Mitsubishi Galant 9G. Manual — part 1441
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-174
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-175
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-air-
bags should be deployed, it sends a fire signal to the
SRS-ECU to deploy the side-airbags. In addition, the
CPU diagnoses the internal components 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 impact sensor (LH)
• Malfunction of the SRS-ECU
.
Side Impact Sensor (LH) Circuit
SIDE IMPACT
SENSOR (LH)
INTERFACE
CIRCUIT
SRS-ECU
AC305362
CONNECTOR: C-122
C-122 (Y)
AE
SRS-ECU
AC305250
CONNECTOR: D-20
AI
FRONT SEAT BELT
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-176
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
• MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
scan tool
."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-177
STEP 2. 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 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 Use Troubleshooting/Inspection
Service Points
− How to Cope with Intermittent
Malfunctions ).
STEP 3. Check the side impact sensor (LH) power supply
circuit. Measure the voltage at the side impact sensor (LH)
connector D-20.
(1) Disconnect the negative battery terminal.
(2) Disconnect side impact sensor (LH) connector D-20, 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 the D-20 harness side
connector terminal 2 and body ground.
Voltage should measure 9 volts or more.
Q: Is the measured voltage within the specified range?
YES : Replace the side impact sensor (LH) (Refer to
NO : Go to Step 4.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305250
CONNECTOR: D-20
AJ
FRONT SEAT BELT
HARNESS SIDE
CONNECTOR
(REAR VIEW)
2
1
AC201627
1 2
D-20 HARNESS SIDE
CONNECTOR
(REAR VIEW)
AU
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