ignition switch is ON to supply the squib ignition ,current,
even if the power cable from the battery is broken by the
collision, to inflate the air bag as soon as the front
impact sensor and safing impact sensor are
simultaneously switched ON.
Caution
Make sure that the SRS diagnosis unit is never
disassembled.
Component Main Monitoring Point Diagnosis
Code No.
Short-circuit
11
Front impact sensor Open-circuit once
12
Open-circuit twice
13
Short-circuit
21
Squib
Open-circuit
22
Terminal voltage high
31
Condenser
Terminal voltage low
32
Cranking detection circuit Cranking signal detection time
33*
1
-
INTERIOR - Supplemental Restraint System (SRS)
SRS DIAGNOSIS UNIT
The SRS diagnosis unit monitors the impact sensors,
squib, wiring harness, condensers, battery voltage etc. It
detects a problem, it and illuminates the "SRS" warning
lamp to alert the driver. It also stores in memory what
the problem is, and the duration of the problem (the
duration during which the warning lamp kept ON).
The condeilsers provided in the diagnosis unit
accumulates electric energy during the period the
1.
Monitoring function
The SRS diagnosis unit monitors the items of the wirin
~
harness and
SRS components shown in the following table to check whether
they satisfy the specified values. When the ignition key is in "ON" or
"START" position, the SRS warning lamp should illuminate for about
7 seconds and then tun off.
This indicates that the SRS system is in operational order. I' the
SRS warning lamp does any of the following, immediate inspection
is needed.
(1) The SRS warning lamp does not illuminate as described above.
(2) The SRS warning lamp stays on for more than 7 seconds.
(3) The SRS warning lamp illuminates while driving.
The data of the fault is stored in terms of a diagnosis code ir the
non-volatile memory (EEPROM)
*. The duration of thE fault is also
stored in terms of the ON duration of the warning light.
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