TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-47
Code No.27: Driver's seat belt pre-tensioner (squib) system (open-circuited in the squib circuit) <L.H.
drive vehicles>
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 pre-tensioner will deploy.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if driver's seat belt
pre-tensioner squib wire(s) are open-circuited.
PROBABLE CAUSES
•
Improper connector contact
•
Open circuit in the driver's seat belt pre-tensioner
(squib) circuit
•
Malfunction of the SRS-ECU
SEAT BELT
PRETENSIONER
(LH)
CONNECTOR
LOCK
SWITCH
AIR BAG
DRIVE CIRCUIT
NOTE
CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
SRS-ECU
MICROCOMPUTER
CONNECTOR
LOCK
SWITCH
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
AC301789AB
Driver's Seat Belt Pre-Tensioner (Squib)