Mitsubishi Galant (2004+). Manual — part 1570
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-173
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC 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 side-airbag module (LH). (Using scan
tool MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the side-airbag module (LH) connector D-24.
(3) Connect special tool MB991865 to special tool 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-24 harness side
connector by backprobing.
(5) Connect the negative battery terminal.
(6) Erase the diagnostic trouble code memory, and check the
diagnostic trouble code.
Q: Is DTC B1433 set?
YES : Go to Step 4.
NO : Replace the seatback frame of the front seat (LH).
(Refer to GROUP 52A, Front Seat
go to Step 6.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC307778
CONNECTOR : D-24
AC
D-24 (R)
2
1
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC006042 BP
MB991866
(RESISTOR HARNESS)
D-24 HARNESS SIDE
CONNECTOR
D-24 SIDE-AIRBAG
MODULE (LH) CONNECTOR
MB991865 (DUMMY
RESISTOR: 3
Ω)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-174
STEP 4. Check the side-airbag module (LH) circuit.
Measure the resistance at the SRS-ECU connector C-122.
(1) Disconnect SRS-ECU connector C-122.
(2) Disconnect side-airbag module (LH) connector D-24.
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-122 harness side connector
terminals 9, 10 and body ground.
It should be open circuit.
Q: Does continuity exist?
YES : Erase the diagnostic trouble code from memory, and
check the diagnostic trouble code. If DTC B1433 sets,
replace the SRS-ECU. (Refer to
). Then go
to Step 6.
NO : Go to Step 5.
AC305362
CONNECTOR: C-122
C-122 (Y)
AI
SRS-ECU
C-122
Harness side
connector
(rear view)
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
AC307778
CONNECTOR : D-24
AC
D-24 (R)
2
1
HARNESS SIDE
CONNECTOR
(REAR 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-122 HARNESS SIDE
CONNECTOR
(REAR VIEW)
AB
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-175
STEP 5. Check the harness wires for short circuit to
ground between SRS-ECU connector C-122 (terminal No.9
and 10) and side-airbag module (LH) connector D-24
(terminal No.1 and 2).
Q: Are the harness wires between SRS-ECU connector
C-122 (terminal No.9 and 10) and side-airbag module
(LH) connector D-24 (terminal No.1 and 2) in good
condition?
YES : Go to Step 6.
NO : Replace the harness wires between SRS-ECU
connector C-122 and side-airbag module (LH)
connector D-24. Then go to Step 6.
STEP 6. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC B1433 set?
YES : Return to Step 1.
NO : The procedure is complete.
AC305362
CONNECTOR: C-122
C-122 (Y)
AI
SRS-ECU
C-122
Harness side
connector
(rear view)
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
AC307778
CONNECTOR : D-24
AC
D-24 (R)
2
1
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-176
DTC B1437: Side Impact Sensor (LH) Power Supply Circuit System
CAUTION
If DTC B1437 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
CIRCUIT OPERATION
The side impact sensor includes an analog G sensor
and CPU, etc. The CPU monitors the analog G sen-
sor output signal. If the CPU judges that the
side-airbags should be deployed, it sends a fire sig-
nal to the SRS-ECU to deploy the side-airbags. In
addition, the CPU diagnoses the internal compo-
nents of the side impact sensor. If a malfunction
occurs, it requests the SRS-ECU to set a diagnostic
trouble code.
.
DTC SET CONDITIONS
This DTC is set if the power supply voltage of the
side impact sensor (LH) drops below the rated value
for a continuous period of 5 seconds or more. How-
ever, DTC B1437 will be automatically cleared and
the SRS warning light will switch off if the condition
returns to normal.
.
TROUBLESHOOTING HINTS
• Damaged wiring harnesses or connectors
• Malfunction of the side-airbag module (LH)
(squib)
• Malfunction of the SRS-ECU
.
SIDE IMPACT
SENSOR (LH)
INTERFACE
CIRCUIT
SRS-ECU
Side Impact Sensor (LH) Circuit
AC305362
CONNECTOR: C-122
C-122 (Y)
AE
SRS-ECU
AC305250
CONNECTOR: D-21
AC
FRONT SEAT BELT
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