Mitsubishi Galant 9G. Manual — part 1405

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-30

TROUBLESHOOTING STRATEGY

M1524003100654

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted all of the possible ways to find a
SRS fault.
1. Gather information about the problem from the

customer.

2. Verify that the condition described by the

customer exists.

3. Check the vehicle for any SRS diagnostic trouble

codes (SRS DTC).

4. If you cannot verify the condition but there are no

SRS DTCs, the malfunction is intermittent. Refer
to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How

to Cope with Intermittent Malfunctions .

5. If there is a SRS DTC, record the code number,

then erase the code from vehicle memory using
scan tool (MUT-III Sub Assembly) MB991958.

6. Recreate the SRS DTC set conditions to see if the

same SRS DTC will be set again.

• If the same SRS DTC is set again, follow the

Inspection Chart for the DTC and find the fault.

• If you cannot get the same SRS DTC to be set

again, the malfunction is intermittent. Refer to
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points

− How to Cope with Intermit-

tent Malfunctions .

DIAGNOSTIC FUNCTION

M1524013800074

HOW TO CONNECT THE SCAN TOOL (MUT-III)

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)

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. Ensure that the ignition switch is at the "LOCK" (OFF)

position.

2. Start up the personal computer.

3. Connect special tool MB991827 to special tool MB991824

and the personal computer.

4. Connect special tool MB991910 to special tool MB991824.

5. Connect special tool MB991910 to the data link connector.

6. Turn the power switch of special tool MB991824 to the "ON"

position.

NOTE: When special tool MB991824 is energized, special
tool MB991824 indicator light will be illuminated in a green
color.

7. Start the MUT-III system on the personal computer.

NOTE: Disconnecting scan tool MB991958 is the reverse of the
connecting sequence, making sure that the ignition switch is at
the "LOCK" (OFF) position.

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-31

HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODES

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)

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.

NOTE: If the battery voltage is low, diagnostic trouble codes will
not be set. Check the battery if scan tool MB991958 does not
display.
1. Connect scan tool MB991958 to the data link connector.

2. Turn the ignition switch to the "ON" position.

3. Select "Interactive Diagnosis" from the start-up screen.

4. Select "System select."

5. Select "MITSUBISHI."

6. Choose "SRS-AIR BAG" from the "BODY" tab.

7. Select "Diagnostic Trouble Code."

8. If a DTC is set, it is shown.

9. Choose "Erase DTCs" to erase the DTC.

SRS WARNING LIGHT CHECK

M1524004300361

1. Check that the SRS warning light illuminates when the

ignition switch is in the "ON" position.

2. Check that it illuminates for approximately seven seconds

and then goes out.

3. If not, check for DTC.

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC307341

SRS WARNING LIGHT

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-32

PASSENGER'S SEAT BELT WARNING LIGHT
CHECK

M1524026200016

1. Check that the passenger’s seat belt warning light

illuminates when the ignition switch is in the "ON" position.

2. Check that it illuminates for approximately seven seconds

and then goes out.

3. If not, check for DTC.

PASSENGER'S AIR BAG OFF INDICATOR LIGHT
CHECK

M1524026300013

1. Check that the passenger’s air bag OFF indicator light

illuminates when the ignition switch is in the "ON" position.

2. Check that it illuminates for approximately seven seconds

and then goes out.

3. If not, check for DTC.

AC306329AC

PASSENGER'S
SEAT BELT
WARNING
LIGHT

AC306329AB

PASSENGER'S
AIR BAG OFF
INDICATOR
LIGHT

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-33

DIAGNOSTIC TROUBLE CODE CHART

M1524003300777

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.
Inspect according to the inspection chart that is
appropriate for the DTC.

DIAGNOSTIC
TROUBLE CODE
NO.

INSPECTION ITEM

REFERENCE PAGE

B1400

Driver's air bag (1st squib) short-circuited

P.52B-38

B1401

Driver's air bag (1st squib) open-circuited

P.52B-48

B1402

Driver's air bag (1st squib) drive circuit (ground side)
short-circuited

P.52B-55