterproof harness. The airbag
system deployment circuit connectors are yellow to facilitate
identify them. For airbag system wiring harness repair, please
refer to the appropriate testing and repair procedures in this
manual.

Steering Wheel and Steering Column

The steering wheel and steering column have adopted energy-
absorbing designs to absorb energy when the driver and the
steering wheel come into contact. When a vehicle front collision
happens, the driver may be contacted directly with the steering
wheel, or the impact will be loaded into the steering wheel and
steering column. The steering column will shrink down to
absorb some of the collision energy, thereby help to reduce the
driver personal injury. After a collision, you must check the
steering wheel and steering column damage.

9-6

Airbag System

Safety Protection Device