Mitsubishi L200. Manual — part 609
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-107
Code No.
Part/Circuit integral to SRS-
ECU
Trouble causes
B1404
Driver's air bag module (squib
ignition drive circuit)
• Short circuit in the squib ignition drive circuit
B1405
• Open circuit in the squib ignition drive circuit
B1414
Passenger's (front) air bag
module (squib ignition drive
circuit)
• Short circuit in the squib ignition drive circuit
B1415
• Open circuit in the squib ignition drive circuit
B1424
Side-airbag module (RH) (squib
ignition drive circuit)
• Short circuit in the squib ignition drive circuit
B1425
• Open circuit in the squib ignition drive circuit
B1434
Side-airbag module (LH) (squib
ignition drive circuit)
• Short circuit in the squib ignition drive circuit
B1435
• Open circuit in the squib ignition drive circuit
B1444
Curtain air bag module (RH)
(squib ignition drive circuit)
• Short circuit in the squib ignition drive circuit
B1445
• Open circuit in the squib ignition drive circuit
B1454
Curtain air bag module (LH)
(squib ignition drive circuit)
• Short circuit in the squib ignition drive circuit
B1455
• Open circuit in the squib ignition drive circuit
B1466
Analogue G-sensor (front air bag)
• When the analogue G-sensor is not operating
• When the characteristics of the analogue G-sensor
are abnormal
• When the output from the analogue G-sensor is
abnormal
B1467
Safing G-sensor (front air bag)
• Open circuit in the safing G-sensor
B1468
• Short circuit in the safing G-sensor
B1469
Analogue G-sensor (side air bag)
• When the analogue G-sensor is not operating
• When the characteristics of the analogue G-sensor
are abnormal
• When the output from the analogue G-sensor is
abnormal
B1478
Capacitor
• Voltage at the capacitor terminal is higher than the
specified value for five seconds or more
B1479
• Voltage at the capacitor terminal is lower than the
specified value for five seconds or more (This is not
detected if diagnosis code B1476 or B1477 indicating
battery positive voltage drop has been set).
B1496
Non-volatile memory (EEPROM)
• When the non-volatile memory (EEPROM) is
abnormal
B1497
Application specific integrated
circuit (for frontal activation)
• When the application specific integrated circuit (frontal
activation) is abnormal
B1498
ROM or RAM
• When the ROM or RAM is abnormal
B1499
Collision decision
• If this code is set before the air bags have deployed,
an internal failure may have occurred in the SRS-
ECU.
B1550
SRS warning lamp drive circuit
• Failure in SRS warning lamp drive circuit
B1557
Application specific integrated
circuit
• When the application specific integrated circuit is
abnormal
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-108
PROBABLE CAUSE
Malfunction of the SRS-ECU
DIAGNOSIS PROCEDURE
Replace the SRS-ECU (Refer to
B1607
Seat belt pre-tensioner (driver's
side) (squib ignition drive circuit)
• Short circuit in the squib ignition drive circuit
B1608
• Open circuit in the squib ignition drive circuit
B1613
Seat belt pre-tensioner
(passenger’s side) (squib ignition
drive circuit)
• Short circuit in the squib ignition drive circuit
B1614
• Open circuit in the squib ignition drive circuit
Code No.
Part/Circuit integral to SRS-
ECU
Trouble causes
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-109
Code No.B1410: Passenger's (front) air bag module (squib) system (short-circuited between
terminals of the squib circuit)
IND
AC805798
PASSENGER'S (FRONT)
AIR BAG MODULE
(SQUIB)
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
J/B
(FUSE )
PASSENGER'S
AIR BAG
CUT OFF
INDICATOR
CONNECTOR LOCK SWITCH
CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF
NOTE
:
Passenger's (Front) Air Bag Module (Squib) Circuit
PASSENGER'S AIR BAG
CUT OFF SWITCH
AC
SRS-ECU
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 SRS air
bag will inflate.
• The ignition signal is input to the air bag module
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.
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-110
PROBABLE CAUSES
• Improper engaged connector or defective short
spring*
• Short circuit between the passenger's (front) air
bag module (squib) circuit terminals
• Damaged connector(s)
• Malfunction of the passenger’s air bag cut off
switch
• 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 discon-
nected).Therefore, if connector C-02 or C-154 is
damaged or improperly engaged, the short spring
may not be released when the connector is con-
nected.
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.
STEP 2. Connector lock check: SRS-ECU
connector C-154. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.
AC801404
AJ
Connector: C-154
C-154 (Y)
Harness side
connector
(rear view)
(2) Disconnect the connectors C-154 and then
reconnect them.
(3) Connect the negative battery terminal.
(4) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code B1410 set?
YES :
Go to Step 3.
NO :
The procedure is complete. It is assumed
that diagnosis code B1410 set as connector
C-154 was engaged improperly.
STEP 3. Connector lock check: SRS-ECU
connector C-154 and passenger’s (front) air bag
module connector C-02. (M.U.T.-III diagnosis
code)
(1) Disconnect the negative battery terminal.
AC801404
AJ
Connector: C-154
C-154 (Y)
Harness side
connector
(rear view)
AC509788
C-02 (R)
AC
Glove box striker
2 1
Harness side
connector
(front view)
Lock
lever
Connector: C-02
(2) Disconnect connectors C-02 and C-154, and then
reconnect them. For connector C-02, pull up the
harness side lock lever with a nail and disconnect
the connector lock.
(3) Connect the negative battery terminal.
(4) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code B1410 set?
YES :
Go to Step 4.
NO :
The procedure is complete. It is assumed
that diagnosis code B1410 set as connector
C-02 or C-154 was engaged improperly.
STEP 4. Check the passenger’s air bag cut off
switch.
Check the passenger's air bag cut off switch (Refer
to
).
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace passenger’s air bag cut off switch
(Refer to
).
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