6. SRS warning lamp
SRS warning lamp can be observed in the instrument cluster, as shown in Fig. 5-6.
Fig. 5-6
When the self-diagnostic circuit of air bag ECU assembly detects fault, the SRS warning lamp
shall be illuminated so as to inform the driver of the malfunction of air bag system. Under normal
circumstances, the illumination of the warning lamp will last for 5s before run out when the ignition
switch has been turned to the position ON. However, in the special conditions, such as the circuit
contact malfunctions, intermittent faults, if the faults recorded by the air bag ECU are over 8 times,
the warning lamp will be lighted. Generally speaking, the driver should check the car in the service
station in time once the SRS warning lamp shows the abnormal signal.
When the self-diagnostic circuit of air bag ECU assembly detects fault, the SRS warning lamp
shall be illuminated so as to inform the driver of the malfunction of air bag system. Under normal
circumstances, the illumination of the warning lamp will last for 5s before run out when the ignition
switch has been turned to the position ON.
II. Working principle of air bag system
When frontal collision accident occurs, the collision sensor shall produce signal for the collision,
and the air bag ECU shall detect and analyze the collision signal to determine the necessity for
ignition requirement. If necessary, the ignition impulse shall be sent out immediately, the ignition
pipe in each air bag module will be ignited, and then the gas generating material in each of the air
bag module shall be ignited by the ignition pipe. Therefore, abundant gas generated in extremely
short time shall inflate the air bag suddenly, forcedly open the ornamental cap, and the fully
inflated air bag will be formed. By this way, the impact upon the driver and passenger arising from
the collision accident shall be absorbed, and the injury of the driver and the passenger shall be
avoided or lessened.
III. Safety rules for air bag maintenance
During the maintenance of air bag system, unexpected deployment may occur if correct operation
procedure is not carried out, which shall lead to serious accident. Beyond that, the air bag may fail
to deploy if the maintenance operation is incorrect. Therefore, please carefully read the following
notes and take correct operation procedure.
1. Inspection, installation and maintenance shall be carried out by professionals.
2. Inspecting lamp, common voltmeter and ohmmeter shall not be used during inspection, and
special voltmeter and ohmmeter (minimal 10k/V) shall be used for measuring voltage and
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