Mitsubishi Grandis. Manual — part 1011
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-96
STEP 6. Check the curtain air bag module (RH).
(MUT-III diagnosis code)
(1) Disconnect the negative battery terminal.
(2) Disconnect curtain air bag module (RH)
connector G-04. Use a flat-tipped screwdriver to
unlock the locking button at the harness side
connector by withdrawing it toward you in two
stages, and then disconnect the connector.
(3) Connect special tool dummy resistor (MB991865)
to special tool resistor harness (MB991884).
(4) Connect special tool MB991884 to the G-04
harness side connector.
(5) Connect the negative battery terminal.
(6) Erase diagnosis code memory, and then check
the diagnosis code.
Q: Is diagnosis code B1440 set?
YES :
Go to Step 7.
NO :
Replace the curtain air bag module (RH)
(Refer to
).
STEP 7. Check the curtain air bag module (RH)
circuit. Resistance measurement at the SRS-ECU
connector C-118
(1) Disconnect SRS-ECU connector C-118.
DANGER
To prevents the air bag from deploying
unintentionally, disconnect the curtain air
bag module (RH) connector G-04 to short the
squib circuit.
(2) Disconnect curtain air bag module (RH)
connector G-04. Use a flat-tipped screwdriver to
unlock the locking button at the harness side
connector by withdrawing it toward you in two
AC302575AD
G-04 (B)
Connector: G-04
Harness side
(front view)
Roof centre duct
AC208384AM
G-04
Curtain air bag
module connector
Flat-tip screw
driver
Locking button
G-04
Harness side
connector
AC301553AI
MB991865
(Dummy resistor : 3
ΩΩ
MB991884
(Resistor
harness)
G-04 Harness side connector
AC311438 AC
C-118 (Y)
Connector: C-118
Harness side
(front view)
AC302575AD
G-04 (B)
Connector: G-04
Harness side
(front view)
Roof centre duct
AC208384AM
G-04
Curtain air bag
module connector
Flat-tip screw
driver
Locking button
G-04
Harness side
connector
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-97
stages, and then disconnect the connector.
CAUTION
Insert an insulator such as a cable tie to a depth
of 4mm or more, otherwise the short bar will not
be released.
(3) Insert a cable tie [3 mm wide, 0.5 mm thick]
between terminals 61, 62 and the short bar to
release the short spring.
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(4) Resistance measurement between C-118
harness side connector terminals 61 and 62.
OK: Open circuit
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the harness wire between SRS-ECU
connector C-118 (terminal No.61and 62)
and curtain air bag module (RH) connector
G-04 (terminal No.1 and 2).
STEP 8. Check whether the diagnosis code is
reset.
Q: Is diagnosis code B1440 set?
YES :
Replace the SRS-ECU. (Refer
to
NO :
The procedure is complete. If no
malfunctions are found in all steps, an
intermittent malfunction is suspected (Refer
to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
).
AC301609
Section
A - A
C-118
Harness side connector
(front view)
Cable tie
Short spring
4 mm or more
Terminal
A
A
AC
AC301571
63
55
51
69
61
66
58
65
64
56 57
68
60
67
59
70
62
53
52 B
A
54
C-118
Harness side connector
(rear view)
AC
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-98
Code No.B1441: Curtain air bag module (squib) (RH) system (open-circuited in the squib circuit)
CAUTION
If diagnosis code B1441 is set in the SRS-ECU,
always diagnose the CAN main bus line.
OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the side impact sensors and
the side air bag safing G-sensor. If the impact is over
a predetermined level, the SRS-ECU outputs an
ignition signal. At this time, if the side air bag safing
G-sensor is on, the curtain air bag module will
deploy.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if curtain air bag module
squib (RH) wire(s) are open-circuited. However, if no
diagnosis code resets, the SRS warning lamp will be
switched off (diagnosis code will be retained).
PROBABLE CAUSES
• Improper connector contact
• Open circuit in the curtain air bag module (squib)
(RH) circuit
• Malfunction of the SRS-ECU
DIAGNOSIS PROCEDURE
STEP 1. MUT-III CAN bus diagnostics
Use the MUT-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus line (Refer to GROUP
54D, Diagnosis
STEP 2. Check whether the diagnosis code is
reset.
Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition: LOCK (OFF) position to ON
(3) On completion, check that the diagnosis code is
not reset.
Q: Is the diagnosis code set?
YES :
Go to Step 3.
NO :
There is an intermittent malfunction such as
poor engaged connector(s) or open circuit
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction
).
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
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
: CONNECTOR
CONNECTED: ON
CONNECTOR
DISCONNECTED: OFF
NOTE
CURTAIN AIR BAG
MODULE
(SQUIB) (RH)
Curtain Air Bag Module (Squib) (RH) Circuit
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-99
STEP 3. Check the curtain air bag module (RH).
(MUT-III diagnosis code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect curtain air bag module (RH)
connector G-04. Use a flat-tipped screwdriver to
unlock the locking button at the harness side
connector by withdrawing it toward you in two
stages, and then disconnect the connector.
(3) Connect special tool dummy resistor (MB991865)
to special tool resistor harness (MB991884).
(4) Connect special tool MB991884 to the G-04
harness side connector.
(5) Connect the negative battery terminal.
(6) Erase diagnosis code memory, and then check
the diagnosis code.
Q: Is diagnosis code B1441 set?
YES :
Go to Step 4.
NO :
Replace the curtain air bag module (RH)
(Refer to
).
STEP 4. Resistance measurement between
SRS-ECU connector C-118 (terminal No.61 and
62) and the curtain air bag module (RH)
connector G-04 (terminal No.1 and 2)
(1) Disconnect SRS-ECU connector C-118 and
curtain air bag module (RH) connector G-04, and
measure at the wiring harness side. For
connector G-04, use a flat-tipped screwdriver to
unlock the locking button at the harness side
connector by withdrawing it toward you in two
AC302575AD
G-04 (B)
Connector: G-04
Harness side
(front view)
Roof centre duct
AC208384AM
G-04
Curtain air bag
module connector
Flat-tip screw
driver
Locking button
G-04
Harness side
connector
AC301553AI
MB991865
(Dummy resistor : 3
ΩΩ
MB991884
(Resistor
harness)
G-04 Harness side connector
AC311438 AC
C-118 (Y)
Connector: C-118
Harness side
(front view)
AC302575AD
G-04 (B)
Connector: G-04
Harness side
(front view)
Roof centre duct
AC208384AM
G-04
Curtain air bag
module connector
Flat-tip screw
driver
Locking button
G-04
Harness side
connector
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