Mitsubishi Galant 9G. Manual — part 1460

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-250

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) 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,

Diagnosis ).

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-251

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 B1530, B1531, B1532, B1533, B1534, B1535,

B1536, B1537, B1538, B1539, B1540, B1541, B1542,
B1543, B1545 or B1546 set?
YES : Carry out the troubleshooting of the passenger’s seat

belt switch system, the occupant classification-ECU
or the occupant classification sensor system (Refer to

P.52B-310

<B1530,B1531, B1532, B1533, B1534,

B1535, B1536, B1537, B1538 or B1539>,

P.52B-319

<B1540,B1541, B1542 or B1543> or

P.52B-321

<B1545 or B1546>).

NO : Go to Step 4.

STEP 4. Check the passenger’s seat belt warning light
connector C-07.
Q: Is the connector correctly engaged?

YES : Go to Step 5.
NO : Engage the connector correctly. Then go to Step 10.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305233CZ

CONNECTOR: C-07

HARNESS SIDE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-252

STEP 5. Measure the voltage at passenger’s seat belt
warning light connector C-07.
(1) Disconnect passenger’s seat belt warning light connector

C-07.

(2) Measure the voltage between C-07 harness side connector

terminal 1 and body ground.
Voltage should measure approximately 12 volt.

Q: Is the check result satisfactory?

YES : Go to Step 7.
NO : Go to Step 6.

STEP 6. Check the harness for short circuit between
ignition switch connector C-308 (terminal No.2) and
passenger’s seat belt warning light C-07 (terminal No.1).

AC305233CZ

CONNECTOR: C-07

HARNESS SIDE

AC308201

C-07 HARNESS SIDE
CONNECTOR

AB

AC305235AG

CONNECTOR: C-308

C-308

2
5

4

1

6

3

AC305233CZ

CONNECTOR: C-07

HARNESS SIDE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-253

NOTE: After inspecting intermediate connectors C-211 and
C-215 inspect the wiring harness. If intermediate connectors
C-211 and C-215 are damaged, repair or replace them. Refer
to GROUP 00E, Harness Connector Inspection . Then go to
Step 10.

Q: Are the harness wires between passenger’s seat belt

warning light connector C-07 (terminal No.1) and the
ignition switch connector C-308 (terminal No.2) in good
condition?
YES : Go to Step 7.
NO : Repair the harness wires. Then go to Step 10.

STEP 7. Check SRS-ECU connector C-121.
Q: Is the connector correctly engaged?

YES : Go to Step 8.
NO : Engage the connector correctly. Then go to Step 10.

AC305416

CONNECTORS: C-211, C-215

JUNCTION BLOCK
(FRONT VIEW)

C-215

C-211

HARNESS SIDE

C-211

HARNESS SIDE

C-215

AK

AC305233CZ

CONNECTOR: C-07

HARNESS SIDE