TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-67
Code No.B1603: Seat belt pre-tensioner (driver's side) (squib) system (short-circuited between
terminals of 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 one seat belt pre-ten-
sioner (driver's side) squib wire shorted to the other.
PROBABLE CAUSES
• Improper engaged connector or defective short
spring*
• Short circuit between the seat belt pre-tensioner
(driver's side) (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-123, C-130, D-15 <LHD>
or D-23 <RHD> is damaged or improperly engaged,
the short spring may not be released when the con-
nector is connected.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code.
Q: Is diagnosis code B1519 set?
YES :
Go to Step 2.
NO :
Go to Step 3.