TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-71
YES :
Replace the SRS-ECU (Refer to
P.52B-
266
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
Code No.B1604: Seat belt pre-tensioner (driver's side) (squib) system (open-circuited in the squib
circuit)
AC805782
Seat Belt Pre-tensioner (Driver's Side) (Squib)
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
NOTE
: CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple
AE
SEAT BELT
PRE-TENSIONER
CONNECTOR
LOCK SWITCH
<RHD>
<LHD>
OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the front impact sensors and
the front air bag analogue G-sensor. If the impact is
over a predetermined level, the SRS-ECU sends an
ignition signal. At this time, if the front air bag safing
G-sensor is on, the seat belt pre-tensioner will
deploy.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if seat belt pre-tensioner
(driver's side) squib wire(s) are open-circuited.
PROBABLE CAUSES
• Improper connector contact
• Open circuit in the seat belt pre-tensioner
(driver's side) (squib) circuit
• Malfunction of the SRS-ECU