Page 171 - Workshop Manual - Tunland (2017)

DIAGNOSTICS - SRS SYSTEM 04-33

SRS SYSTEM

PRECAUTION
DANGER

This model equipped with SRS system. Failure to carry out service operations in the
correct sequence may cause the SRS to unexpectedly deploy during servicing, or 04
even lead to critical accident. Furthermore, an operational mistake may also prevent
the SRS from normal operations. Operation can only be started 90 seconds after the
ignition switch is turned to the “LOCK” position and the negative (-) cable and the
positive (+) cable are disconnected from the battery. (The SRS is equipped with backup
power supply.Therefore, if any operation is taken within 90 seconds after disconnecting
the battery negative (-) cable and positive (+) cable, the SRS may deploy suddenly.)
Do not expose the horn button assembly to heat or open fire.

CAUTION

Since it is difficult to identify the failure of the SRS, Diagnostic Trouble Code (DTC) is
an essential source of information during troubleshooting.Thus, when troubleshooting
the SRS, be sure to remember to check the DTCs before disconnecting the battery.
Even after a minor impact that the SRS assembly does not deploy, it is always important
to check the horn button assembly and airbag ECU. In case impact may be caused on
SRS control module when conducting maintenance, do remember to disconnect SRS
control module ECM first. Never use any SRS part removed from another vehicle. If
replacement is required, be sure to use new spare parts. Do not disassemble the horn
button assembly. If the horn button assembly has been dropped, or there are cracks,
dents or other faults on the housing, replace it with a new one. Use a multimeter with
high resistance to troubleshoot the SRS electrical circuits. During servicing, be sure
to follow the instructions on the labels attached to the SRS components. After repairing
the SRS, remember to check the airbag indicator lamp. When the negative (-) cable is
disconnected from the battery, the memory of the clock and the radio system will be
reset. So before repairing, record all necessary data. At the end of repairing, reset the
radio system and the clock. Never use any backup power supply from another vehicle,
which may reset the memory of the systems.The backup power supply will power up
the SRS, which may unexpectedly deploy the airbag during servicing.