Mitsubishi Galant (2004+). Manual — part 1610
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-333
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
1. Connect scan tool MB991958 to the data link connector
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 check result satisfactory?
YES : 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
.)
NO : Replace the A/C-ECU. On completion, check that the
DTC is not reset.
TROUBLE SYMPTOM CHART
M1524003400495
CAUTION
During diagnosis, a DTC code associated with
another system may be set when the ignition
switch is turned on with connector(s) discon-
nected. After completing the repair, confirm all
systems for DTC code(s). If DTC code(s) are set,
erase them all.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SYMPTOM
INSPECTION PROCEDURE NO. REFERENCE PAGE
Communication between the scan tool and the
SRS-ECU is not possible.
1
Power supply circuit system
2
When the ignition key is turned to the "ON"
position (engine stopped), the SRS warning
light does not illuminate.
3
After the ignition key is turned to the "ON"
position, the SRS warning light does not go off
within approximately seven seconds.
4
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-334
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Communication between Scan Tool and the SRS-ECU is not possible.
.
IGNITION
SWITCH (IG1)
JUNCTION
BLOCK
SRS-ECU
POWER SUPPLY
DATA LINK
CONNECTOR
JOINT
CONNECTOR (3)
Data Link Connector Circuit
AC308123
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-335
TECHNICAL DESCRIPTION (COMMENT)
If the scan tool (MUT-III Sub Assembly) can not com-
municate with the SRS system, the CAN bus lines
may be defective. If the SRS system does not work,
the SRS-ECU or its power supply circuit may be
defective.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
• Damaged wiring harness or connector
• 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)
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.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
Q: Is the check result satisfactory?
YES : Check and repair the power supply circuit system
(Refer to
NO : Repair the CAN bus lines (Refer to GROUP 54C,
Diagnosis-Can Bus Diagnostic Chart
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-336
INSPECTION PROCEDURE 2: Power Supply Circuit System
IGNITION
SWITCH (IG1)
JUNCTION
BLOCK
SRS-ECU
IG1 Power Supply Circuit
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