Driver Air Bag Module; Air Bag Clock Spring - Lifan 620 Maintenance Manual

2. Driver air bag module

The un-removable driver air bag module, containing gas generator, bag, ornamental cap and a
series of auxiliary components, is installed in the central ornamental cap of the steering wheel, as
shown in Fig. 5-2.
The main functions of the driver air bag module: Under normal usage, the driver air bag module
shall receive ignition signal from SRS ECU (Supplement Restraint System Electronic Control Unit)
after certain collision and then spark the gas generator and produce abundant air rapidly for the
deployment of air bag. With all of these, the driver can be protected.

3. Air bag clock spring

Driver air bag module, whose communication with ECU is carried out through air bag clock spring,
is installed on the steering wheel and turns simultaneously with the steering wheel. The clock
spring, comprising of swirly cable, turnplate, housing, harness and auxiliary components etc., is
installed on the combination switch, as shown in Fig. 5-3.
The working principle of air bag clock spring: The installation housing of the clock spring is fixed on
the steering column, and the upper part of the clock spring turn plate is inserted into the steering
wheel, and the swirly cable is installed between the turnplate and installation housing. When the
steering wheel turns left or right, the clock spring turnplate will turn simultaneously with the
steering wheel, turning the output end of the cable and stretching or tightening the swirly cable.
For this reason, the harness is prevented from being wound upon the steering column. Beyond
that, the continuity of the harness and the connection of the electronic signal are assured. Thus,
the harness of the clock spring is also the bridge for supplying electricity from the vehicle body to
the related functional components of steering wheel.
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Fig. 5-2
Fig. 5-3
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