TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-31
Code No.24: Passenger's (front) air bag module (squib) system (short-circuited between terminals of
the squib circuit)
OPERATION
•
The SRS-ECU judges how severe a collision is
by detecting signals from the front impact sensors
and the front air bag analog G-sensor. If the
impact is over a predetermined level, the
SRS-ECU outputs an ignition signal. At this time,
if the front air bag safing G-sensor is on, the SRS
air bag will inflate.
•
The ignition signal is input to the air bag module
via the clock spring to inflate the air bag.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if one passenger’s (front)
air bag squib wire shorted to the other. However, if no
diagnosis code resets, the SRS warning lamp will be
switched off (diagnosis code will be retained).
PROBABLE CAUSES
•
Improper engaged connector or defective short
spring*
•
Short circuit between the passenger's air bag
module (squib) circuit terminals
•
Damaged connector(s)
•
Malfunction of the SRS-ECU
NOTE: *: The squib circuit connectors integrate a
"short" spring (which prevents the air bag from
deploying unintentionally due to static electricity by
shorting the positive wire to the earth wire in the
squib circuit when the connectors are
disconnected).Therefore, if connector C-115 or C-09
is damaged or improperly engaged, the short spring
may not be released when the connector is
connected.
AIR BAG DRIVE
CIRCUIT
CONNECTOR
LOCK
SWITCH
NOTE
CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
CONNECTOR
LOCK
SWITCH
MICROCOMPUTER
SRS-ECU
AIR BAG MODULE
(SQUIB)
(PASSENGER'S
SIDE)
Wire colour code
B : Black LG : Light green
G : Green L : Blue
W : White Y : Yellow
SB : Sky blue BR : Brown
O : Orange GR : Gray
R : Red P : Pink V : Violet
AC301794
Passenger's (Front) Air Bag Module (Squib) Circuit
AB