Mitsubishi Galant (2004+). Manual - part 1565

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-153

STEP 4. Check the harness wires for open circuit or short
circuit between SRS-ECU connector C-120 (terminal No.63
and 64) and side impact sensor (RH) connector D-35
(terminal No.1 and 2).

Q: Are the harness wires between SRS-ECU connector

C-120 (terminal No.63 and 64) and side impact sensor
(RH) connector D-35 (terminal No.1 and 2) in good
condition?
YES : Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC B1428 or B1429
sets, replace the SRS-ECU. (Refer to

P.52B-365

Then go to Step 5.

NO : Replace the harness wires between SRS-ECU

connector C-120 and side impact sensor (RH)
connector D-35. Then go to Step 5.

STEP 5. 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 B1428 or B1429 set?

YES : Return to Step 1.
NO : The procedure is complete.

AC305362

CONNECTOR: C-120

C-120 (Y)

SRS-ECU

56 57

52 B

C-120
Harness side
connector
(rear view)

AC308163

CONNECTOR: D-35

FRONT SEAT BELT

HARNESS SIDE
CONNECTOR
(REAR VIEW)

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-154

DTC B1430: Side-Airbag Module (LH) (Squib) System Fault 1 (Short Circuit between Terminals of the
Squib Circuit)

CAUTION

If DTC B1430 is set in the combination meter,
always diagnose the CAN bus lines.

CIRCUIT OPERATION

• The SRS-ECU judges how severe a collision is

by detecting signals from the left and right side
impact sensors. If the impact is over a predeter-
mined level, the SRS-ECU sends an ignition sig-
nal. At this time, if the side-airbag safing
G-sensor is on, the SRS side-airbag will inflate.

• The ignition signal is input to the side-airbag

module to inflate the side-airbag.

DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the side-airbag mod-
ule (LH) (squib).

TROUBLESHOOTING HINTS

• Improper engaged connector or defective short

spring*

• Short circuit between the side-airbag module

(LH) (squib) circuit terminals

• Damaged connector(s)

• Malfunction of the SRS-ECU

SIDE AIR BAG
MODULE
(SQUIB) (LH)

AIR BAG DRIVE CIRCUIT

SRS-ECU

CONNECTOR
LOCK SWITCH

Side-Airbag Module (LH) (Squib) Circuit

NOTE
: CONNECTOR
CONNECTED
: ON
CONNECTOR
DISCONNECTED
: OFF

AC305362

CONNECTOR: C-122

C-122 (Y)

SRS-ECU

AC307778

CONNECTOR : D-24

D-24 (R)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-155

NOTE: *: The squib circuit connectors integrate a
"short" spring (which prevents the air bag from
deploying unintentionally due to static electricity by
shorting the positive wire to the ground wire in the
squib circuit when the connectors are disconnected).
(Refer to

P.52B-3

). Therefore, if connector C-122 or

D-24 is damaged or improperly engaged, the short
spring may not be released when the connector is
connected.

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)

• MB991865: Dummy resistor

• MB991866: Resister harness

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

P.52B-30

(2) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to "ON" position.
(4) Diagnose the CAN bus line.
Q: Is the check result satisfactory?

YES : Go to Step 2
NO : Repair the CAN bus lines (Refer to GROUP 54C,

Diagnosis-Can Bus Diagnostic Chart

P.54C-14

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-156

STEP 2. Recheck for diagnostic trouble code.

Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "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 Cope with Intermittent
Malfunction

P.00-6

STEP 3. Using scan tool MB991958, read the diagnostic
trouble code.

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) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.

(3) Turn the ignition switch to the "LOOK (OFF)" position.
Q: Is DTC B1519 set?

YES : Go to Step 4.
NO : Go to Step 5.

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

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