Mitsubishi Galant (2004+). Manual - part 1610

 

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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

P.00-6

.)

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

P.52B-334

Power supply circuit system

2

P.52B-336

When the ignition key is turned to the "ON" 
position (engine stopped), the SRS warning 
light does not illuminate.

3

P.52B-341

After the ignition key is turned to the "ON" 
position, the SRS warning light does not go off 
within approximately seven seconds.

4

P.52B-341

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 

P.52B-336

).   

NO :  Repair the CAN bus lines (Refer to GROUP 54C, 

Diagnosis-Can Bus Diagnostic Chart 

P.54C-14

). 

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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