Mitsubishi Grandis. Manual — part 1018
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-124
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
STEP 3. Check the curtain air bag module (RH).
(MUT-III diagnosis code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the intermediate connector G-22
(connection between rear floor harness and floor
harness).
(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 resistor harness probe into
floor harness side connector G-22 by
backprobing.
(5) Connect the negative battery terminal.
(6) Erase diagnosis code memory, and check the
diagnosis code.
Q: Is diagnosis code B1453 set?
YES :
Go to Step 4.
NO :
Go to Step 5.
STEP 4. Check the curtain air bag module circuit.
Voltage measurement at the SRS-ECU connector
C-120.
(1) Disconnect the negative battery terminal.
(2) Disconnect SRS-ECU connector C-120.
(3) Turn the ignition switch to the "ON" position.
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(4) Voltage measurement between C-120 harness
side connector terminals 5, 6 and body earth.
OK: 0 V
Q: Is the measured voltage within the specified
range?
YES :
Go to Step 6.
NO :
Repair the harness wire between SRS-ECU
connector C-120 (terminal No.5 and 6) and
intermediate connector G-22 (floor harness
side, terminal No.1 and 2).
AC302576AE
G-22 (R)
Connector: G-22
Floor harness
side (front view)
Third seat
belt (LH)
Second seat
belt (LH)
2 1
AC006042CA
MB991866
(Resistor harness)
G-22 Floor harness
connector
G-22 Rear floor
harness connector
MB991865
(Dummy resistor : 3
ΩΩ
AC311438 AE
C-120 (Y)
Connector: C-120
Harness side
(front view)
AC301564
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
AC
C-120
Harness side connector
(rear view)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-125
STEP 5. Check the curtain air bag module circuit.
Voltage measurement at the intermediate
connector G-22.
(1) Disconnect the negative battery terminal.
(2) Disconnect the intermediate connector G-22
(connection between rear floor harness and floor
harness).
(3) Turn the ignition switch to the "ON" position.
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(4) Voltage measurement between G-22 harness
side connector terminals 1, 2 and body earth.
OK: 0 V
Q: Is the measured voltage within the specified
range?
YES :
Replace the curtain air bag module (LH)
(Refer to
).
NO :
Repair the harness wire between
intermediate connector G-22 (terminal No.1
and 2) and curtain air bag module (LH)
connector G-01 (terminal No.1 and 2).
STEP 6. Check whether the diagnosis code is
reset.
Q: Is diagnosis code B1453 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
).
AC302576AE
G-22 (R)
Connector: G-22
Floor harness
side (front view)
Third seat
belt (LH)
Second seat
belt (LH)
2 1
AC303709
2
1
G-22 Rear floor harness
connector (rear view)
AC
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-126
Code No.B1457: Side Impact Sensor (Rear) (LH) Power Supply Circuit System
CAUTION
If diagnosis code B1447 is set in the SRS-ECU,
always diagnose the CAN main bus line.
OPERATION
The side impact sensor (Rear) includes an analogue
G sensor and CPU, etc. The CPU monitors the
analogue G sensor output signal. If the CPU judges
that the curtain air bags should be deployed, it sends
a fire signal to the SRS-ECU to deploy the curtain air
bags. In addition, the CPU diagnoses the internal
components of the side impact sensor (Rear). If a
malfunction occurs, it requests the SRS-ECU to set a
diagnosis code.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will set when the power supply
voltage to the side impact sensor (Rear) (RH)
remains less than a predetermined value for five
seconds. However, if the system returns to normal
condition, code number B1457 will be erased
automatically and the SRS warning lamp will go out.
PROBABLE CAUSES
• Damaged wiring harness or connectors
• Malfunction of the side impact sensor (Rear) (LH)
• 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
SIDE IMPACT
SENSOR (REAR: LH)
SRS-ECU
Side Impact Sensor (Rear) (LH) Circuit
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-127
STEP 3. Check the side impact sensor (Rear) (LH)
power supply circuit. Voltage measurement at the
side impact sensor (Rear) (LH) connector D-12.
(1) Disconnect the negative battery terminal.
(2) Disconnect side impact sensor (Rear) (LH)
connector D-12, and measure at the wiring
harness side.
(3) Connect the negative battery terminal.
(4) Turn the ignition switch to the "ON" position.
CAUTION
Do not insert a test probe into the terminal from
its front side directly, as the connector contact
pressure may be weakened.
(5) Measure the voltage between D-12 harness side
connector terminal 1 and body earth.
OK: 9 V or more
Q: Is the check result normal?
YES :
Replace the side impact sensor (Rear) (LH).
(Refer to
NO :
Go to Step 4.
STEP 4. Check the harness wires for open circuit
or short circuit between SRS-ECU connector
C-120 (terminal No.15 and 16) and side impact
sensor (Rear) (LH) connector D-12 (terminal No.1
and 2).
Q: Are the harness wires between SRS-ECU
connector C-120 (terminal No.15 and 16) and side
impact sensor (Rear) (LH) connector D-12 (terminal
No.1 and 2) in good condition?
YES :
Go to Step 5.
NO :
Replace the harness wires between
SRS-ECU connector C-120 (terminal No.15
and 16) and side impact sensor (Rear) (LH)
connector D-12 (terminal No.1 and 2).
STEP 5. Check whether the diagnosis code is
reset.
Q: Is diagnosis code B1457 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
).
AC311614 AD
D-12 (Y)
Connector: D-12
Harness side
(front view)
AC311097
D-12 Harness side
connector
(rear view)
AJ
AC311438 AE
C-120 (Y)
Connector: C-120
Harness side
(front view)
AC311614 AD
D-12 (Y)
Connector: D-12
Harness side
(front view)
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