Maintenance of electrical applicances
22-67
(2) The inspection with the fault diagnostic apparatus
After the fault existing in the safety air bag system is found with the safety air bag alarm light, special
fault inspection apparatus may be used for confirming the concrete fault. The inspection process
chart is indicated by Fig. 7.2 The fault diagnosis process as below:
Fig. 7.2 The diagnosis process chart for the safety air bag fault
7.3 The maintenance for the safety air bag system
Once the safety air bag has any fault, it needs to be maintained by professional repair man,
non-professional personnel may not conduct the maintenance work for the system.
Warning: On the professional personnel may conduct the maintenance work for the safety air
bag system, otherwise it shall cause grave human injury.
(1) The preparation work before the maintenance
Before the maintenance, it needs first to remove the power supply to the vehicle, the method is as
follows: Remove the cathode connection of the vehicle battery, use the insulation tape to wrap well
the wire connection head for insulation, and wait for 2 minutes.
Attention: Inside of the safety air bag control module (ACU) has the power cut-off protection
function, namely it shall keep the power supply for a short time inside the safety air bag control
module at the power supply is cut off. So it needs to cut off the power for enough long (2 minutes), in
order to enable the internal protection function to lose its efficacy.
Warning: Maintenance with electricity on for the safety air bag system is extremely dangerous, it
may greatly possible to cause grave human injury due to mistaken blast of the system.
Place the ignition
switch to ON
Is the alarm lamp
normal
Yes
Yes
No
No
To connect the
diagnosis
apparatus
Check and remove the
communication line and
the power line fault
Is the communication of
the diagnosis apparatus
normal
Read the fault
code
Remove the
historical fault
Read the current
fault
Record the fault
phenomenon
Cut off the
ignition switch
Complete the
fault diagnosis
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