Mitsubishi Grandis. Manual — part 1008
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-84
STEP 4. Resistance measurement between the
SRS-ECU connector C-120 (terminal No.9 and 10)
and the side-airbag module (LH) connector D-22
(terminal No.1 and 2).
(1) Disconnect SRS-ECU connector C-120.
(2) Disconnect side-airbag module (LH) connector
D-22.
CAUTION
Do not insert a test probe into the terminal from
its front side directly, as the connector contact
pressure may be weakened.
(3) Check for continuity between the following
terminals.
• SRS-ECU connector C-120 (terminal No.9)
and the side-airbag module (LH) connector
D-22 (terminal No.1)
• SRS-ECU connector C-120 (terminal No.10)
and the side-airbag module (LH) connector
D-22 (terminal No.2)
OK: Less than 2
Ω
Q: Are the check results normal?
YES :
Go to Step 5.
NO :
Repair the harness wires between
SRS-ECU connector C-120 (terminal No.9
and 10) and side-airbag module (LH)
connector D-22 (terminal No.1 and 2).
STEP 5.Check whether the diagnosis code is
reset.
Q: Is diagnosis code B1431 set?
YES :
Replace the SRS-ECU (Refer to
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
).
AC311438 AE
C-120 (Y)
Connector: C-120
Harness side
(front view)
AC303521
AD
D-22 (R)
Connector: D-22
Harness side
(front view)
AC308176
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
1 2
C-120
Harness side
connector
(rear view)
D-22
Harness side
connector
(rear view)
AD
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-85
Code No.B1432: Side-Airbag Module (LH) (Squib) System Fault Earth Circuit (Short-Circuited to
Earth)
CAUTION
If diagnosis code B1432 is set in the combination
meter, always diagnose the CAN bus lines.
OPERATION
• The SRS-ECU judges how severe a collision is
by detecting signals from the left and right side
impact sensors. If the impact is over a
predetermined level, the SRS-ECU sends an
ignition signal. At this time, if the side-airbag
safing G-sensor is on, the SRS side-airbag will
inflate.
• The ignition signal is input to the side-airbag
module to inflate the side-airbag.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if there is abnormal
resistance between the input terminals of the
side-airbag module (LH) (squib).
PROBABLE CAUSES
• Damaged wiring harnesses or connectors
• Short to earth in the left hand side-airbag module
(squib) harness
• 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 lines (Refer to GROUP
54D, Diagnosis-Can Bus Diagnostic Chart
). .
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
SIDE AIR BAG
MODULE
(SQUIB) (LH)
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
: CONNECTOR
CONNECTED: ON
CONNECTOR
DISCONNECTED: OFF
NOTE
Side-Airbag Module (LH) (Squib) Circuit
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-86
STEP 3. Check the side-airbag module (LH).
(MUT-III diagnosis code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the side-airbag module (LH)
connector D-22.
(3) Connect special tool dummy resistor (MB991865)
to special tool resistor harness (MB991866).
CAUTION
Do not insert a test probe into the terminal from
its front side directly, as the connector contact
pressure may be weakened.
(4) Insert special tool MB991866 into the D-22
harness side connector by backprobing.
(5) Connect the negative battery terminal.
(6) Erase the diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code B1432 set?
YES :
Go to Step 4.
NO :
Replace the seatback frame of the front
seat (LH). (Refer to GROUP 52A, Front
Seat
).
STEP 4. Check the side-airbag module (LH)
circuit. Resistance measurement at the SRS-ECU
connector C-120.
(1) Disconnect SRS-ECU connector C-120.
(2) Disconnect side-airbag module (LH) connector
D-22
CAUTION
Do not insert a test probe into the terminal from
its front side directly, as the connector contact
pressure may be weakened.
(3) Check for continuity between C-120 harness side
connector terminals 9, 10 and body earth.
OK: Open circuit
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the harness wires between
SRS-ECU connector C-120 (terminal No.9
and 10) and side-airbag module (LH)
connector D-22 (terminal No.1 and 2).
AC303521
AD
D-22 (R)
Connector: D-22
Harness side
(front view)
AC006042 BY
MB991866
(Resistor harness)
D-22 Harness side
connector
D-22 Side-airbag
module (LH) connector
MB991865 (Dummy
resistor: 3
Ω)
AC311438 AE
C-120 (Y)
Connector: C-120
Harness side
(front view)
AC303521
AD
D-22 (R)
Connector: D-22
Harness side
(front view)
AC308178
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
C-120 Harness side
connector (rear view)
AD
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-87
STEP 5. Check whether the diagnosis code is
reset.
Q: Is diagnosis code B1432 set?
YES :
Replace the SRS-ECU (Refer to
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
).
diagnosis code B1433: Side-Airbag Module (LH) (Squib) System Fault Power Supply Circuit
(Short-Circuited to Power Supply)
CAUTION
If diagnosis code B1433 is set in the combination
meter, always diagnose the CAN bus lines.
OPERATION
• The SRS-ECU judges how severe a collision is
by detecting signals from the left and right side
impact sensors. If the impact is over a
predetermined level, the SRS-ECU sends an
ignition signal. At this time, if the side-airbag
safing G-sensor is on, the SRS side-airbag will
inflate.
• The ignition signal is input to the side-airbag
module to inflate the side-airbag.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if there is abnormal
resistance between the input terminals of the
side-airbag module (LH) (squib).
PROBABLE CAUSES
• Damaged wiring harnesses or connectors
• Short to the power supply in the side-airbag
module (LH) (squib) harness
• 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?
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
SIDE AIR BAG
MODULE
(SQUIB) (LH)
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
: CONNECTOR
CONNECTED: ON
CONNECTOR
DISCONNECTED: OFF
NOTE
Side-Airbag Module (LH) (Squib) Circuit
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