Mitsubishi Galant 9G. Manual — part 1415
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-70
STEP 7. 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 B1403 <1st squib> or B1483 <2nd squib> set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC B1406: Front Impact Sensor (RH) System for Fault 1 DTC B1416: Front Impact Sensor (LH)
System for Fault 1
CAUTION
If DTC B1406 or B1416 is set in the SRS-ECU,
always diagnose the CAN main bus line.
.
DTC SET CONDITIONS
These DTCs are set if the following conditions are
detected from the analog G-sensor inside the front
impact sensor output:
• Analog G-sensor is not operating.
• Analog G-sensor characteristics are abnormal.
• Analog G-sensor output is abnormal.
.
TROUBLESHOOTING HINTS
Malfunction of front impact sensor (RH) (for DTC
B1406) and front impact sensor (LH) (for DTC
B1416)
.
DIAGNOSIS
Required Special Tool:
• 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 (Vehicles with CAN
communication system)
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-71
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,
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 ).
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-72
STEP 3. Check the front impact sensor. (Using scan tool
MB991958, read the diagnostic trouble code.)
Replace front impact sensor (RH) and front impact sensor (LH)
(for DTC B1416) (Refer to
Check the diagnostic trouble code.
Q: Is either DTC B1406 or B1416 set?
YES : Replace the SRS-ECU (Refer to
).
NO : The procedure is complete.
DTC B1407: Front Impact Sensor (RH) Power Supply Circuit System
Front Impact Sensor Circuit
INTERFACE CIRCUIT
SRS-ECU
FRONT IMPACT
SENSOR (LH)
FRONT IMPACT
SENSOR (RH)
AC305206
A-27 (Y)
BC
CONNECTOR: A-27
AC305233CV
CONNECTOR: C-11
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-73
CAUTION
If DTC B1407 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
CIRCUIT OPERATION
The front 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 front air
bags should be deployed, it sends a fire signal to the
SRS-ECU to deploy the front air bags. In addition,
the CPU diagnoses the internal components of the
front impact sensor. If a malfunction occurs, it
requests the SRS-ECU to set a diagnostic trouble
code.
.
DTC SET CONDITIONS
This DTC will set when the power supply voltage to
the front impact sensor (RH) remains less than a pre-
determined value for five seconds. However, if the
system returns to normal condition, code number
B1407 will be erased automatically and the SRS
warning light will go out.
.
TROUBLESHOOTING HINTS
• Damaged wiring harness or connectors
• Malfunction of the front impact sensor (RH)
• Malfunction of the SRS-ECU
.
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 (Vehicles with CAN
communication system)
• MB991223 (MB991222): Harness set (Probe)
AC305233 AO
CONNECTOR: C-22
C-22 (Y)
AC305362
CONNECTOR: C-121
C-121 (Y)
AD
SRS-ECU
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